An ECA stack is a combination of ephedrine, caffeine, and aspirin tablets. When taken together, these ingredients are said to promote weight loss and boost athletic performance. The two most ...

Medically reviewed by Violetta Shamilova, PharmD An ECA stack is a supplement cocktail of ephedrine, caffeine, and aspirin. People use ECA stacks to improve exercise performance and lose weight.

Objective: To examine long-term safety and efficacy for weight loss of an herbal Ma Huang and Kola nut supplement (90/192 mg/day ephedrine alkaloids/caffeine). Design: Six-month randomized, double ...