Watchdog Approved Diet Pills


The latest new and improved MaxiSlim diet pills claims to suppress appetite and boost metabolism without the need for any particular diet or exercise programme. Can the thermogenic and appetite suppressing ingredients really help to burn extra calories 24 hours a day?

We take a look at this “proven natural weight loss product” to see if it’s the answer to your reducing fat and achieving fast weight loss!

MaxiSlim Pros

  • Contains some promising ingredients
  • Available from a variety of online retailers

MaxiSlim Cons

  • Ingredient amounts not always listed by retailers
  • Lack of consumer testimonials
  • Claims to be “proven” but no supporting evidence
  • No manufacturer money-back guarantee
Watchdog Rejected Diet Pills
MaxiSlim Bottle

MaxiSlim Review

MaxiSlim Facts

  • Not available directly but stocked by 3rd party retailers
  • Claims to be a fat burner, appetite suppressant and antioxidant
  • Lacking in supporting clinical data

We first tried to find out more about the manufacturer of MaxiSlim. We struck out as we could find no information as to who is behind MaxiSlim diet pills! This was until we were contacted by the manufacturer “Health Arena Limited” who own the product but not the MaxiSlim website, which is owned by MaxiMuscle.

We initially only found MaxiSlim available from 3rd party retailers and not directly from the manufacturer. Since receiving new information from the manufacturer we can see that MaxiSlim is available online directly from the manufacturer.

Our next step was to look at the retailers stocking MaxiSlim. A number of health food and weight loss retailers that seem to be only based in the UK stock MaxiSlim, many of which seem to be sold from fairly average and amateur looking websites!

Encouragingly our research found NO reports of MaxiSlim scams online.

There also appears to be a MaxiSlim Night version available too, that can help you lose weight whilst you sleep! This contains no stimulants but a range of amino acids to help promote muscle tone and regeneration as well as continuing fat burning.

Although no special diets are suggested to be required with MaxiSlim, to get the best results it is recommended to be used alongside a healthy diet and regular exercise routine.

You are suggested to take 1 to 2 capsules 30 minutes before breakfast and 1 to 2 capsules before lunch, repeating for 5 to 6 days with a day off. You are advised to reduce caffeine intake from your diet, so if you regularly drink tea or coffee you should reduce your intake, along with ensuring you drink plenty of water throughout the day.

MaxiSlim Warnings:

  • Lack of clinical data to backup any weight loss claims
  • Some side effects experienced by consumers
  • Ingredient amounts not always revealed by online retailers

What Does MaxiSlim Claim To Do?

The claims made by online retailers of MaxiSlim is that it’s a proven weight loss supplement containing thermogenic and appetite suppressing ingredients that;

  • Boost weight loss by increasing metabolism
  • Suppress appetite to reduce food cravings
  • Increase energy levels

So MaxiSlim is a dual acting diet pill that looks to increase metabolism along with reducing appetite so that you burn more calories whilst reducing calorie consumption. It is claimed that the unique combination of natural herbs within MaxiSlim will help to achieve fast weight loss.

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

Most retailers selling MaxiSlim promote it as an effective natural supplement. We found many of the ingredients to be familiar and can be seen in other supplements.

The ingredients in MaxiSlim are not always fully disclosed by retailers but after some searching we were able to get the listed amounts.

  • L-Tyrosine (200mg): May help in suppressing appetite and works to promote healthy thyroid function and improved, more efficient metabolism.
  • Green Tea (100mg): Numerous studies have reported the positive benefits for weight loss through increasing the metabolism. Also a potent source of antioxidants that could be beneficial for health.
  • Caffeine (91mg): Common ingredient in diet pills and not the most effective fat burning ingredient. Studies have shown it can give short term energy release and improve concentration.
  • Griffonia Simplicifolia (5-HTP) (20mg): Amino acid that can help boost serotonin (also known as the “happy hormone”) levels, improving mood and could help to control appetite.
  • Conjugated Linoleic Acid (CLA) (60mg): A number of studies have shown could help in weight management although is dependent on the daily dose. Most significant results have been found on body composition as fat loss is modest at best. (
  • Guarana Seed Extract (50mg): Stronger than caffeine and is released slower into the bloodstream.
  • Bioperine (2.5mg): Also know as Black Pepper extract. Helps to increase the rate of absorption of nutrients taken at the same time by up to 3 times.
  • Vitamin B6 (2mg): Water soluble vitamin that plays an important role in many amino acid reactions and helping release glucose.
  • Cayenne Powder (150µg): A strong antioxidant that has been suggested to boost metabolism to promote weight loss.
  • Chromium Picolinate (12µg): Suggested to help weight loss but the effects of Chromium on body weight and composition may be called into question though. (

So What Does All This Mean?

At first glance MaxiSlim looks to contain a good mixture of ingredients designed to promote fat burning and help to suppress appetite. Upon looking at the ingredient profile and more importantly the quantities used, it relies heavily on caffeine, Green Tea and L-Tyrosine.

The other ingredients used are in fairly small amounts and we question whether these will have much impact!

Does MaxiSlim Have Any Side Effects?

There are a number of stimulants contains in MaxiSlim that may and have indeed caused some side effects with consumers. Symptoms such as nervousness, tremors, sleeplessness and nausea may be experienced if you are particularly sensitive to caffeine.

Do not take MaxiSlim later than 3pm to avoid insomnia.

Caution: You are not recommended to take MaxiSlim if you are allergic to shellfish, pregnant or breastfeeding, on any medication, suffer from heart conditions, thyroid problems, high blood pressure, diabetes, or are under the age of 18.

Any MaxiSlim Reviews From Customers?

We only found a few MaxiSlim consumer reviews, a concern for a supplement available for some time!

A couple of the reviews we did find were not too favourable. They suggested that appetite was reduced slightly but complained of side effects or not losing any weight!

So Does MaxiSlim Work?

The ingredients in MaxiSlim are not fully disclosed so it is impossible to know if sufficient amounts are available to actually work. No references to clinical trials to backup any of the claims made by MaxiSlim either.

Not a great start! So let’s take a look at the ingredients to see if they have the potential to promote weight loss.

L’Tyrosine, Green Tea and Cayenne Powder have all been shown to positive weight loss properties and have studies that suggest they can help suppress appetite and boost metabolism IF present in enough quantities.

The polyphenols and caffeine in Green Tea have been shown to increase metabolic rate and boost fat oxidation. A study published in 1995 [1] has demonstrated the potential for the daily intake of 90mg of Green Tea Extract found in MaxiSlim to influence metabolism by approximately 4%. However, some studies have found 300mg of Green Tea extract to be required to exert any real changes in metabolism!

Evidence from clinical trials dating back to 1995 [2] has shown that the capsaicinoids (capsicum extract) found in Cayenne Powder can boost metabolism by increasing resting metabolic rate. Diet pills that contain much higher amounts of capsicum extract (Capsiplex Plus) have reported an increased 12 times more calorie expenditure up to one hour after exercise compared to when they took placebo!

Although the Green Tea in MaxiSlim has been found to exert a marginal effect on metabolism, the remaining ingredients are either in too small quantities or are not considered to be that effective.


  1. Efficacy of a green tea extract rich in catechin polyphenols and caffeine in increasing 24-h energy expenditure and fat oxidation in humans, 1999.
  2. Yoshioka M, et al: Effects of red-pepper diet on the energy metabolism in men. J Nutr Sci Vitaminol 1995; 41: 647–656.

Where Can I Buy MaxiSlim?

Available from a number of UK online retailers and the Health Arena Products website costing from £5.50 ($8) for 12 capsules to £42.99 ($69) for 150 capsules.

The money-back guarantee on offer depends on the retailer, so always check what they offer before buying! There does not appear to be a money-back guarantee offered by the manufacturer.

Watchdog Verdict

MaxiSlim may help you to lose weight but without any clinical data to support claims it’s likely that any weight loss is due to health eating and regular exercise. The possible side effects are a concern too!

There is a real lack of information about the manufacturer’s of MaxiSlim as the supplement is sold from 3rd party retailers.

With few if any consumer testimonials available despite being available for some time we have real reservations about the quality and effectiveness of this diet pill. There are other much better diet pills available at comparable prices to MaxiSlim that contain higher amounts of the few ingredients that can work.

For these reasons we reject MaxiSlim diet pills.

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
  • FREE shipping and buy 3 get 1 FREE offers!

<= 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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13 comments to “MaxiSlim”

Like to leave comment?

  1. Diane Scott says:

    Dear Sir/Madam,

    I am writing regarding your comments about our product Maxislim on your website. I am the Company Director of Healtharena and we manufacture Maxislim.

    Although we own the name Maxislim, we do not own the website Maxislim. Maximuscle own this site and do not want to sell it. We do sell Maxislim direct from our website ( We do not advertise this fact on our packaging as this would upset retailers that sell our product. We sell Maxislim to health food distribution companies, independent health stores and pharmacies and some pharmacy chains.

    Maxislim is not a drug or medicine. It is a Natural Health Supplement, therefore does not have clinical trials.

    The ingredients in Maxislim are listed on the label in full and this is all approved by the HFMA. We cannot control what our customers write about our product on their sites, so some may not have added the ingredients list in their text when talking about the product. We also cannot comment on the quality of their websites.

    But customers purchasing Maxislim will receive a product with the full ingredients listed on the bottle and any possible side effects (which are mentioned due to legislation, not due to customer experiences).

    We have many testimonials if you would like any examples and having sold Maxislim for many years have numerous repeat sales, proving that the product works.

    I would like to speak to someone regarding the misleading information on your website before taking this further. Could you contact me as soon as possible.


    Diane Scott

    • admin says:

      Thank you Diane for your comments.
      We do endeavour to research products we review in as much detail as possible using freely available information in the public domain. Where possible we look into the manufacturer, retailers and other consumer watchdog sites to collate what we hope is a balanced view. In some cases part of the story maybe missing as this depends on the transparency of the manufacturer and suppliers.

      Lets address your concerns in order:
      1) Maxislim ownership clarification.
      Thank you for notifying us that “Health Arena Limited” own MaxiSlim, we will update our review to reflect this.
      2) MaxiSlim is a Natural Health Supplement, does not have clinical trials:
      We noticed on your website that you refer to your products are “based on research and we endeavour to source the highest quality natural products that have proven benefits”. We were unable to find ANY mention of such research that supports that MaxiSlim can be effective for weight loss when we looked at retailers selling your product and even now when looking at the Health Area Products site.
      3) MaxiSlim Ingredients:
      One of our main criteria for reviewing a diet supplement is to ensure that ingredients are listed so that consumers can make an informed decision and know what they are taking. Incomplete ingredient profiles mean consumers cannot make that decision unless they buy the supplement, by then it could be too late. As you can see we outline the ingredients in MaxiSlim.
      4) Positive MaxiSlim testimonials:
      We are delighted that you have positive testimonials and repeat sales. Again during our research we found mixed reports using quality, reputable sites such as

      As you can see with other products we have reviews consumers do post both positive and negative experiences they have had with not only the product itself but with the manufacturers.

      The fact is, the material we have on falls in the realm of “fair use” and “fair comment” this allows consumer advocates like ourselves to draw attention to products in the public realm. We try to do this in a fair and balance manor and present the facts as we see them and which are readily available to consumers.

      Diet Pills Watchdog Team

  2. Susan Brear says:

    Hi There, I would like to add that for years I have struggled with my weight after having underactive thyroid and having 2 children and going through the menopause. I was excatly 5 stones over weight year after year I have tried diet clubs and endless slimming aids, Maxislim has been fantastic for me I have since lost 4 stones I feel much healthier and so pleased with this product! I now recommend to everyone I meet. Thanks for giving us, the customer the chance to comment.


    • admin says:

      Hi Susan,
      Well done on the weight loss! We like to share positive stories, along with negative ones, from genuine consumers on both approved and rejected diet pills that we review.
      We pride ourselves on providing a lot more information on products than revealed elsewhere but also on the feedback from actual consumers who have used them.
      We wish you all the success in the future.
      Diet Pills Watchdog Team

  3. dissatisfied says:

    Glad you lost weight but didnt work for me at all :(
    Tried it for 3 weeks and not lost any weight. The only plus side no side effects!

  4. NB says:

    I took these tablets for the first time yesterday and was extremely disappointed with them for the simple reason that I felt violently sick in my stomach. I did not take them once I noticed that I was feeling nauseous. Today is the day after now and I haven’t taken any since lunch yesterday and I still feel sick and did not get a minute sleep last night. Would not recommend taking them.

  5. Musa says:

    I took my first pill today and i feel great,not nauseous but i couldnt finish my lunch portion.feeling great hopefully i will shred the xtra kilos.

    happy Musa,

  6. suzanne says:

    a previous workplace sold them so I took them as a way of being able to promote them to clients, i took them before and after they were ‘improved’ and I have to say they were indeed improved!!!
    I would tell clients that providing they follow the guidlines, there should be minimum side effects but as consumers dont always, there were clients who would take them then NOT eat 30mins later and would subsequently feel sick or have cramping and believe it or not some who had high BP would also try to buy from us, we would refuse sale but leads me to think they would take them from elsewhere!
    I still take them, as directed, and have found them to have increased my quality of life as I have IBS, the Maxislim tablets stop me from bloating after every single meal. They really do increase energy levels and improve muscle function as I have went to the gym on and off them and can really feel the difference! I have researched the ingredients myself and believe its the black pepper that helps the bloating, so i tried other pills that contain high levels of pepper but to no avail so until further notice, Im with Maxislim!!
    The only one negative I have is that I emailed Health Arena and flagged it as important but never got a response. I would still like them to contact me!
    Thank you!!

  7. diane says:

    hi i’ve an over active thyroid and i am taken eltroxin the last 2 yr can i take theres pills.

  8. michelle says:

    I’m 15 years old and i started taking these pills today find them brilliant didn’t eat or feel hungry all day had loads energy to exrecise :) the only problem was I suffer from bad anxeity :( and these give me horrible panic attacks but anything with caffine usaully makes me panic :/ but they seem really good and hopefully I lose weight :D

    • Watchdog Staff says:

      Hi Michelle,
      We believe that Maxislim is a dietary supplement that is recommended for over 18 year olds. We wouldn’t suggest continuing to take them and would contacting your local GP to check if they recommend you taking them.
      Diet Pills Watchdog Team

  9. wilma jess says:


    • Watchdog Staff says:

      Thanks for your feedback Wilma.
      We have just taken a look and cannot see the full ingredient profile for this supplement on the website. Where does it reveal the actual ingredient amounts on the website?

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