First of all, I take meth, adderall, and dexedrine very regularly -- I'm sorry to say that there really isn't much of an alternative that gets the job done similarly. If you find something, lemme know.I once took half of a small dose of some workout aiding / fat burning / whatever stimulants I got at GNC... Yohimbe, country mallow, bitter orange combo or something. My palms were covered in sweat, I was white as a sheet, I felt like I was having tremors, and had no energy at all. Was very unpleasant and I was very, very jittery. Very high pulse. Didn't take my BP. Was more jittery than anything has ever made me.Later on that day I went back to the "infinitely more powerful" amphetamines (as usual) and had an infinitely less powerful reaction (as usual). I have no idea how someone who isn't accustomed to powerful stimulants would keep from panicking and calling 911 if they had my experience -- I knew it would pass and chose to wait it out, which worked fine for me. Point is, different people really do react very, very differently to things. I'll never touch anything with yohimbe in it ever again. I don't imagine all their customers go through what I did, or they wouldn't have any customers at all.The truth of the matter is, you really won't know until you try it. Hopefully trying it doesn't kill you... but let's be honest. Sometimes people drop dead from something they didn't know they had a fatal allergy to. It's a risk that you have to accept if you put a foreign chemical in your body.It's a shame you had to go through that, Shakira, but it isn't necessarily the vendor's fault.