ECA Stack strips the formula down to three actives: Eria Jarensis (N-Phenethyldimethylamine HCl), caffeine anhydrous and Aframomum melegueta seed extract.
There is no sprawling blend here — it is deliberately centred on stimulant ingredients in a convenient one-capsule serving. This makes stimulant tolerance especially important, and it should not be stacked with other caffeine or stimulant products.