The fastest way to slimming is always the most practiced, which is why fat-burning supplements always return to the fore in spring with the approach of the swimsuit test. But are we sure they have real effects or are they just a speco of money backed by the strong marketing campaigns that supplement companies periodically support? Let’s analyze the main substances sold for this purpose and the scientific evidence present in the literature, to understand if these fat-burning pills really can have a fund of effectiveness source.

Legal and illegal fat burning supplements

First of all we must make a necessary premise, in fact in this article we will talk about legal fat burning supplements , that is, approved and notified by the Ministry of Health. On the other hand, in the underground trade or in other countries, products based on Ephedrine , Yohimbine  and other substances are legal, which certainly have a slimming effect since they induce an increase in the oxidation of fatty acids, but also have dangerous side effects that can lead to even serious damage. So we are absolutely wary of the use of these substances given their danger.


One of the few supplements that has a lot of scientific evidence on its effect is caffeine , which can be a useful supplement for weight loss as long as you follow certain advice. Our body, in fact, adapts very quickly to its consumption by increasing the tolerated dose, so it is necessary to increase the dosage to have the same effects up to a certain limit, beyond which caffeine begins to have important side effects such as an increase in frequency. , sweating, anxiety, dizziness etc. This is why it is important to cycleits consumption with pause periods to avoid addiction, and always introduce it gradually. For coffee consumers, it would be an excellent solution to eliminate the consumption of coffee before taking caffeine or at least taking it decaffeinated.

The literature agrees with studies of high and moderate evidence  that caffeine increases the oxidation of fatty acids, primarily due to the increase in glycerol and free fatty acids in the bloodstream, compared to secondary effects due to adrenaline. Caffeine also increases metabolic rate and thermogenesis , as evidenced by other studies.