Psilocybin, the active ingredient in magic mushrooms, can restore fear extinction and help treat post-traumatic stress disorder (PTSD). The study found that psilocybin promotes the growth of new neurons and synapses in the hippocampus, a brain region involved in memory formation, and was found to reverse the decline in proteins associated with neuroplasticity and fear extinction. The findings provide a promising potential for using psilocybin in the treatment of PTSD.