asia black has alot more other sht in it stimulant wise than the ephedra extracts.
only place you can get pure ephedrine hcl from is canada, or some other country, i havn't seen anyplace that sells it in the us.
if those otc stims work for you jasen, may just have to stick with them. I know there is some ingredient that gets put in all the otc stims, and i dont know if im allergic or what, but after i take a serving of any otc stim product, i feel like i've smoked crystal meth, and am basically high for a day or two. which i dont like. but with purely ephedrine + caffiene, it's nice.
i had seen a calculation made that showed how much caffiene you needed to go with the ephedrine, but it's 200 plus mg's.