Mescaline is a naturally occurring psychedelic compound found in certain cacti, most notably the Peyote cactus and the San Pedro cactus. It has been used for thousands of years in various indigenous cultures for spiritual and religious ceremonies. Mescaline affects the brain's serotonin receptors, leading to altered perceptions, enhanced sensory experiences, and changes in mood. The effects of mescaline typically begin within an hour of ingestion and can last for up to 12 hours. Users may experience vivid visual hallucinations, a sense of interconnectedness, and profound introspection. While mescaline is considered less potent than other psychedelics like LSD or psilocybin, it remains a subject of interest in both recreational and therapeutic contexts.