Ok, so unfortunately I'm one of those guys who is pretty sensitive to stims. I get really anxious, jittery, and sweaty, very uncomfortable. I'm trying to find a decent ECA type product that I can take, but they all have X# mgs of ephedra, not the actual amount of ephedrine though. What's the typical % concentration of actual ephedrine per mg of ephedra? I know a couple of the products I've seen claim 50, 65, and 150 mgs of ephedra each. It's been a while but I thought I remembered the old ripped fuel caps being around 10% standarized of ephedra alkyloids, is that pretty standard? So in the above products it would be around 5, 6.5, and 15mgs each, or can the % vary greatly from one to the next. The Walgreen's here locally doesn't ever seem to have the bronchaid in stock or else I'd just make my own stack.