I used to be an ECA junky and used to at one point take 6 servings a day of 25 mg pharmaceutical ephedrine/200mg asprin and 200mg caffeine. Used to get ripped but man I'd be agitated like a punk.
Then tried those recent things before the ban like xenedrine/ripped fuel etc.. but didn't get the same effect. Probably burnt the fuck out of my receptors. Two years ago tried clen, spiropent and cycled it for about 5 weeks, used benedryl to counter the cell receptor problem but didn't find any benefit from it. Also hated having to take potassium and taurine due to almost getting nailed from sever calf cramps.
Sitting here I still have spiropent clen, still have a lot of ECA, not sure what you guys prefer. Reading about usnic acid which I think palumbo has in his line but not sure if all of this shit is just gimmick and really just need to up cardio, drink coffee and eat clean as hell.