Do magic mushrooms decrease serotonin levels?

No, magic mushrooms, which contain the psychoactive compound psilocybin, do not decrease serotonin levels. Instead, they primarily act as agonists at serotonin receptors, particularly the 5-HT2A receptor, leading to altered perception and mood. While their effects can influence serotonin activity temporarily, they do not result in a net decrease in serotonin levels in the brain.