It depends on the mushroom. The common button mushrooms, shiitakes, and oyster mushrooms at your grocery store are not drugs. They’re food. But “magic mushrooms” containing the psychoactive compound psilocybin are classified as a Schedule I controlled substance under federal law in the United States, placing them in the same legal category as heroin and LSD.
The question usually comes up because the word “mushroom” covers an enormous range of species, and the answer changes dramatically depending on which one you’re talking about.
Psilocybin Mushrooms and Federal Law
Psilocybin, the active ingredient in roughly 200 species of fungi, is a Schedule I substance under the Controlled Substances Act. That’s the most restrictive category the federal government uses. Schedule I means the substance is considered to have a high potential for abuse, no currently accepted medical use, and no accepted safety for use even under medical supervision. The DEA confirmed this classification in its 2024 Drugs of Abuse resource guide, and no federal rescheduling has occurred.
Possessing, selling, or cultivating psilocybin mushrooms is a federal crime. The penalties vary depending on quantity and intent, but the legal status is unambiguous at the federal level: these mushrooms are drugs in every legal sense of the word.
How Psilocybin Works in the Body
When you eat a psilocybin mushroom, your body converts psilocybin into a compound called psilocin. Psilocin binds to a specific type of serotonin receptor in your brain. Research published in Neuropsychopharmacology confirmed that the intensity of psychedelic effects directly correlates with how much of that receptor gets activated. The more receptor sites psilocin occupies, the stronger the experience.
This is the mechanism behind visual distortions, altered sense of time, emotional shifts, and the feeling of “ego dissolution” that users describe. Psilocin also interacts weakly with a few other serotonin-related receptors, but the primary one is what drives the psychedelic experience. Importantly, psilocybin has a low level of toxicity according to the National Institute on Drug Abuse, meaning it has a low potential for causing life-threatening events like breathing failure or cardiac arrest. That doesn’t make it safe in all contexts, since psychological distress, accidents, and dangerous behavior during a trip are real risks.
Some States Have Changed the Rules
While psilocybin remains illegal federally, a handful of states and cities have carved out exceptions. Oregon voters passed Ballot Measure 109 in 2020, creating the nation’s first regulatory framework for supervised psilocybin services. Licensed facilitators can now administer psilocybin to adults in controlled settings. Colorado followed with a similar measure in 2022, and several cities, including Denver, Oakland, and Washington, D.C., have deprioritized enforcement of psilocybin possession laws.
None of these changes affect federal law. If you’re in Oregon using psilocybin at a licensed service center, you’re legal under state law but technically still violating federal law. In practice, the federal government has not intervened in state-regulated programs.
The FDA’s Interest in Psilocybin as Medicine
In a notable tension with its Schedule I status, the FDA granted psilocybin breakthrough therapy designation twice: once in 2018 for treatment-resistant depression and again in 2019 for major depressive disorder. Breakthrough therapy designation speeds up the development and review process for drugs that show substantial improvement over existing treatments.
A phase 2 trial published in the New England Journal of Medicine tested single doses of psilocybin in people with treatment-resistant depression. The group receiving a 25-milligram dose saw significantly greater reductions in depression scores compared to those receiving a tiny 1-milligram control dose over three weeks. The 10-milligram dose did not show a significant benefit. As of now, 134 clinical trials are listed exploring psilocybin for 54 potential medical conditions, but zero marketing approvals have been granted. Psilocybin is not an approved medication anywhere in the U.S.
Culinary Mushrooms Are Not Drugs
Regular edible mushrooms contain no psilocybin and produce no psychoactive effects. That said, they aren’t pharmacologically empty. Shiitake mushrooms contain compounds that support immune function. Reishi mushrooms are packed with bioactive molecules that have shown anti-inflammatory and liver-protective properties in lab studies. White button mushrooms contain compounds linked to anti-inflammatory effects and improved insulin function. Oyster mushrooms are rich in beta-glucans, a type of fiber that interacts with the immune system.
These compounds are categorized as nutraceuticals or bioactives, not drugs. The distinction matters: a bioactive compound in food can have measurable effects on your body without meeting the legal or pharmacological definition of a drug. You won’t get high, impaired, or arrested eating shiitake stir-fry.
What “Drug” Actually Means Here
Part of the confusion is that “drug” means different things in different contexts. Legally, a drug is any substance listed on a controlled substances schedule. Pharmacologically, a drug is any chemical that alters the body’s normal function when consumed. By the strict pharmacological definition, caffeine is a drug, alcohol is a drug, and even some compounds in ordinary mushrooms qualify as bioactive agents that change how your body works.
But in everyday conversation and in the eyes of the law, only psilocybin-containing mushrooms are “drugs.” The roughly 200 species that produce psilocybin are illegal to possess in most of the country. The thousands of other mushroom species, including every variety you’ll find at the supermarket, are simply food.