1 12 inch cutting if it's good stuff. You can eat it, but that's alot of fucking cactus. Tea is easier, still kinda nasty, but worth it. Dopamine is a neurotransmitter, it is not a controlled substance ( got a list right in front of me ) Not sure if it's found in banana peals (kinda dought it) but even if it is I don't think it will cross the blood/brain barrier. Could be wrong on that. But I do know you CAN extract mecaline with chemical you get from maybe not a grocery store, but wal-mart or a hardware store. Naoh is a fancy name for lye. I've done an acid/base (which is how you extract mescaline) a few hundred times using Red Devil lye. Not with mescaline, but extraction of a freebase as the hcl salt, not complicated, a thousand tweaked out morons do it every day, and most of them have absolutely no understanding of the chemistry.