Mescaline is a naturally occurring psychedelic found in several cactus species, most notably, Peyote(Lophophora williamsii) shown here and San Pedro(Trichocereus pachanoi). The cacti which contain mescaline are prepared by removing their ‘heads’ and drying them to make disk-shaped buttons. These buttons can be chewed or soaked in water to make a drink. Sometimes users grind the dried buttons to make capsules which can be swallowed. The effective dose of pure mescaline in a human is 300-500mg.
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