Oregon
The first state to license psilocybin service centers, open since 2023. Adults 21+ attend sessions on-site with a licensed facilitator. No prescription or diagnosis required.
Oregon Psilocybin ServicesPsilocybin research, explained
The science of psilocybin is good news.
Two positive Phase 3 trials. An FDA filing underway. Legal therapy programs in three states. Here is what the research on magic mushrooms actually shows, in plain English, with every claim sourced.
- Name
- Psilocybin (4-PO-DMT)
- Formula
- C₁₂H₁₇N₂O₄P
- Molar mass
- 284.25 g/mol
- Target
- Serotonin 5-HT2A receptor
2positive Phase 3 trials of psilocybin for treatment-resistant depression
39%of patients responded after two doses and stayed better through 26 weeks
$2.8Bpaid by Eli Lilly for psychedelic developer AtaiBeckley, closed Sept. 2026
3states with legal psilocybin programs: Oregon, Colorado, New Mexico
What psilocybin may treat
Sorted by strength of evidence
Some uses are backed by large controlled trials. Others rest on small studies and personal reports. We label which is which, so you can tell a breakthrough from a hunch.
Phase 3 evidence
Strongest
Large, placebo-controlled trials. FDA filing underway.
Treatment-resistant depressionTwo Phase 3 trials met their goals, with benefits lasting at least six months for many patients.Read the research
Major depressive disorderRandomized trials at Johns Hopkins and elsewhere found fast, large reductions in symptoms.Read the research
Randomized trials
Promising
Controlled studies with encouraging results. Needs larger trials.
Cancer-related distressSingle sessions reduced depression and anxiety in people with life-threatening cancer.Read the research
Alcohol use disorderA 2022 trial found fewer heavy drinking days compared with placebo.Read the research
PTSDLate-stage trials are now underway after positive early data.Read the research
Early or anecdotal
Unproven
Small pilots and personal reports. Not established treatments.
Smoking cessationA small pilot reported high quit rates. Larger trials are underway.Read the research
Cluster headachesStrong patient reports and small trials. Results so far are mixed.What we know
Anorexia and OCDTiny early studies only. Treat any claims with caution.What we know
How it works
A key that fits your serotonin lock
Psilocin looks so much like serotonin that it slots into the same receptors. For a few hours, rigid brain networks loosen and regions that rarely talk start communicating. Lab studies suggest the brain keeps building new connections for weeks afterward.
What shrooms do to your brain- Psilocybin becomes psilocinEnzymes in your gut and liver remove the phosphate group.
- Psilocin activates 5-HT2A receptorsBlocking this receptor blocks the psychedelic effects in humans.
- Brain networks loosenThe default mode network, tied to rumination, quiets down.
- New connections formAnimal studies show neurons growing new spines that last for weeks.
Where psilocybin therapy is legal
Three states have opened the door
These programs run under state law with licensed facilitators. They are the only legal way for adults to take psilocybin outside a clinical trial in the U.S.
Colorado
Licensed healing centers serve adults 21+ under the Natural Medicine Health Act, approved by voters in 2022. Personal possession and growing by adults is decriminalized.
Colorado healing centersNew Mexico
The Medical Psilocybin Act, signed in April 2025, creates physician-referred treatment for serious conditions. Producer permits opened in August 2026, and the first patients are expected in late 2026 or 2027.
Program statusPsilocybin remains Schedule I under federal law. A petition to move it to Schedule II has been under federal health review since August 2025.
Latest research and news
Start here
Psilocybin for Depression: What the Research Shows in 2026
Two Phase 3 trials, an FDA filing, and results that last months after one or two sessions.
What Do Shrooms Do to Your Brain?
Serotonin receptors, quieter brain networks, visuals, and new neural connections.
Eli Lilly's $2.8B Psychedelic Bet: What It Means for Psilocybin
The maker of Prozac now owns a psychedelic pipeline. Here is why that matters.
Safety first
Powerful medicine deserves respect
Psilocybin is not physically toxic at typical doses, but it can bring on intense fear, confusion, or distress. Clinical trials screen people carefully and keep trained staff in the room for the whole session.
Need to talk during or after an experience? Fireside Project offers free psychedelic peer support. In a crisis, call or text 988.
Talk to a doctor first, and generally avoid psilocybin, if you:
- Have a personal or family history of schizophrenia, psychosis, or bipolar disorder
- Have heart disease or uncontrolled high blood pressure
- Take lithium, certain antidepressants, or other medications that interact
- Are pregnant or breastfeeding
- Are under 21, or in a place or situation where you would not feel safe
Quick answers
Psilocybin FAQ
What is psilocybin?
Psilocybin is a naturally occurring compound made by more than 200 species of mushrooms, often called magic mushrooms. Your body converts it into psilocin, which activates serotonin 5-HT2A receptors in the brain and produces a psychedelic experience lasting roughly four to six hours.
Is psilocybin legal in the United States?
Psilocybin is still a Schedule I controlled substance under federal law. Oregon and Colorado run state-licensed programs where adults 21 and older can take psilocybin with a trained facilitator, and New Mexico passed a medical psilocybin law in 2025 with the first patients expected in late 2026 or 2027.
Is psilocybin FDA approved?
Not yet. Compass Pathways is completing a rolling New Drug Application for COMP360, its synthetic psilocybin for treatment-resistant depression, with final submission expected in Q4 2026 and a possible launch in the first half of 2027, subject to FDA approval and DEA rescheduling.
How long do shrooms last?
Effects typically begin 20 to 40 minutes after eating mushrooms, peak around 60 to 90 minutes, and fade over four to six hours. Many people feel tired or reflective for the rest of the day.
Is psilocybin addictive?
Psilocybin has low potential for addiction. It does not produce compulsive use the way opioids or stimulants do, and tolerance builds so quickly that repeated use over consecutive days has much weaker effects.