ECA

So, I have some ephedrine tablets, haven't started using them as I'm studying loads for exams and have no time for gym sessions. Bought them cause I tried a few before one session and they got me really pumped etc.

Heard about the ECA (Ephedrine, Caffeine, Aspirin) stack and was wondering what advice people could give me about it? what ratios should I take, how many mg? do I start at a certain level and go up or just take the same amount?

I'm about 6'2" and ~82kg