Aspirine in the ECA Stack / ECA Fat Burner & ECA Booster
Aspirine = acetylsalicylic acid. In addition to Aspirine, the legendary ECA supplements contain caffeine and ephedrine (ephedra extract).
ECA Stack / Aspirin, Ephedrine & Caffeine:
Scientific studies in the 1990s have shown that both ephedrine and caffeine exert a pronounced fat-burning effect. However, the combination of these two active ingredients showed a much stronger effect. The two drugs alone did not have as much effect as this combination. However, the best results were found in combination with aspirin. Aspirin, caffeine, and ephedrine (ephedra extract) resulted in an average of 0.9 kilograms (kg) of fat lost per month in this study. All study participants did not follow a diet, but only used the ECA (ephedrine, caffeine, aspirin) capsules.

Researchers also found that the effects of ephedrine (ephedra extract) and caffeine fell sharply over the weeks. This fact was due to increased prostaglandin secretion and phosphodiesterase secretion.

In this way, the body tries to counteract the strong, triggered by ephedrine and caffeine adrenaline release. The only conclusion left was the addition of acetylsalicylic acid (aspirin). Aspirine is a known prostaglandin and phosphodiesterase inhibitor.
Aspirine in the ECA stack:
This created the world-famous ECA Stack and the formula included aspirine as the deciding factor. The combination of ephedrine, caffeine and aspirin (acetylsalicylic acid) worked over the full 12 weeks of the study and resulted in an average fat loss of 6 kg within this period. All persons were mindful inactive and also pursued no calorie-reduced diet.

If you want to use the ECA Stack and get the most out of it, you should of course follow a training program and a healthy and reduced-calorie diet at least 3 times a week. This will optimize the results.