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ReActive: T5 Black Fat Burner

ReActive T5 Black Fat Burner’s official website markets the product as the ‘strongest T5 fat burner’. However, some of the product’s ingredients have been linked to some unpleasant side effects.

Below we have reviewed ReActive T5 Fat Burner against our review criteria to help consumers make an informed decision.

Reactive T5 black

ReActive: T5 Black Fat Burner Pros
  • Some ingredients are supported by clinical studies
  • Manufacturers recommend using the product alongside a diet plan
ReActive: T5 Black Fat Burner Cons
  • Side effects have been associated with some of the product's ingredients
  • No money-back-guarantee offered

ReActive T5 Fat Burner is marked as ‘Rejected’ as it fails to meet all of the points on our ‘Approved Criteria’. To find out more about how ReActive T5 Fat Burner performed against our criteria click here.

Reactive T5 Black Fat Burner Review

Reactive T5 Black Fat Burner is manufactured by a company called DesirableBody. The product contains ingredients that are commonly found in T5 Fat Burners such as bitter orange extract and green tea extract. Although some of these ingredients are supported by clinical studies, some are associated with various side effects.

Claimed weight loss benefits

The company behind Re:Active T5 Black Fat Burner claim that there are several ways in which the product works in order to help you to lose weight. They claim that it will suppress your appetite, help with fat burning, and boost your metabolism. There is however no diet plan associated with the product.

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How Reactive T5 Black Fat Burner Works


The manufacturers claim that the product will burn fat, boost your metabolism, and boost your energy. The product’s ingredient list should give us insight into how the product strives to achieve this.

The first ingredient in ReActive T5 Black Fat Burner is caffeine. Caffeine is thought to boost the energy and is often used expressly for this purpose. It also has links to boosting the metabolism – as does green tea, which is one of the other ingredients in this particular pill. L-Tyrosine has been claimed to help athletic performance by some who use it, which would contribute also to the energy boosting area, as has another of the ingredients, 5-Hydroxytryptophan, or 5-HTP for short (made by your own body from the L-Tryptophan in the supplement). This is thought to help people lose weight by suppressing their appetite and making them eat less, as well as helping the metabolism to deal with what has been eaten in a more effective way. Lastly, Pyridoxine Hydrochloride (which you may recognise from its more common name, Vitamin B6) is included as an ingredient which supposedly helps the body to metabolise fats and proteins much more easily.

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Key Ingredients

bitter orange peel in t5 fat burner
The list of ingredients shown on the Desirable Body website tells you all that you need to know about the product and how it is made up. At the top of the list in terms of volume is caffeine, with 250mg in each capsule, which provides an energy boost and helps to suppress your appetite. L-Tyrosine is next, with 140mg, and this helps to stimulate several glands and could provide workout benefits. Naringin makes up 50mg, a substance taken from citrus fruit, and L-Tryptophan is included in 35mg (also known as 5-hydroxytryptophan or 5-HTP). 30mg of Citrus Aurantium is also a natural ingredient, and a Green Tea 4:1 extract of 30mg heightens the effects of the caffeine to give a stronger boost. Pyridoxine Hydrochloride, which is usually known as Vitamin B6, measures 1.4mg of the capsule, and magnesium stearate is also included. The capsule also contains gelatine as a gelling agent, so it will not be suitable for vegans or vegetarians who wish to stick to a strict diet. This is the full list of the ingredients as provided by the manufacturers, with caffeine, green tea, 5-HTP, and Vitamin B6 being the main ingredients to look out for in terms of weight loss effects.

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Clinical Studies


No clinical trials have been conducted on ReActive T5 Fat Burner itself. However, various studies have been conducted on the product’s ingredients.

Caffeine and Green Tea

This is often a very big component for weight loss pills because of the energy boosting power that it provides. It is particularly effective when combined with green tea, as it is here, so we will examine both of them together. It has already been scientifically established that some of the benefits of drinking or otherwise consuming caffeine include reduction of fatigue, an increase in physical performance, and weight loss, so long as it is consumed as part of a healthy supplement and not combined with high sugar or calorific content. As for green tea, one study has already found that combining it with caffeine saw a marked improvement in weight loss and maintenance for those who were overweight or moderately obese. It is currently thought that the catechins1 in green tea are responsible for a fat burning effect .


Has been looked at in a number of small studies to explore whether or not it can help people to lose weight. One study, which looked at participants who were not trying to lose weight, saw that they consistently ate less calories while taking 5-HTP than did a control group who were taking a placebo2. The belief is that 5-HTP makes you feel more full after you have eaten and suppresses your appetite, so that you are less likely to overeat and will stick within a sensible calorie intake amount. Another study which followed the first found that those who took 5-HTP lose around 2% of their body weight when they were not dieting, and around 3% when they were dieting3. In comparison, a control group taking a placebo did not lose any weight. The doses in this study were however very high, so this should be taken into account.

Vitamin B6

We already know for certain that Vitamin B6 helps to metabolise fats and proteins within the body as well as producing energy by turning food into glucose4, which means that we do not need to see clinical evidence any further – this is an accepted fact within both the medical and the scientific communities. It has also been shown through at least one clinical trial that L-Tyrosine can help to improve exercise capacity in conditions such as high temperatures5, which means that it will help those who are following a healthy exercise plan to continue on the right path and work out for longer.

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Reactive T5 Black Fat Burner Side Effects

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Desirable Body, the makers of Re:Active T5 Black Fat Burner state clearly that you should be careful to take your pills at least five hours before you go to bed, as otherwise you may experience some interference with your sleeping pattern. They also note that you may start to feel “unwell” if you take more than the recommended dosage, and that you should stop taking the capsules if this is the case. They also note that if you take the capsules too late at night, you will not be able to sleep in a satisfactory manner.

As for the ingredients of the product itself, these may have a large number of side effects associated with them, depending on your own personal tolerance levels and how you are able to stand the amount included in the capsules.

Caffeine is perhaps the most notorious element when it comes to side effects, as taking a supplement of this kind can cause severe to mild side effects in many people. It can cause a feeling of jitteriness or anxiety, as well as sleeplessness due to the fact that it increases your energy levels. It can even cause irritability in some people. When combined with green tea, it can cause vomiting, diarrhoea, headaches, insomnia, dizziness, heart palpitations, abdominal spasms, and loss of appetite if taken too regularly. The problems associated with 5-HTP are rather more serious, as it has been reported to be linked to deaths of some athletes who took it to enhance their performance, by developing serious conditions such as EMS (eosinophilic myalgia syndrome). Some of the milder side effects can include nausea, heartburn, gas, and rumbling sensations. Even Vitamin B6 is not immune – those taking a larger dose than their bodies can handle have experienced sensitivity to sunlight, nausea, abdominal pain, allergic skin reactions, loss of feeling in the legs, and imbalance.

As with all diet pill supplements, you should be sure to check with your doctor before taking them if you have a pre-existing condition, and you should avoid them if pregnant or nursing.

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How To Use Reactive T5 Black Fat Burner

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According to the manufacturers, when you wake up in the morning, and ideally about thirty minutes before you have breakfast, you should take one capsule with a large glass of water. It is important to stay hydrated, as this will help the capsules to be more effective and prevent some of the potential negative side effects. Your second capsule of the day should be taken around thirty minutes before lunch. If you intend to work out, however, you can take the capsule thirty minutes before your exercise begins instead. When taken half an hour before a meal, the effect is claimed to be a feeling of fullness which helps you to stick to a healthy diet plan; taken before working out, it is said to improve your performance during the exercise and increase the amount of fat that you burn for fuel.

You should take the capsules at least five hours before you intend to go to sleep to avoid interference with your sleeping pattern, and you should only take one capsule twice a day at first in order to see what your tolerance for it is. Later on, you can take two capsules twice a day if you do not experience negative side effects.

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Who Makes Reactive T5 Black Fat Burner

ReActive T5 Black Fat Burner is made by a company called DesirableBody. DesirableBody sell a number of weight loss supplements including ReActive T5 Super and ReActive T5 Super Thermo. To find out how ReActive T5 Super and ReActive T5 Super Thermo compare, read our comparison of the two products.

DesirableBody state that their capsules have been scientifically formulated and are all safe and reliable, though there is not any evidence to back up these claims in the form of published studies done by independent research teams.

There are multiple ways to get into contact with the company. You can call them on an order hotline, email them at a customer support address, track them down at their main offices with a street address, use live chat on their website, or connect with them on social media pages such as Facebook and Twitter.

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Where to Buy Reactive T5 Black Fat Burner


The main place to buy Re:Active T5 Black Fat Burner is through Desirable Body, who are the creators and main suppliers of the supplement as well as of the rest of the range which accompanies it. This is obviously a great place to start if you are shopping around because you know that you will be getting the real thing, and you will be able to contact them directly if you should experience any problems or have any questions. You can currently purchase a bottle of sixty capsules, which is supposed to last for one month, on their website – this is available at a price of £39.95, though discounts are available. If you buy two bottles from them then they will cost £33.95 each, while three bottles will lower the price yet further to £29.95 each.

You can also, of course, get hold of the supplement on Amazon. Re:Active T5 Black Fat Burner is available there in the same bottle size of sixty capsules, which again is supposed to last you for one month. The great news is that you can get it here for £29.95 per bottle with free delivery included, even though it is still stocked directly by Desirable Body to Amazon. This means that you get the same level of reassurance at a lower price, and most likely with a quicker delivery service too.

You can also find this product to buy at other online sites, as it is quite a popular diet pill, so look out for sites such as eBay and even the more reputable The prices will vary so it is always important to check that you are getting the best deal, and to make sure if possible that there is no doubt about it being the genuine product that you are ordering. It is more difficult to create convincing fakes of this diet pill because of the unique black bottle, but as with most popular diet pills it is possible that you will see a fake if you buy from an unreliable stockist.

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Does ReActive T5 Black Fat Burner Meet our Approved Criteria

Money-back-guarantee: No, we could not find any information about a money-back-guarantee.

One-off payment: Yes, for £29.95 per month’s supply.

Manufacturing Standard: We couldn’t find any mention of manufacturing standards on the official website.

Accompanying Diet Plan: No but the website urges customers to follow a diet plan alongside the product.

Ingredients and quantities disclosed: Yes.

Company contact details readily available: Yes.

ReActive T5 Black Fat Burner doesn’t meet our ‘Approved’ criteria as it doesn’t come with a money-back-guarantee and no manufacturing standard can be found.


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Overall Verdict

ReActive T5 Black Fat Burner contains some ingredients which according to clinical studies have the potential to assist weight loss. Some of these, however, may lead to unpleasant side effects.

The manufacturers of the product encourage a healthy lifestyle alongside the product and disclose ingredient quantities, however, they do not offer a money-back-guarantee.

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