Watchdog Approved Diet Pills


Thermopure is a weight loss aid from a company called My Protein. Despite having a thermogenic blend of ingredients, the company makes no claims about the product’s ability to increase weight loss. This is an unusual way of marketing a diet pill, so we decided to see if the product does aid weight loss, or if it merely reduces fatigue and tiredness, as advertised.

Is this fat burner from well known company MyProtein worth the investment, we take a look.

Thermopure Pros

  • Energy boosting and metabolism boosting
  • Several clinically proven ingredients

Thermopure Cons

  • Customers report various side effects
  • Proprietary formula so not all ingredient quantities known
  • No money back guarantee
Watchdog Rejected Diet Pills

Thermopure Review

Thermopure Facts

  • Manufactured by My Protein
  • Available in 90 or 180 capsule bottles
  • Marketed as an energy booster

Thermopure is apparently “ideal for anyone looking for a blend of key nutrients and minerals in an easy-to-consume capsule”, and makes no claims about causing or boosting weight loss, or affecting the metabolism.

Thermopure is manufactured by My Protein, a sport nutrition company. They can be contacted either by phoning 0845 094 9889 or by using the chat feature on their home page. When we contacted them to clarify what the ingredients were, they were helpful and prompt with their replies.

How to Take Thermopure

As a dietary supplement, take 2 or 3 capsules daily on an empty stomach before training or exercise.

On non-training days split the dose into morning, afternoon and evening.

There is also an email address. Whilst some of this contact information was not easy to find, being listed in places other than on the contact page, it is provided on the website.

Thermopure Concerns:

  • Customers report various side effects
  • No money back guarantee
  • Contains raspberry ketone- no human clinical evidence for use

What Does Thermopure Claim To Do?

Thermopure claims to contribute to a reduction of tiredness and fatigue. Whilst the website does not exactly describe this product as a fat burner, on the ingredients list the proprietary blend is called a Thermogenic Blend, suggesting that the company are well aware of its potential to boost the metabolism.

We suspect that by not making any claims about weight loss, and merely promoting it as an energy booster, the customer feedback is a lot more positive.

So What Is Thermopure and What Are The Ingredients For Thermopure?

The list below is the ingredients list provided on, the official manufacturer of Thermopure.

The Thermogenic Blend contains caffeine, raspberry ketones and cayenne powder. Because this is a proprietary formula, we only know that these ingredients total 300 mg per serving of three capsules. The other ingredients have their quantities listed separately, again, per serving of three capsules.

  • Polyphenols (from Green Tea Extract [std. to 95% polyphenols by UV, 50% EGCG by HPLC] 356.25mg): Green tea is high in a group of antioxidants called catechins. Studies have suggested that catechins, especially one type of catechins called EGCG, increase energy expenditure by boosting the metabolism temporarily. However, the metabolic increase caused by green tea is limited. One study found that the use of green tea was not enough to counteract weight gain following a very low calorie diet.
  • Caffeine: Numerous studies have shown that caffeine boosts energy levels and alertness, as well as mildly boosting the metabolism, causing a small increase in the number of calories used by the body. The effects shown in studies are small, and some studies are inconclusive.
  • Raspberry Ketone: Raspberry ketone is the part of a raspberry (and other fruits) that provides the distinctive smell of raspberries. Whilst it can be extracted from the fruit, especially for use in food flavourings and perfume production, it is much cheaper to synthesize it in a lab, especially for the large quantities that are required for use in raspberry ketone supplements.

    Whilst there is a small amount of evidence that raspberry ketone can cause weight loss in rats, there have never been any human trials on the potential weight loss effects of raspberry ketone. The safety of using such large quantities of raspberry ketone has also never been fully researched.

  • Cayenne Powder: Capsaicin is found in Cayenne pepper and is thought by some to play a role in weight loss. Some studies suggest it could suppress the appetite mildly, whilst others suggest that the heat causes a thermogenic reaction in the body, burning more calories for a period of time. However, there are also studies that show cayenne has little or no effect upon weight loss attempts.
  • L Tyrosine (200mg): An amino acid that is a building block of protein, this ingredient is found naturally in many foods including meat and dairy products. Some people use it as an appetite suppressant, but there is little evidence that it is effective for this use. Large doses of tyrosine may be useful for increasing alertness, especially in people who are sleep deprived.
  • L Theanine (125mg): This amino acid is found in green tea, and may play a small role in weight loss, as well as increasing feelings of relaxation. It may also reduce the negative side effects of caffeine, although there is seemingly no clinical evidence to support this claim.
  • Vitamin B6 (as Pyridoxine HCl) (5mg): Vitamin B6 has several important functions in the body, including ‘allowing the body to use and store energy from protein and carbohydrates in food’. Whilst taking excess amounts of vitamin B6 will not infinitely improve this ability, a deficiency could make it more difficult to lose weight. Vitamin B6 is naturally present in a wide variety of foods, including meat, cereals, bread and vegetables, and is often included in fortified breakfast cereals.
  • Bioperine (5mg): This patented Black pepper extract is used for increasing the bioavailability of nutritional compounds. In other words, it increases the amounts of nutrients that are absorbed into the body in the digestive tract. It may also increase the absorption of various drugs, which may lead to potential side effects.
  • Chromium (as Chromium Picolinate) (120µg): This is used primarily to lower fasting blood sugar levels and to lower insulin levels in people who have type 2 diabetes. In terms of its potential effect upon weight loss, it is possible that taking chromium picolinate by mouth for 2 to 3 months might produce a small weight loss of about 1.1 kg. Obviously this is an incredibly small amount of weight loss, but studies are still inconclusive.
  • Vitamin B12 (21µg): Vitamin B12 is naturally present in many foods, primarily meat, fish and dairy products. It has several roles, including aiding in releasing energy from consumed food, and keeping the nervous system healthy. It may be that a deficiency hinders weight loss, but taking excess amounts could be, according to the NHS, potentially harmful.
    Source: list a different ingredients list, but a representative from Myprotein assured us that this was an incorrect ingredients list, and that the formula for Thermopure has not changed over at least the last two years.

So What Does All This Mean?

There are lots of ingredients in Thermopure that have been associated with boosting the metabolism and increasing the speed of weight loss, including caffeine, cayenne and green tea extracts. Raspberry ketone is a popular ingredient but there is no clinical evidence in humans that it does boost weight loss attempts.

Chromium has some evidence to suggest it minimally affects weight loss in the long term. B vitamins are usually found in adequate quantities in a balanced daily diet, but many companies include them anyway in their products, as a deficiency can hinder weight loss attempts. There is little or no evidence to suggest that over-supplementing these vitamins will boost weight loss attempts.

Does Thermopure Have Any Side Effects?

Thermopure contains a significant quantity of caffeine, with 150 mg in each serving of three capsules. Consumers should remember that whilst caffeine is freely available in many diet pills, drinks and foods, it is not a side effect free ingredient. Consumers should monitor their intake of caffeine from other sources whilst using these capsules. Side effects of caffeine include headaches, jitteriness and shaking, increased blood pressure, increased heart rate, heart palpitations, increased urination, dehydration and insomnia.

These side effects can be minimised or avoided completely by drinking plenty of water throughout the day, ensuring caffeine is not consumed in the evening or late afternoon, and minimising caffeine intake from other sources such as tea, coffee, soft drinks and energy drinks.

Cayenne Pepper can cause stomach aches, indigestion, heart burn and changes in bowel movements, although the tolerance for this ingredient varies hugely between individuals. It can also cause excess sweating, a physical sign that the body is experiencing an increased thermogenic output.

Some customers have noticed that whilst using these capsules the sweat much more than normal. This is likely because of the various thermogenic ingredients used in the diet pill.


Not suitable for anyone under 18, pregnant or breastfeeding women, anyone with hypertension (high blood pressure), heart disease, or people who have sleep problems.

We recommend not to exceed the recommend suggested serving.

Any Thermopure Reviews From Customers?

The official website for My Protein allows customers to leave reviews of the products they have purchased. At the time of writing this review, Thermopure had over 350 reviews, with an average rating of 4.25 out of 5. Of these reviews, only 10 are one star, and 14 are two star ratings.

Customers are encouraged to leave a review to be in with the chance to win a £100 voucher, and this clearly encourages people who are happy with the product, and therefore more likely to shop with the company again, to leave their feedback.

Customers mention a few side effects, but are overwhelmingly impressed with the product, as an energy booster, pre-workout supplement and as a fat burner.

I love these little bad boys! I exercise in the morning so they’re perfect for giving you a little kick. it took me a while to get used to them on an empty stomach – few retching moment but once they kick in you can go for so much longer. They really give me the energy that I need andthey are a good little fat burner too. Currently dropped body fat from 28% to 24% and only been on them for a month, so far, so good!

I’ve been using these before HIIT routines. They definitely get your body temp up, get you sweating, give you that little bit extra oomph.. I’ve lost a bit of weight whilst using these but its still early days yet so long term effectiveness is yet for me to test. Kind of an odd side effect but every so often you taste raspberry (would be the ketones then). Capsules not overly too big but i can imagine a few people would need to wash them down with water.

Unfortunately, because of the layout of the website, only a few of the most recent reviews are visible, and so it is not possible to see why a few customers gave negative feedback about Thermopure.

So Does Thermopure Work?

It seems that as an energy boosting supplement, taken to combat fatigue, this product works incredibly well. However, as a weight loss aid, consumer reviews are a little more mixed, perhaps because that was not the reason that they bought the product.

The ingredients profile suggests that Thermopure could aid weight loss attempts, especially when used as a pre-workout supplement. Side effects seem common, but this does not seem to put off many customers, who are otherwise thrilled with the product.

Taking the product on an empty stomach seems to cause some side effects, so consumers should ensure they drink plenty of water with the capsules, and consider eating a small snack before taking the product before exercise.

Where Can I Buy Thermopure?

Thermopure can be purchased from the official manufacturer’s website. The product costs £13.99 for a pot of 90 capsules, or £24.99 for a pot of 180 capsules. 90 capsules will last the consumer between 30 and 45 days depending upon their desired daily dosage, and 180 capsules will last between 60 and 90 days.

What About A Guarantee

There is no money back guarantee on Thermopure but there is a 14 day returns period that starts on the date the item is received. Returned items must be in their original condition, sealed and unused.

Watchdog Verdict

Overall, this product is a mixed bag. It appears to be very good at boosting energy levels, based upon customer reviews- as this is the only claim that the company make about the product, it is good in this regard. It does also seem to have some potential to boost weight loss efforts, but as the reviews are not very focused upon this aspect, this is based upon the ingredients profile alone.

However, as effective as the product may be, the long list of potential side effects is a cause for concern, especially as many of these side effects are mentioned in customer reviews. The customer reviews may also be slightly biased, because of the incentive of potentially winning a £100 voucher should they leave a review.

Customers who like the company are much more likely to leave their positive review in order to get free products in the future. Overall, this is a fairly good product, but the side effects and lack of money back guarantee mean that it is not good enough to approve or recommend to our readers.

We reject Thermopure.

Watchdog Rejected Diet Pills

#1 Consumer Choice: Superfruit Slim

Superfruit Slim

Superfruit Slim

The most potent Superfruit diet pill on the market, includes clinically proven Raspberry Ketones, African Mango and Acai Berry.

Why is Superfruit Slim Watchdog Approved?

  • 4 strongest superfruit extracts in one capsule
  • Clinically proven ingredients
  • 30-day money-back guarantee
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<= Click here to Read our Full Review =>

Disclaimer: Our reviews and investigations are based on extensive research from the information publicly available to us and consumers at the time of first publishing the post. Information is based on our personal opinion and whilst we endeavour to ensure information is up-to-date, manufacturers do from time to time change their products and future research may disagree with our findings. If you feel any of the information is inaccurate, please contact us and we will review the information provided.

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