This review explores how psychedelic drugs like LSD and psilocybin work through the body’s natural stress-response systems, particularly two brain chemicals called oxytocin and vasopressin. It explains why psychedelics initially cause uncomfortable feelings like nausea and anxiety, but these are followed by improved mood, sociability, and emotional healing. The theory suggests that this initial ‘stress’ response triggers the body’s natural healing mechanisms, similar to how physical exercise makes you uncomfortable initially but builds strength over time.