Psilocybin mushrooms (also called psilocybian mushrooms) are fungi that contain the psychedelic substances psilocybin and psilocin, and occasionally other psychoactive tryptamines. There are multiple colloquial terms for psilocybin mushrooms, the most common being magic mushrooms or shrooms.

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As with many psychoactive substances, the effects of psychedelic mushrooms are subjective and unpredictable. A common misconception, even seen in the professional environment, is that the effects experienced from psilocybin are due to a poisonous nature of the compound, yet the National Institute for Occupational Safety and Health, a branch of the Center for Disease Control, rated psilocybin less toxic than Aspirin. The intoxicating effects of psilocybin-containing mushrooms typically last anywhere from 3 to 7 hours depending on dosage, preparation method and personal metabolism.

The sensory effects are often the most dramatic of the experience. Common doses cause effects such as a noticeable feeling of heaviness, relaxation, enhancement and contrasting of worldly colors, strange light phenomena (such as auras around lights sources), surfaces that seem to ripple, shimmer, or breathe, and other such visual hallucinations. The sense of smell too can become heightened.

Higher doses elicit a variety of intensified and distinct perceptual changes: complex open and closed eye visuals of form constants or images, objects that warp, morph, or change solid colors (juxtaposed with the free-flowing colors of LSD), a sense of melting into the environment, trails behind moving objects, and auditory hallucinations.

Psilocybin and psilocin are listed as Schedule I drugs under the United Nations 1971 Convention on Psychotropic Substances. Parties to the treaty are required to restrict use of the drug to medical and scientific research under strictly controlled conditions... or to at least say they are. Celebrate the high potential for abuse and lack of a recognized medical use for psilocybin with our Magic Mushroom t-shirt!