Mescaline, or 3,4,5-trimethoxyphenethylamine, is a naturally occurring psychedelic alkaloid of the phenethylamine class, known for its hallucinogenic effects comparable to those of LSD and psilocybin.
It occurs naturally in the peyote cactus (Lophophora williamsii),[1] the San Pedro cactus (Echinopsis pachanoi),[2] the Peruvian torch (Echinopsis peruviana),[3] and in a number of other members of the Cactaceae plant family. It is also found in small amounts in certain members of the Fabaceae (bean) family, including Acacia berlandieri.[4]