SlimJOY BootBurn Active XXL

Updated May 22, 2019.
Published Oct 28, 2018.

The idea behind SlimJOY BootBurn Active XXL is that you take it (a mango flavoured powder that you add to water) before a workout and you’ll burn more calories than usual. It is even said to work when you don’t exercise. This is a bit of a stretch, but you will notice a slight thermogenic effect. Our main problem with this supplement is the inclusion of yerba mate, which has been linked with a whole host of cancers. It’s quite expensive as each box only contains 15 days worth, but there is a money-back guarantee (although you’ll have to send any returns back to Slovenia).


  • Comes in mango flavour


  • Have to return to Slovenia if you are unhappy with the product
  • Claims to be clinically proven but there is no evidence of this
  • High quantity of caffeine
  • Many ingredients have no evidence to support how effective they are
SlimJOY BootBurn Active XXL
SlimJOY Boot Burn Active XXL is a mango flavoured supplement which claims to help you burn more fat, and is “the most powerful fat burner yet!”

We have looked at the SlimJOY Boot Burner Active XXL in closer detail and examined the ingredients, to see if it lives up to its claims of being clinically proven.

SlimJOY BootBurn Active XXL Overview

What you need to know about SlimJOY BootBurn Active XXL

SlimJOY Boot Burn Active XXL is a once-a-day powder supplement (mango flavour) which is designed to be dissolved in water and consumed 30-60 minutes before a workout. It claims to be clinically proven, and that it can help users to burn as many calories during a 20-minute workout session as they normally would during a 100-minute session without it, due to its thermogenic effect. It is made by Sensilab, a supplement company based in Slovenia.

What are the side effects of SlimJOY BootBurn Active XXL?

Yerba mate (green mate) is the most worrying ingredient in the supplement. It increases the risk of esophageal cancer, kidney cancer, stomach cancer, bladder cancer, cervical cancer, prostate cancer, lung cancer, and possibly laryngeal or mouth cancer. This risk is especially high for people who smoke or drink alcohol.

There are also other forms of caffeine in here, and these can cause effects such as jitteriness, anxiety, raised blood pressure and increased heart rate, increased need to urinate, insomnia, and disruption to sleep patterns.

How much does SlimJOY BootBurn Active XXL cost?

SlimJOY Boot Burn Active XXL, at the time of writing, costs £19.90 from the official SlimJOY website. This is a 33% discount on the original price of £29.90.

This price is for 15 sachets, which should last the customer for 15 days if taken as directed.

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SlimJOY BootBurn Active XXL Key Features

SlimJOY Boot Burn Active XXL is a once-daily weight loss supplement made in Slovenia by Sensilab, although the brand name is SlimJOY. It has a long list of ingredients, including many vitamins, to apparently help to burn fat quickly and effectively.

SlimJOY BootBurn Active XXL Key Points

  • Made in Slovenia by Sensilab
  • Contains 15 x 3g servings
  • Needs to be dissolved in water

The product is made by Sensilab, who appears to be based in Slovenia. However, their email address is a UK one, according to the official website: [email protected]

How to Take SlimJOY BootBurn Active XXL

  • One sachet per day dissolved in a glass of water. For optimal results, consume 30-60 minutes before physical activity

They stock a range of supplements under the SlimJOY brand name.

SlimJOY BootBurn Active XXL Concerns:

  • If you want to return a product, it has to be sent back to Slovenia which may be cost prohibitive
  • Claim their products are clinically proven when there is no evidence

What does SlimJOY BootBurn Active XXL claim to do?

Sensilab/Slim JOY claim that their Boot Burn Active XXL supplement is clinically proven and does the following:

  • Help you to burn significantly more fat while exercising
  • Help you to lose weight considerably faster
  • Have a thermogenic effect on your body – burn more calories and fat even when you’re not physically active
  • Maximise the impact of short exercise sessions
  • Gives you results from all types of physical activity – walking, running errands or playing with your kids.

Does SlimJOY BootBurn Active XXL work?

The SlimJOY Boot Burn Active XXL may work for some people. There are a couple of thermogenic ingredients in there that will raise the core temperature of the body, thus using more energy and calories to bring it back down to its normal temperature. It does work – but making it out that this will work if you’re lying on the sofa does no one any favours. The amount of extra calories burned without physical exercise will be very slight.

The claim about it giving you results from all types of physical activity – well, it’s quite obvious that any physical activity is going to help you lose weight. It’s a bit of a non-claim, if we are honest.

The amount of caffeine in there, in the guarana, green tea leaf extract, and yerba mate extract will make some difference, as we know that has some effect on weight loss.

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SlimJOY BootBurn Active XXL Ingredients

These quantities are correct per 3g serving of the supplement.

  • Guarana seed extract (with 10% caffeine) (500 mg): This is a berry that is naturally high in caffeine and it is often an ingredient in energy drinks and diet pills.
  • L-Carnitine L-Tartrate (500 mg): There is some evidence that supplementation of acetyl-l-carnitine can reduce body fat, although the strongest results were seen in the elderly. The ingredient also boosts energy levels and is used to treat fatigue.
  • Papaya Fruit Powder (250 mg): Papaya fruit powder contains a chemical called Papain which may have some effect upon the digestive system.
  • Green Tea Leaf Extract (with 95% polyphenols and 0.5% caffeine) (200 mg): Green tea is high in a group of antioxidants called catechins. Studies have suggested that catechins increase thermogenesis in the body, whilst the naturally occurring caffeine increases energy expenditure by boosting the metabolism slightly for a few hours, as well as boosting energy levels. Theanine is also found in green tea, and is thought to reduce the side effects of caffeine such as jitteriness, without reducing its effectiveness.
  • Green mate leaf extract (with 8% caffeine): This is also known as Yerba Mate. It contains caffeine and other chemicals which stimulate the brain, heart, muscles lining blood vessels, and other parts of the body.
  • Natural Mango Extract: This is purely for flavouring purposes.
  • Vitamin B3 (16 mg): This vitamin is normally only useful in cases of deficiency, although very high doses are known to help lower cholesterol (higher than the dose used in this product). Source
  • Vitamin B5 (6 mg): This is also known as Pantothenic acid. It is widely found in both plants and animals including meat, vegetables, cereal grains, legumes, eggs, and milk.
  • Vitamin B12 (2.5 mcg): Vitamin B12 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. Source
  • Vitamin B6 (1.4 mg): 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 B2 (1.4 mg): This is also known as Riboflavin. It is involved in many processes in the body and is necessary for normal cell growth and function. It can be found in certain foods such as milk, meat, eggs, nuts, enriched flour, and green vegetables.
  • Vitamin B1 (1.1 mg): This is also called Thiamine. Vitamin B1 is found in many foods including yeast, cereal grains, beans, nuts, and meat. It is required by our bodies to properly use carbohydrates.
  • Vitamin B9 (299 mcg): This is also known as folic acid. Folic acid is a vital component in the process of making DNA and speeding cell growth. Source

SlimJOY BootBurn Active XXL Side Effects

Yerba increases the risk of many cancers, and, alongside the other ingredients containing caffeine, can cause side effects such as increased need to urinate, heart palpitations, jitteriness, anxiety, disruption to sleep, and insomnia.


Not for use by individuals under the age of 18. Consult a physician or healthcare professional before using this product if you have any medical concerns/allergies. Do not use if you are pregnant or breastfeeding. Do not take more than the recommended dose.

SlimJOY BootBurn Active XXL Customer Feedback

We have been unable to find any independent reviews of the SlimJOY Boot Burn Active XXL.

SlimJOY BootBurn Active XXL Money-Back Guarantee

There is a 100% money-back guarantee. According to the terms and conditions on the SlimJOY website, products ordered can be returned within 30 days of purchase. Only the value of the product is refunded, excluding shipping charges. You must keep the invoice that accompanied the package and fill out a special returns form that you scan and email to [email protected] Intact products should be returned to Sensilab, Obrtna Cona 30, 1370 Logatec, Slovenia. A refund is made within 30 days of them receiving your returns package.

Where To Buy SlimJOY BootBurn Active XXL

You can purchase SlimJOY Boot Burn Active XXL from the official SlimJOY/Sensilab website.

Watchdog Verdict

We would probably like this supplement a lot more if it wasn’t for the fact it contains yerba mate. Whilst effective to an extent, the potential side effects of cancer far outweigh any benefits. The rest of the ingredients are ok – they do work for some people, and the dosage is ok. In fact, the caffeine dosage is on the high side, which, although can cause some adverse effects for some people, makes it more likely to work in terms of weight loss.

What we don’t like is the lack of independent reviews of the supplement. Usually, when people like supplements, they shout about it in forums. We can’t find any mention of this on any British or American websites. You are also taking the risk of ordering something from Slovenia – to return it to there is costly, and you do not get the shipping fee back.

We do not recommend the SlimJOY Boot Burn Active XXL to our readers.

How does SlimJOY BootBurn Active XXL compare to Phentaslim?

Criteria SlimJOY BootBurn Active XXL Comparison Phentaslim comparison
Clinically Proven Ingredients
Side Effect Free
Positive Customer Reviews
24/7 Support
Money-back Guarantee

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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