Here’s how you know Please see this section for more information. jesus magic mushrooms The key ingredient in magic mushrooms is psilocybin. When psilocybin is taken, it’s converted in the body to psilocin, which is the chemical with the psychoactive properties.2 Stamets, Paul. 1996. Psilocybin Mushrooms of the World: An Identification Guide. Berkeley: Ten Speed. How long a drug can be detected for depends on how much