Consumer Guide to the 10 Best Diet Pills 2019

Consumer Guide to the 10 Best Diet Pills 2019

Buying diet pills can be a confusing process, but we are here to help. The aim of this website is to help you find the best diet pill for your needs. We review all of the popular weight loss supplements that are around at the moment, asking the important questions such as: Does it work? Is it safe for me to take? And will I get my money back if things go wrong?
With a dedicated team of full-time writers, researchers and consumer experts, we uncover all the secrets around diet pills, including the facts that the manufacturers and marketers don’t want you to know about.
We check out the good, the bad, and the illegal, so you can be confident that when you buy a supplement you know exactly what you are putting into your body. We also uncover the scams that are sadly a part of the modern day supplements industry.


  • 10 Best Products We’ve Seen
    • Phentaslim/Phentatrim
    • Hourglass Fat Burner
    • MyProtein Thermopure
    • Boombod 7 Day Achiever
    • Evolution Green Coffee Extract
    • Thermaxin
    • Forza T5 Super Strength
    • African Mango Advanced
    • PhenQ
    • Astral Nutrition Overpwr
  • Type of Diet Pills
    • Fat Burners
    • Fat Binders and Fat Blockers
    • Appetite Suppressants
    • Carb Blockers
    • Dual Action Pills
    • Metabolism Boosters
  • FAQs
  • In Summary
  • Further Reading
We understand how hard it can be for the consumer to get to the truth about diet pills, which is why we are here to guide you through it.
To do this, we use a star rating system to assess how good (or bad) a product is. To help us make our decision we follow a strict criteria based on key principles, such as the effectiveness of the diet pill, safety, price, guarantee, and trustworthiness of the seller.
It’s important to note that all our reviews are 100% independent and unbiased. We do earn a small commission from the products that we recommend, but this is essential for the smooth running of the website – and so we can keep the lights on. Rest assured that we would never approve a product that we feel is dangerous or useless in any way.

All good diet pills should conform to the following key points:

  • Reputable manufacturer that adheres to good manufacturing practice
  • Country of origin clearly marked
  • The supplement must work as claimed by the advertising
  • Contains only safe ingredients that have been tested
  • Does not cause dangerous or toxic side effects

  • Money-back guarantee for dissatisfied customers
  • Has genuine reviews from consumers
  • Clear instructions on how to take
  • Clear labelling showing the full ingredients list
  • Reputable sales policy – no dodgy strings attached or auto-billing scams
Not many supplements conform to our exacting criteria, but every now and then we find a gem of a diet pill that ticks all, or most, of these boxes.
It should also be noted that all supplements are different, so there are certain products that may not suit some customers, but may be very effective for others. Our job is simply to provide you with the information you need so that you can decide on what is best for you.
So now you know what we look for in a diet supplement, let’s take a look at some products we like.

10 Best Products we’ve seen so far


Phentaslim / Phentatrim

Phentaslim and Phentatrim
What we like
  • Over 100,000 customers
  • Active ingredients are in the correct, optimum doses
  • Active ingredients have significant clinical support
  • Save money on multi-bottle purchases
  • 60-day money-back guarantee
What we don’t like
  • Phentaslim not suitable if you’re sensitive to caffeine
Our number one spot is actually a double-header, as our two favourite products are from the same company (Optimum Nutra) and can be taken together to boost your weight-loss results even further. We’ll take you through them one at a time though, so you can see if either (or both) of them are the sort of product you’re looking for.


Phentaslim is a thermogenic weight loss supplement that boosts the metabolism for easier fat loss. It also provides extra benefits such as decreased hunger cravings, increased energy levels, and improved mental performance. Very much an all-rounder that gets results.
Phentaslim contains some fantastic ingredients. Green tea is rich in antioxidants and research has shown that when combined with caffeine, as it is here, it increases thermogenesis and fat oxidation in the body. The caffeine content of 190mg per serving is roughly the same as two cups of coffee, so you can expect a healthy energy boost to fire you up.
It also contains some useful amino acids, and vitamins and minerals for improving overall health and vitality levels. Other herbal ingredients are aimed at improving mood and energy, such as Panax ginseng that helps the body manage stress and improves wellbeing. All servings are in safe but effective quantities that compare well to vitamin supplements.
The ingredients have proven clinical research supporting them that is referenced on the official website, and the ingredient information is clearly listed, both on the bottle and online. Optimum Nutra have clearly done their homework and found an effective formula.
Side effects are not an issue for most users. Unless you are sensitive to caffeine, this is a really safe product to take.


While Phentaslim is more of a traditional fat burner, Phentatrim is an appetite suppressant. So this one will suit you if you are trying to reduce your calorie intake, stay on a diet, or simply avoid cravings.
The principal ingredient is a natural fibre called glucomannan, which is approved by health authorities (including EFSA) as being safe and effective. It has undergone multiple clinical tests and is clinically proven to work.
Glucomannan is extremely absorbent. When ingested it swells in the stomach, leaving you feeling fuller, slowing down digestion, and keeping hunger pangs at bay. It can also help maintain stable sugar levels and reduce cholesterol.
The proven dose for glucomannan to effectively suppress the appetite is 3000mg per day, which is the exact amount included in Phentatrim. So once again, Optimum Nutra have done the necessary research and created a product based around the optimum levels of strong ingredients.
Also included here are safe levels of chromium and iodine, which will support blood sugar maintenance and the metabolism.
Another little bonus: Phentatrim is stimulant-free, which makes it completely safe to take alongside Phentaslim, as you won’t be over-doing the caffeine content.
Both of these supplements are on sale solely via the official Optimum Nutra website, and the company offer a 60-day money-back guarantee on all products – this is a huge plus and a great sign that they are confident their product works.
Customer feedback for Phentaslim and Phentatrim is very good too. According to Optimum Nutra, thousands of customers have used these supplements and opinion is overwhelmingly positive. Results from independent review sites confirm this, with high ratings from customers and reviewers.
The price won’t break the bank either, particularly if you opt for a multi-bottle order – the more you buy, the more you save. You can mix and match as well, you don’t have to stick to just one of the products for the deals to apply. For both Phentaslim and Phentatrim the prices are:
  • 1 bottle of 90 capsules (30-day supply) costs £39 (45€/$59)
  • 3 month’s supply (buy two get one free) costs £77 (87€/$99)
  • 5 month’s supply (buy three get two bottles free) costs £117 (87€/$99)
Shipping is free worldwide too, which is a real bonus. The Optimum Nutra website is safe to buy from and there is a 60-day money-back guarantee.
These two are definitely our pick of the bunch. They both work as standalone products, but you can combine them to fight fat on two fronts. Phentaslim will get your body burning the weight off, Phentatrim will keep your food cravings in check.


Hourglass Fat Burner
What we like
  • Very impressive and detailed website
  • All natural ingredients
  • Money-back guarantee
  • Contains effective fat burning ingredients
What we don’t like
  • Glucomannan quantity is low – would have to double the dose to be effective
As the name suggests, the claim behind Hourglass Fat Burner is that is will help women get an “hourglass figure”. It is particularly aimed at athletes, bodybuilders and women who work out. It contains vitamins, herbal extracts and the appetite suppressant glucomannan.
Hourglass comes from Propura, a supplements company, based both in the UK and the USA, that offers a “science driven pathway to health and longevity”. All supplements are manufactured in a GMP-approved facility, and the overall impression is of safety and good quality.
The main ingredient is glucomannan, a proven appetite suppressant, and there is also green tea and natural extract guarana – which contain natural caffeine and are an effective pairing for increasing the metabolism.
Hourglass contains concentrates the capsicum extract Capsimax as well, which has a thermogenic effect. The additional contents include B vitamins, vitamin D, and chromium for helping the body regulate glucose. Finally, there is black pepper extract Bioperine, which enhances the absorption of the other ingredients.
The serving sizes look pretty generous, so it should be effective. However, the 1500mg glucomannan content is only set at half the approved serving of 3000mg a day. That said, suppressing the appetite is only part of the function of Hourglass (it’s predominantly a fat burner). At this serving size it may help slightly reduce cravings, which will be enough for some sportswomen. Alternatively, you could double up on the serving size, but this would obviously increase the cost.
There is not much in the way of independent customer feedback yet, but there is a money-back guarantee that is valid for 90 days, so you are able to claim a refund if things don’t work out.
Hourglass costs £30.00 ($50) for a month’s supply of 90 capsules. Two month’s supply costs £60 ($100). And a three bottles (3-month supply) comes with a free bottle and costs £90 or $150.
Shipping is free worldwide and sent from either the USA or the UK, depending on which is closest to you. If you are dissatisfied with the supplement you return the product to the same location.
We like that this product has the full ingredients information listed and that the supplement is aimed at boosting general health as well as the metabolism. An overall brilliant product.


MyProtein Thermopure
What we like
  • Cheap compared to other products
  • MyProtein is a reputable brand
  • Good for boosting the performance of those with active lifestyles
What we don’t like
  • No money-back guarantee
  • Not as effective for those who don’t already work out and exercise frequently
Unlike the products mentioned above, Thermopure isn’t a fat burner or an appetite suppressant, it actually aims to boost exercise performance and energy levels. Even though the advertising does not make any actual weight loss claims, it looks like it offers some great support to fitness goals with few side effects.
Thermopure comes under the MyProtein label. This is a sports nutrition brand from an award winning UK company called THG (The Hut Group) based in Manchester, UK. THG is a major company that operates worldwide, and MyProtein is a well-established and respected name in the bodybuilding and fitness communities.
The blend of ingredients is optimised for increasing energy and the metabolism – and it certainly seems effective in this way. If you regularly exercise you should notice improvements in your workout sessions.
Ingredients include green tea, caffeine, and cayenne pepper – all known for their thermogenic effects. The serving sizes are ample, with 375mg of green tea and 150mg of caffeine per serving (the equivalent of just less than two cups of instant coffee).
The other ingredient servings are equally significant and include L theanine, an amino acid in tea that causes energising yet calming effects, various vitamins, and the mineral chromium. There is also the amino acid L tyrosine, which can enhance energy levels, and finally, black pepper extract, which helps the body absorb the other ingredients.
The overall ingredients profile looks effective, although if you are used to taking strong fat burners and metabolism boosters that are stronger in stimulants, you might feel that this one is a little milder.
Customer opinion is largely positive. Although there are some negative comments, these are outweighed by the many positive reviews. Most people have found that this supplement increases energy, and some people mention associated weight loss when using Thermopure. Reported side effects are mainly related to caffeine sensitivity.
You can buy Thermopure directly from the MyProtein website. The good news for customers is that it is not expensive. A bottle of 90 capsules (1 month’s supply of 30 servings) costs just £9.99. If you don’t take the full 3-capsule dose each day this is enough for a 45-day supply. Shipping costs are applied at the point of sale, with UK shipping an added £3.99.
MyProtein often have discount codes available, as well as plenty of offers across their extensive range of products.
There is no money-back guarantee with Thermopure, but the price is so good that we think it’s certainly worth a shot for anybody who wants to boost their workouts.

Boombod 7 Day Achiever

Boombod 7 Day Achiever
What we like
  • Delivered in post-box-friendly packaging
  • Contains glucomannan, a recognized weight loss ingredient
  • Does not cause bloating
What we don’t like
  • No money-back guarantee
  • Expensive if not on offer
  • Clearer directions are needed
A slightly different product this one. Boombod 7-Day Achiever is a powder that you add to a small glass of water and drink as a shot three times a day. It contains glucomannan, plus vitamins and minerals for a boost to health and energy levels.
As well as being available online, Boombod have got their products into Holland & Barrett, so you can actually buy it in-store if you are in the UK. Customers outside the UK can only buy directly from the Boombod website at present. It is delivered in post-box friendly packaging for added convenience.
Boombod 7-Day Achiever claims to help you lose a noticeable amount of weight in just seven days. The supplement is sold as sachets containing glucomannan as the primary ingredient. This natural fibre is effective as an appetite suppressant and has been approved by health authorities, including EFSA (European Food Standards Agency).
Each shot contains the recommended serving size of 1 gram of glucomannan, plus vitamins and minerals. You drink it three times a day, before meals, and the sachets are marked for morning use, lunchtime, and nighttime. Each has slightly different ingredients that are deemed suitable for the time you take it.
Although you are instructed to drink Boombod like a shot, it is very important to follow this up by immediately drinking a large glass of water. Glucomannan is an extremely safe ingredient, but because it works by expanding in your stomach it is crucial to wash it down properly, otherwise it could pose a choking risk.
This instruction is not really made clear enough and is a slight mark against what is otherwise a good looking supplement. The other ingredients are an impressive blend of vitamins and minerals to help you through morning, noon and night.
Boombod is unlikely to cause side effects, but it may increase bowel movements or cause mild gastric discomfort for some users.
Feedback is generally positive on the official website and also on the Boombod Facebook page.
Although Boombod costs £29.99 for one week’s supply, you can sometimes pick up a 2-for-1 offer from the official website and from Holland & Barrett.
This is an incredibly original product and a very good supplement that will help with weight loss.

Evolution Slimming Green Coffee

Evolution Slimming Green Coffee Pure
What we like
  • Clinical study showed 5.7% weight loss in 2 months
  • Minimal side effects, unless you’re sensitive to caffeine
  • Cost effective supplement
  • 30-day money-back guarantee (from Evolution Slimming)
What we don’t like
  • Relies on caffeine – won’t suit everyone
Evolution Slimming Green Coffee is a straightforward and inexpensive supplement that contains just one ingredient. Evidence suggests that green coffee bean extract has numerous benefits for health and weight loss, it looks like a safe way to support any weight loss plan.
Evolution Slimming is a British company based in Kent. Their supplements can be purchased directly from the official website or via third party sites, such as Amazon.
Evolution Slimming Green Coffee contains only one ingredient: green coffee bean extract. But as single ingredients go, this isn’t a bad choice – it can boost metabolism without causing the jitteriness associated with other stimulants, and has minimal, if any, associated side effects.
The extract is in a powerful form of 10:1 strength, which means that each 200mg capsule is the equivalent of 2000mg of pure green coffee extract per serving. As you take three pills per day, this delivers the equivalent of 6000mg of green coffee bean extract – so it’s pretty strong compared to other green coffee supplements on the market.
Green coffee bean extract is formulated from unroasted coffee beans. This means it retains high levels of chlorogenic acid, which, in combination with the natural caffeine contained in the coffee, increases the speed of the metabolism. Green coffee is also rich in antioxidants, so it has a general health-boosting effect too.
More good news: Evolution Green Coffee is covered by a 30-day money-back guarantee, so you can get your money back if you are dissatisfied.
One month’s supply of 90 capsules costs £19.99 and there are savings on multiple orders. Prices are available in local currencies, including Euros and USD, and the company ships worldwide for very little cost.
Overall we think this is a top quality supplement that is worth a try if you are looking for a boost to your weight loss plan.


Astral Nutrition Thermaxin
What we like
  • Contains some good ingredients
  • Reputable looking company – safe to buy from
  • Money-back guarantee
What we don’t like about Thermaxin
  • Confusion over the caffeine content contained in this supplement
  • No details regarding manufacture
Another fat burner on our list, Thermaxin was made to be used alongside an exercise program. It contains a blend of eight ingredients, including caffeine, green tea and green coffee bean extract. It seems to be the most popular product in the Astral Nutrition range.
Thermaxin is designed to increase the speed of the metabolism, burn fat and improve energy levels. The ingredients profile looks effective – it contains green tea extract and caffeine, which can improve the results of resistance training, as well as help with fat loss.
There is also green coffee bean extract, which is high in chlorogenic acid and antioxidants and can improve fat burning. Cayenne pepper may add to the thermogenic effect as well, and amino acid L tyrosine can improve alertness.
This supplement looks to be pretty effective. There is quite a lot of caffeine, so it will have a stimulant effect, and although the listed caffeine level is 150mg (just under 2 cups of coffee), the green coffee bean extract and green tea will add to this figure. So do be aware of the high caffeine content.
You can buy Thermaxin directly from the official Astra Nutrition website. It costs £29.95 for a bottle of 60 capsules (one month’s supply). Shipping costs are applied at the point of sale, but it is unclear whether Thermaxin is available to customers outside the UK.
All of their products are covered by a 30-day money-back guarantee, and if you go to the Astral Nutrition Facebook page you can obtain a discount code for 10% off.
Thermaxin appears popular with customers, who have generally posted good feedback on the website and on Facebook. There’s clearly lots to love, and we can see that Thermaxin works for the people who have already tried it.

Forza T5 Super Strength

Forza T5 Super Strength
What we like about Forza T5
  • Company refunds delivery cost as well as cost of supplement
  • Clinical support for ingredients
  • Will boost energy levels
What we don’t like about Forza T5
  • Standard money-back guarantee
  • High in caffeine
Another one for the fitness fans, Forza T5 Super Strength is a pre-workout supplement for boosting your energy levels and enhancing exercise performance.
The product used to contain a stimulant called Citrus aurentium (also known as bitter orange extract), but this has since been dropped for safety reasons.
Forza T5 Super Strength is an energy-boosting pre-workout supplement that is suitable for both men and women. The idea is that it will provide an edge to your performance, increasing mental alertness and physical performance.
Ingredients include a high serving of caffeine (300mg), which is roughly the equivalent of three cups of coffee. There is also green tea (again in a high serving), and this combination can lead to increased fat burning and improved exercise performance.
The supplement also contains a blend of vitamins and minerals, the amino acid acetyl carnitine, which may improve mental functioning, plus the herbal extracts cayenne pepper and Panax ginseng.
Stimulant side effects could be an issue for some users. Although Forza T5 Super Strength no longer contains Citrus aurentium, the caffeine serving is high. The recommended upper limit of caffeine is 400mg a day, about four cups of coffee, so this supplement will not suit you if you are sensitive to caffeine or continue to drink coffee or tea in high quantities.
A real plus point for Forza T5 Super Strength is that it is very inexpensive if you buy directly from the official website. A bottle of 60 capsules (one month’s serving) costs just £14.00. UK shipping is an additional £3.50, and international delivery is available.
A money-back guarantee is not offered beyond a standard returns policy (which includes free return shipping), but the low price does lessen the risk considerably.
Overall, we think that Forza T5 Super Strength looks very reasonable and will suit many users who are looking to boost their workouts.
The principal ingredients – green tea and caffeine, are well known for increasing the metabolism and helping weight loss. The other ingredients help support weight loss and general health. It is such a well-priced supplement that you get much more than you pay for.

African Mango Advanced

Evolution Slimming African Mango Advanced
What we like about African Mango Advanced
  • Massive 2400mg serving of pure African Mango extract
  • Published scientific data showed average weight loss of 12lbs in four weeks
  • 30-day full money-back guarantee
What we don’t like about African Mango Advanced
  • May cause bloating if you are not used to eating fibre
African Mango Advanced is a straightforward weight loss supplement that contains 2400mg of African mango extract as the sole ingredient. Research has found that taking this superfruit can decrease hunger pangs, cholesterol and your waistline, as well as boost fat burning and energy.
Evolution Slimming is a well-known British supplements company based in Kent. You can buy straight from the official website or from other online stores, including Amazon.
African mango (Irvingia gabonesis) is a tree which grows in West Africa that produces a fruit similar to a mango (hence the name). Both the fruit and the seeds are edible, but it is the seeds that have been studied for weight loss. The high fibre African mango seeds have undergone clinical tests and there is evidence that they may help reduce waist measurement, improve insulin function and reduce cholesterol levels. The fruit is rich in antioxidants, so should improve general health and energy. One clinical test found that participants lost an average of 12lbs in four weeks.
According to the advertising, African Mango Advanced will boost fat burning and energy levels, decrease food cravings and LDL cholesterol, and improve the control of blood sugar levels. The serving size is very generous; original clinical trials looked at 300mg a day, but with this supplement the daily serving size is the equivalent of 2400mg, so it’s substantial.
Side effects may include mild abdominal pain, flatulence, headaches or insomnia, but overall this ingredient is safe and well-tolerated by most users. Although bloating may be an issue if you are unaccustomed to eating fibre.
Customers who have used African Mango Advanced feedback positively, often mentioning their successful weight loss.
There is a 30-day guarantee on offer with all Evolution Slimming supplements, so you can claim your money back if you are dissatisfied in any way.
One month’s supply of capsules (60 capsules) costs £14.99, and you can save money on larger orders. Two month’s supply costs £24.99 and three bottles (three month’s supply) costs £34.99.
An ideal choice if you are trying to improve health and lose weight without using stimulants.


What we like
  • Looks reasonably safe
  • Company doesn’t auto-ship their products
  • 67-day money-back guarantee
What we don’t
  • Somewhat expensive for one month’s supply when paying full retail price
  • Not many customer reviews to support claims
PhenQ is a diet pill that claims to burn fat, suppress appetite and improve mood. It contains some unusual ingredients, including a trademarked product called a-Lacys Reset, as well as a cactus extract and caffeine.
The blend of ingredients in PhenQ is designed to increase the speed of the metabolism to make fat loss easier. The unusually named a-Lacys Reset is a branded blend of alpha-lipoic acid and cysteine, an amino acid which is important for the synthesis of protein.
There is also nopal, a cactus extract high in the mineral manganese, which, like the chromium content, may help regulate blood sugar levels. Other ingredients include caffeine anhydrous – a strong form of caffeine, capsicum extract and L-carnitine fumerate.
Ingredient quantities are marked on the label, but not all of them are that strong. The caffeine will be noticeable though, because with 143.5mg of caffeine anhydrous it could be as strong as four cups of coffee. Other ingredients, such as just 8mg of capsicum extract, may be less noticeable. That said, many of the components are known to have health benefits and could help regulate blood sugar levels and the metabolism.
Looking at the reviews, some customers have found that it has decreased appetite and are satisfied, but others have experienced side effects such as nausea, dizziness and insomnia. So although this supplement obviously does not work for everyone, for others it works just fine.
You can buy PhenQ from the official website. This is a multinational site that provides information in many European languages, as well as English. Delivery details and prices are provided in all major currencies, including USD, AUD, Canadian dollars, Euros and sterling.
A 60-capsule bottle of PhenQ costs £45.00 ($69.95 USD) and you can make savings on bulk orders, such as buy two bottles get one free. Shipping is free worldwide, and there is a 67-day money-back guarantee.
PhenQ is definitely one of the best options available on the market.

Astral Nutrition Overpwr

Astral Nutrition Overpwr
What we like
  • Easy to take
  • Contains glucomannan – a proven appetite suppressant
  • Contains no stimulants
What we don’t like
  • Levels of glucomannan are low
  • Expensive if the full recommended dose is taken
Created by Astral Nutrition, Overpwr is another appetite suppressant that contains glucomannan as the main active ingredient, plus a blend of vitamins and minerals to help support general health while you lose weight.
Glucomannan is a natural fibre that is proven to reduce the appetite by making you feel full, and therefore less likely to snack or over-eat. It also helps prevent low blood sugar spikes and can aid digestive health by improving bowel function. As we’ve mentioned above, glucomannan is one of the few natural substances that has been approved as a safe weight loss aid by health organisations like the EFSA.
Although research has shown that taking 3g of glucomannan a day is the effective dose, the daily serving of Overpwr only adds up to 1500mg. This means to get the effective serving you would need to double up on the dose, which could become expensive.
That said, customer feedback is generally positive for this supplement and side effects do not appear to be an issue.
There is a money-back guarantee if you buy from the official website, but Astral Nutrition does not pay for the return delivery and charge an additional £6.00 admin fee.
If you buy Overpwr from the Astral Nutrition website it costs £29.99 for 60 capsules. If used as recommended, taking three a day, then your bottle will only last 20 days. If you did want to keep to the recommended serving size of glucomannan, and decided to double the dose, 60 capsules would last only 10 days, so it can become an expensive option.
We love glucomannan supplements, and Overpwr is right up there with the best of them.

Types of Diet Pills

As you can see from our list of top ten products, there is no such thing as a typical diet pill – there’s a lot of variation. Although all diet pills come with the aim of causing weight loss, they don’t all work in the same way.
For example, some diet pills help reduce your appetite, making it easier to resist snacking or eating too much at meals. Others prevent the absorption of calories in fats or carbs, so if you do over eat it does not add to weight gain.
Diet pills can also speed up your metabolism, sometimes with an associated energy buzz so that you lose weight more easily. Other diet pills use a variety of methods combined into one product.
Broadly speaking though, diet pills can be split into the following categories.

Fat Burners

The most popular type of diet pill on the market is the fat burner. So naturally, most of the supplements we review on the site are fat burners. Whilst they can be some of the best products around, they can also be some of the worst. Fat burners can vary a great deal in quality and effectiveness, so you do need to be careful about what you buy.
A fat burner has the simple aim of increasing the speed of the metabolism so that you can burn off more fat with less effort. In some cases this means raising the temperature of the body in a process called thermogenesis.
Increasing the speed of the metabolism is usually done with the aid of stimulants, often caffeine, although natural ingredients that are high in antioxidants are also effective. One of the best fat burning combinations is green tea paired with caffeine, as clinical research has proven that this formula works.
You can also find stimulant-free fat burners that help to boost the speed of the metabolism without the stimulant effects.
However, there are some companies out there that cram all manner of useless or potentially dangerous, even borderline illegal, ingredients into their fat burners. But don’t worry about those, that’s why we’re here: to let you know which ones to avoid.
If you suffer from a slow metabolism and have low energy levels, a good quality fat burner is an effective support to weight loss. Many people enjoy the buzz of increased energy they can give you too. But it is worth noting that some fat burners do present some concerns, and some may contain little more than caffeine – something you could easily get from a cup of coffee.
Taking a fat burner can certainly work for some people, but this method of weight loss does not suit everyone.

Fat Binders and Fat Blockers

Fat binders… Fat blockers… The names are pretty interchangeable. These types of supplements are aimed at preventing dietary fat from adding to your weight, and if you generally consume a lot of fat in your diet they can help you lose weight without having to make too many dietary changes. Many well known diet pills, such as Alli and XLS Medical Fat Binder, are fat binders, and they can be effective for some users.
They work by blocking a percentage of the dietary fat that you eat from being absorbed by your body and adding to body fat. They are composed of certain types of fibre that, once ingested, attach to the dietary fat molecules in the stomach. Once this happens the fat molecules are too big to be broken down by enzymes and absorbed by your body, so they are expelled as waste.
We hate to mention it but some fat binders are notorious for causing embarrassing side effects. Many people report spending a lot of time in the bathroom and can even experience the occasional “accident”, but effects will largely depend on the supplement you choose and how you take it. Other than that, fat binders are largely safe to use.
Just to be clear though, fat binders do not block ALL your dietary fats. The figure varies, and it is hard to prove what the exact figure is anyway. A supplement like XLS Fat Binder, for example, claims to block around 27% of fat, so if you have a high-fat diet, you should lose some weight even if you do not make too many dietary changes.
Fat binders/blockers do not work for everyone. If you don’t generally eat much fat they will not have much effect. In addition, taking a fat binder can lead you into a false sense of being able to eat what you want without gaining weight.

Appetite Suppressants

Appetite suppressants can be a good choice for you if your weight loss plans are generally derailed by hunger pangs, cravings, or overly large portion sizes. An appetite suppressant can help you resist those temptations and they are especially useful if you are trying to stick to a low-calorie diet.
Appetite suppressants fall into two main categories. The first is a fibre-rich supplement that fills you up by staying in your stomach, fooling your brain, body and appetite – triggering hormones into thinking you are full.
Supplements in this category contain ingredients such as glucomannan, which forms into a gel in your stomach and is very effective for steady weight loss. Other health benefits can include maintenance of blood sugar levels and lowered cholesterol levels. In general, appetite suppressants based on fibre are safe and effective. Glucomannan, for example, is approved by the European Food Safety Agency (EFSA) and has genuine scientific backing that shows it works as intended.
The other type of appetite suppressant is not so easy to define. Many diet pills based on stimulants have an appetite suppressant effect, as these types of stimulant affect the nervous system and can make you feel too jittery to eat. This type of appetite suppressant contains stimulants, such as bitter orange extract, that can cause the body to mimic the effects of stress, which decreases appetite. But this can also cause jitteriness, increased heart rate, and high blood pressure. This method of weight loss is not safe for long-term use and can cause a range of side effects in some users.
By contrast, an appetite suppressant that uses a fibre-rich ingredient, like glucomannan, is safe and effective and can help you lose weight without compromising your health.

Carbohydrate (Carb) Blockers

Carb blockers are sometimes known as starch blockers. They have an effect similar to fat binders, but instead of blocking dietary fats from the body they block carbohydrates.
In recent years, carbs have come to be seen as the major cause of weight gain and obesity, hence why low carb diets like the Keto diet are popular. Although it can be difficult to cut out bread, rice, pasta, and potatoes, many people are finding that this type of low carb diet works for them.
A carb-blocking diet pill is derived from certain foods, such as bean extract or garcinia cambogia, which contain a group of chemicals called alpha amylase inhibitors. Alpha amylase is a digestive enzyme in the body that breaks down carbohydrates into smaller units which are then absorbed by the body. By preventing the alpha amylase from working, a percentage of the carbs are blocked from adding to weight.
Carb blockers are not always reliable though. Studies have shown that effects can vary and that the percentage of blocked carbs can vary too. One study found that although a good quality carb blocker blocked up to 97% of the digestive enzymes from working, this only resulted in 7% of the carbs being blocked from absorption.
However, if carbs are your particular issue you may find that a carb blocker can slightly improve weight loss results.
Other benefits to carb blockers may include a decrease in blood sugar spikes, making the return to normal blood sugar levels after eating much faster. Other research suggests that some carb blockers can help reduce appetite and cravings by acting on the appetite hormone ghrelin.
Carb blockers are generally safe for most people and, although they are only effective for people with a mid- to high-carb diet, you may find that they help with weight loss.

Dual Action Diet Pills

Many diet pills use ingredients that can both suppress your appetite and increase fat burning. Often advertised as fat burners, because the prime benefit is to increase the speed of the metabolism, many dual action diet pills also work to suppress the appetite.
These types of diet pills sometimes contain stimulants that cause the body to mimic the effects of the “flight or fight” response – the body’s reaction to danger.
As we know, this causes effects such as sweating, increased heart rate and the loss of appetite. All of this can be effective for losing weight, but with the high risk of side effects, including issues around heart rate and blood pressure, this type of diet pill is not safe for everyone.
Some dual purpose diet pills contain so many different ingredients that they claim to do almost everything. You can sometimes find a range of ingredients associated with different weight loss benefits, such as bean extract for carb blocking, fibre for appetite suppression, and some added caffeine for increased energy, all rolled into one diet pill.
In most cases, multi-purpose diet pills like this are not as effective as supplements with only a few specific components. And although each individual ingredient may come with some evidence that it can help weight loss, low ingredient quantities often mean that effects are likely to be minimal.
Advertisers always tout the benefits of each of the ingredients while failing to point out that the serving size is often so small it is likely to be undetectable.
In addition, diet pills that claim to work in many different ways contain so many different ingredients they increase the risk of side effects.

Metabolism Boosters

Metabolism boosters are often interchangeable with fat burners because they both increase the speed of the metabolism. The difference is that metabolism boosters are generally aimed at improving exercise performance rather than weight loss, and these types of supplements can be much stronger.
Most metabolism boosters are aimed at athletes and bodybuilders looking for a way to make a workout more effective. As well as caffeine and herbal ingredients like green tea and green coffee bean extract, metabolism boosters sometime contain more dangerous stimulants, such as bitter orange extract or yohimbine.
Others may use ingredients that are said to increase the production of thyroid hormones. These types of supplements are often called T5 supplements, after the thyroid hormones Triiodothyronine (T3) and Thyroxine (T4).
Not all metabolism boosters are safe, but because they are designed to be used in combination with exercise the added stimulants can improve performance. If you are in general good health and have no underlying health issues you may find that a metabolism booster may help you maximise your workout.
When looking for a metabolism booster it is crucial to read through the ingredients list because, as with fat burners and dual action diet pills, there is no standard formula. So the results and the risk of side effects can vary. Most reputable sellers will provide a list of potential side effects and health warnings. It is also important to read through these and to follow the directions. Most advice is to reduce the serving size when you first take a new supplement so that your body can adjust to taking it, and so any potential side effects are kept to a minimum.
Metabolism boosters are certainly not for everyone, but they can be effective and are quite popular.

Frequently Asked Questions

Now we’ve seen the type of products that are out there, let’s take a look at some common questions and concerns surrounding diet pills.

What is the safest over-the-counter diet pill?

When it comes to safety, the most important factor for any over-the-counter (OTC) diet pill is that it has a full ingredients list, so you know exactly what it contains before you buy. Many diet pills contain caffeine, for example, so if you are trying to avoid caffeine this type of supplement will not be suitable for you, but it’s perfectly safe for other users.
A reputable OTC diet pill will provide full ingredients information, including quantities, so there should be no unpleasant surprises when you take the supplement.
If you are trying to avoid stimulants, an appetite suppressant based on fibre such as glucomannan is safe and will be effective for most people.
If you are looking for a fat burner, a supplement with effective quantities of caffeine and green tea should be fine for most users. Other potential ingredients include cayenne pepper and green coffee. These natural ingredients are safe and effective in the correct quantities and most people can take them with zero risk to health.
Not all diet pills are side effect-free for everyone, but one of the most important features of Diet Pills Watchdog is to evaluate each supplement for safety. So by keeping an eye on our website you will be able to stay safe and know what to avoid.

What diet pills work fast without exercise?

If you can’t or don’t want to exercise, a supplement that reduces your appetite will help you reduce your calorie intake and so lose weight. A supplement that contains glucomannan, for example, will work without exercise and will help you stick to a calorie controlled diet. Do this and you could find that you can lose up to a couple of pounds a week. This is considered a safe rate of weight loss and adds up to a whopping 8lbs over the course of a month.
If mobility is an issue, switching to a healthier diet and taking a safe appetite suppressant is also the best way to go. Anything that helps you reduce your calorie intake does not require exercise.
Although fat burner supplements are often aimed at people who do exercise, supplements that contain moderate quantities of caffeine and other weight loss ingredients, such as green tea, green coffee, or cayenne, are natural thermogenics, which may help perk you up. A supplement that increases the metabolism will make weight loss easier, but it will require you to make dietary changes.
You don’t necessarily need to work out in order to lose weight. Although it is good for your health to be more active, you won’t have to dig out the lycra and running trainers. Simple lifestyle changes such as walking more, dancing, and taking the lift instead of the stairs will help keep you fit and healthy.

Are there any weight loss pills that actually work?

Here at the Watchdog we review numerous supplements and we can confidently say yes, there are plenty of weight loss pills that work. However, none of them work by magic. For best results, you do need to make some lifestyle changes, such as changing your diet and/or getting more active.
You don’t have to eat significantly less, but you may need to change your diet. You may not need to exercise, but if you can get more active it will help your weight loss and your health in the long run.
Check out our list of top diet pill supplements above to find the one that is best for you. If you struggle with appetite but find it difficult to be active, an appetite suppressant will probably work best. But if you lack motivation and energy, you will probably find that a good quality fat burner is more suitable to your needs, as it will help you get motivated, and the extra boost to your metabolism should help the pounds drop off. If you work out in the gym, a metabolism booster may help you maximise your efforts.
Weight loss pills work differently for different people; the secret is to find the supplement that works best for you.

Are natural diet pills dangerous or bad for you?

It’s sad to say, but even though most natural diet pills are safe, some can be extremely dangerous. Many natural extracts contain powerful chemicals and can be just as dangerous as synthetic ingredients. It can also depend upon the quantities contained in the supplement.
For example, caffeine is safe and well tolerated by most people, yet if taken to excess it can cause a range of side effects, including increased heart rate, blood pressure and insomnia.
Other stimulants are of more concern. Some diet pills contain natural substances, such as bitter orange extract, yohimbine or synephrine, which in high doses can be linked to causing strokes and other extreme side effects.
One of the most dangerous sources of natural diet pills are those that are manufactured overseas, especially in China. These often contain unspecified quantities of unknown herbal ingredients, and are usually unregulated by any sort of government or official health agency.
It’s important to keep this in perspective though. Really dangerous products are in a minority, and by keeping up to date with the latest reviews on Diet Pills Watchdog you can be sure to find natural diet pills from reputable suppliers that won’t pose a risk to your health.

Which slimming pills work best for men?

Slimming pills work equally well for men as they do for women. The problem is that because many slimming pills are targeted at women the advertising can be off putting for men.
Most men will not be attracted by a supplement that shows a female silhouette as a logo accompanied by images of young women laughing while eating yoghurt. Neither will all men be impressed by stereotypical male advertising that implies that they should be spending every waking hour in the gym.
In general, weight loss supplements for men stress the bodybuilding angle and talk about improved strength and obtaining lean muscle. If you do want to lose weight by working out at the gym then a supplement that boosts the metabolism may help. Equally, a fat burner supplement that contains safe amounts of caffeine and green tea can help increase energy levels and weight loss without leaving you feeling wired or unable to sleep.
Luckily, not all advertising is along male/female lines, and a slimming pill that works for women is going to work for men too.
The ingredients list is the real key to weight loss. A fat burner that contains natural ingredients such as caffeine and green tea is a good combination. If you do work out, you may find a supplement with additional amino acids that supports muscle building is also effective. An appetite suppressant based on fibre, such as glucomannan, will also work equally well for both men and women.

Which slimming pills work best for women?

Lots of slimming pills are aimed at women so that the companies can create appealing advertising – promising tempting advantages such as fast weight loss, improved health, and a reduction in a dress size. But with such a wide range of choices available it can be hard to pick out the good products from the inferior.
The best slimming pills for women follow the same criteria as the best slimming pills for men. This includes a full ingredients list that clearly states each serving of every ingredient. These may vary, but they should conform to clinical testing so that you know there is a good chance of it working, and without causing a risk to health. There should also be a money-back guarantee so that if things don’t go to plan you can claim a refund.
The type of slimming pill that is best for you will depend upon your own needs and lifestyle. If you are an active person looking to improve your exercise regime and fat burning, a fat burner may be effective. If you work out in the gym you may be tempted by a sports supplement that supports muscle building as well as fat loss – these are often aimed at men but can work just as well for women.
If you struggle with restricting your appetite you may find that a glucomannan-based appetite suppressant suits you best.

How much do the best diet pills cost?

The best diet pills are not necessarily the most expensive. We have seen some shockingly bad diet pills that are very expensive but still don’t work. We have also found some very reasonable supplements for a fraction of the price.
In general, it is best to avoid anything that is too cheap, as there is probably a reason for that. It could be that it contains cheap ingredients that won’t work. More worryingly, some cheap diet pills come with very little background information regarding their manufacture or the ingredients list.
It is never a good idea to buy a diet pill on price alone if you are going to be putting an unknown substance into your body. It just is not worth gambling with your health. At the other end of the scale, a weight loss supplement that is ultra expensive could be using the inflated price just to give the impression that it is good quality.
If a supplement is of good quality and comes from a trustworthy and reputable company, provides full ingredients information, and comes with a money-back guarantee you can trust, it is worth paying a little extra for.


Buying diet pills should be easy, but, as we’ve seen, it’s not always straight forward. There are so many products on the market that it is easy to become overwhelmedby the sheer volume of advertising.
Plenty of diet pills promise an easy way to lose weight, and they employ some very persuasive arguments. Diet pill advertisers know exactly how to push our buttons.They often tell us just what we want to hear and, although we all know deep down that we are unlikely to become slim in a matter of days, we never stop falling for the same old clich├ęs.
But a reputable diet pill supplement CAN help you lose weight. There are some excellent products out there that will help you achieve your goals. Choosing the right diet pill for you can be a step towards a new healthy future.
The type of diet pill you choose will depend upon your own lifestyle and habits.
If you struggle with overeating or cravings, an appetite suppressant that contains glucomannan can be effective. This does not require exercise in order to work and it makes sticking to a calorie-controlled diet much easier.
Alternatively, if you struggle with motivation and are looking for general support, a fat burner will get you moving and help you shed those pounds faster. You will need to put some effort into using a fat burner for the best results, but most people find that this support makes the whole process much easier.
Working out at the gym and not sensitive to stimulants? A stronger fat burner or metabolism booster that diminishes your appetite while raising energy levels may be the way to go. And for people with a specific weight loss issue, such as eating too many carbs or too much fat, you may find a carb blocker or fat binder is effective.
People have lost weight successfully by using all types of diet pills; there really is no one size fits all solution. You do need to be realistic in your expectations though. A diet pill will not produce results instantly, so you should allow for a few weeks or even months before you start noticing a drastic improvement. After all, weight gain does not happen overnight either. It is often a slow process, so losing weight can be equally long-term, depending on how much you wish or need to lose.
We all have a factor that leads us to make the decision – an unflattering photo, or the fact that clothes suddenly feel tight – but we can’t expect the weight to suddenly fall off just because we have noticed it. According to NHS guidelines, a safe rate of weight loss is generally reckoned to be 2lbs a week, so keep this in mind and you could lose 8lbs in a month. A diet pill that offers support for safe and steady weight loss at this rate is more likely to work than a product that claims to make you lose 8lbs in a couple of days.
Another crucial factor is that taking a diet pill does require some input from you. Yes, you may find that by taking an appetite suppressant, a carb blocker, a fat blocker, or even a fat burner, you are able to lose a few pounds without making any changes to your diet and lifestyle, but you are not going to get the results that you want.
You do need to make some lifestyle changes in order to lose weight successfully, but with the aid of a suitable diet pill this process does not need to be painful or require superhuman willpower. If you choose the correct supplement and keep your weight loss plans realistic, you will succeed. There are thousands of success stories out there.
Once you have made the commitment to lose weight it helps to make your weight loss journey as easy as possible. Taking a weight loss supplement will get you on your way, and the more you can do for yourself by diet and exercise, the quicker you can reach your target weight.
For many of us this is not just about looking more attractive or being able to wear flattering clothes. There are numerous health reasons for losing weight, so what are you waiting for?