Quick answer: Every authority we found that has addressed whether mushroom spores contain psilocybin says they do not. The DEA’s January 2, 2024 letter does not test that claim; it sets a rule. Spores that contain no psilocybin or psilocin are not controlled under federal law, and material that does contain them, “for example, upon germination,” is a controlled substance.
The honest caveat is that the science behind the claim is thin. We could not find a peer-reviewed study that measured psilocybin in dormant Psilocybe spores. The claim rests on statements from regulators, such as the Oregon Health Authority, and on the fact that no one has shown otherwise.
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Intended use and disclaimer. We sell Psilocybe cubensis spore syringes for microscopy, taxonomy and educational use only. This page is general information, not legal advice. Laws change, so check the current law in your state, and ask a lawyer licensed there if you need to know how it applies to you.
In this guide
- What the DEA’s 2024 letter says
- What the letter does not say
- Do mushroom spores contain psilocybin? What the evidence shows
- Where psilocybin is made
- Why germination is the legal line
- What this means in your state
- Frequently asked questions
- Sources
What the DEA’s 2024 letter says
On November 29, 2023, attorney Michael McGuire wrote to the DEA asking how the Controlled Substances Act treats “magic mushroom” spores. The reply came from Terrence L. Boos, chief of the Drug & Chemical Evaluation Section in the agency’s Diversion Control Division, and it is dated January 2, 2024.
The letter is short. It notes that psilocybin and psilocin are listed in Schedule I, then gives the rule in two sentences. The first: “If the mushroom spores (or any other material) do not contain psilocybin or psilocin (or any other controlled substance or listed chemical), the material is considered not controlled under the CSA.” The second: “However, if at any time the material contains a controlled substance such as psilocybin or psilocin (for example, upon germination), the material would be considered a controlled substance under the CSA.”
What the letter does not say
Read closely, the letter never states that spores contain no psilocybin. It says “if.” The DEA did not report testing any spores, and the letter does not cite a study. It sets out a legal test based on content, and it leaves the chemistry to whoever has to apply the test.
That matters less in practice than it might seem. The federal schedule has always worked by content: a material is controlled if it contains a listed substance, and the letter simply applies that rule to spores. What the letter adds is the germination example, which tells you where the DEA thinks the line falls. Our post on why spores are sold for microscopy only explains how vendors build their policies around that line.
Do mushroom spores contain psilocybin? What the evidence shows
The claim that Psilocybe spores contain no psilocybin is repeated widely, and the clearest statement comes from a regulator. The Oregon Health Authority, which regulates Oregon’s licensed psilocybin program, told KGW’s Verify fact-check team that spores “do not contain detectable psilocybin until they begin producing mycelium.”
What we could not find is the measurement behind those statements. We searched the published literature for a study that extracted dormant Psilocybe spores and tested them for psilocybin or psilocin, and found none. Psychedelic Science Review, in a 2021 article on the subject, put it plainly in its subtitle: on the question of why the spores lack psilocybin, “No one knows.”
The fairest summary is that the authorities who have addressed the question say spores contain no detectable psilocybin, no published result contradicts them, and no one has published the direct test either. We will update this page if that changes. Our guide to what mushroom spores are explains why a spore is such a different object from the mushroom that made it.
Where psilocybin is made
Psilocybin is not something a mushroom absorbs; the fungus builds it with its own enzymes. In 2017, Janis Fricke, Felix Blei and Dirk Hoffmeister reported in Angewandte Chemie that they had characterized four psilocybin biosynthesis enzymes, named PsiD, PsiK, PsiM and PsiH, and had made psilocybin in the lab from 4-hydroxy-L-tryptophan using three of them. Their abstract describes psilocybin as the natural product of Psilocybe mushrooms.
That work does not answer the spore question, but it makes the question testable. A lab could check dormant spores for the compounds, or for the activity of those enzymes. Until someone publishes that, the Oregon statement quoted above is the closest thing to a direct answer: the compounds appear once the spore begins producing mycelium.
Why germination is the legal line
A spore is a single dormant cell. When it germinates, it grows into mycelium, the network of threads that is the working body of the fungus, and both the DEA letter and the Oregon statement place the appearance of psilocybin at that point. From then on the material contains a Schedule I substance.
Federal law also treats growing as manufacturing. The Controlled Substances Act defines “production” to include planting, cultivating, growing and harvesting a controlled substance, and “manufacture” includes production (21 U.S.C. § 802). Germinating a Psilocybe spore is the first step of that process. This is why spores are sold for study, why a spore syringe is sold for microscopy, and why we do not sell anything for growing.
What this means in your state
Most states follow the same content-based approach as federal law: their schedules list psilocybin and psilocin and say nothing about spores. In those 46 states, spores are legal to buy and own for microscopy.
Four states did not wait for the chemistry. Georgia lists “mushroom spores which, when mature, contain either psilocybin or psilocin” as a dangerous drug, and Idaho puts spores and mycelium in Schedule I. California restricts cultivating spores with intent and selling or importing them to facilitate that, and Florida has made selling, transporting, importing or giving away spores a misdemeanor since July 1, 2025. In those states, whether a spore contains psilocybin does not matter, because the statute names the spore. We do not ship to any of the four. Our 50-state guide has every statute, and our post on psilocybin FDA approval covers what a federal approval would and would not change.
Frequently asked questions
Do mushroom spores contain psilocybin?
Not in any detectable amount, according to the Oregon Health Authority. We found no published study that directly measured psilocybin in dormant spores, so the claim rests on expert and regulatory statements rather than a published test.
What exactly did the DEA’s 2024 letter say?
It said spores or other material that do not contain psilocybin or psilocin are not controlled under the Controlled Substances Act. It added that material which contains psilocybin or psilocin, for example upon germination, is a controlled substance.
Who wrote the DEA letter, and to whom?
Terrence L. Boos, chief of the DEA’s Drug & Chemical Evaluation Section, signed it on January 2, 2024. It answered a November 29, 2023 inquiry from attorney Michael McGuire.
Does mycelium contain psilocybin?
The Oregon Health Authority says psilocybin appears once a spore begins producing mycelium, and the DEA letter gives germination as its example of when material becomes a controlled substance. That is why germinated material is treated as controlled.
Are spores legal because they contain no psilocybin?
Under federal law and in 46 states, yes. Georgia, Idaho, California and Florida name spores in their own statutes, so the content question does not decide the matter there.
Is a spore syringe a controlled substance?
Not under federal law or in 46 states. It holds spores in sterile water, and the spores contain no detectable psilocybin. In Georgia and Idaho the spores themselves are banned.
Sources
- DEA Drug & Chemical Evaluation Section letter on mushroom spores, January 2, 2024 (PDF)
- Marijuana Moment, “DEA Confirms That Psychedelic Mushroom Spores Are Federally Legal Prior To Germination” (January 4, 2024)
- KGW Verify, “No, uncultivated mushroom spores do not contain psilocybin” (Oregon Health Authority statement)
- Psychedelic Science Review, “Why Don’t Magic Mushroom Spores Contain Psilocybin?” (July 27, 2021)
- Fricke J, Blei F, Hoffmeister D. “Enzymatic Synthesis of Psilocybin.” Angewandte Chemie International Edition 56(40):12352–12355, 2017 (PubMed) and publisher’s page
- 21 U.S.C. § 802, definitions of “manufacture” and “production”
- O.C.G.A. § 16-13-71, Idaho Code § 37-2705, California Health and Safety Code § 11391 and Florida Statutes § 500.75
Psilocybe cubensis spore syringes
Our Psilocybe cubensis spore syringes are 10 cc syringes filled in our ISO-7 cleanroom. Each one comes with a sterile needle. Orders placed by 1 p.m. Eastern on a weekday ship the same day, to the 46 states where spores are legal. You get free shipping on orders over $100, up to 40% off with our 3-, 5- and 10-packs, and a 30-day warranty. They are sold for microscopy and taxonomy use only.
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