Chemical Composition Variability in Magic Mushrooms

Many factors are at play in creating the mysterious cocktail of psychoactive chemicals found in magic mushrooms.


Like everything in nature, magic mushrooms are subject to the effects of their surrounding environment. These variables (what Paul Stamets calls “a constellation of factors” 1) include temperature, soil conditions, humidity, competition for resources, and the impact of diseases and predators. Changes in one or more variables effect where magic mushrooms grow, when, how well, and the compounds they contain as well as the amounts of them.

The Compounds in Magic Mushrooms

Magic mushrooms contain a cocktail of compounds, some of which cause psychoactive effects in humans. Some of the known compounds in magic mushrooms are psilocybin, psilocin, norpsilocin, baeocystin, norbaeocystin, and aeruginascin. Also, different parts of a mushroom can have different quantities of compounds. For example, one study found the highest amount of psilocybin in the caps of Panaeolus subalteatus compared to the rest of the fruiting body.2

Variability in the Chemical Composition of Wild and Cultivated Magic Mushrooms

Several studies on wild magic mushrooms have revealed the high variability in the compounds they contain. These variations are seen not just from species to species but from batch to batch within a species. Also, studies are shedding light on how controlling growing conditions influences the number and type of active compounds in cultivated magic mushrooms.

Wild Magic Mushrooms

In 1982, researchers Bigwood and Beug noted a tenfold difference in the psilocybin content of Psilocybe cubensis collected in the wild.3 Another study tested 52 samples of wild Psilocybe semilanceata collected in Switzerland over 5 years. The psilocin content varied from 0.21 to 2.02% and baeocystin from 0.05 to 0.77%.4 Traces of psilocin were also present. The researchers determined that variability depended on the age of the mushrooms, their size, and the part of the fruiting body they tested. A study by Gartz found the psilocybin content of dried Psilocybe semilanceata varied from 0.19 to 1.34%.5 The mushrooms with the lowest mass had the highest concentration of psilocybin.

In 1988, Gartz found aeruginascin in ten fruiting bodies of Inocybe aeruginascens.6 He also noted a correlation between the amount of psilocybin, baeocystin, and aeruginascin in the fruiting bodies. Jensen et al. studied aeruginascin from I. aeruginascens collected in Potsdam, Germany.7 The mushrooms contained varying levels of psilocybin, baeocystin, norbaeocystin, and aeruginascin.

The table below shows data on the components in other magic mushrooms.

Table 1: Components in several species of dried Psilocybe mushrooms. Taken from the Paul Stamets book Psilocybin Mushrooms of the World.

Percent by Weight of Dried Mushroom Material
Species Psilocybin Psilocin Baeocystin References
P. azurescens 1.78 0.38 0.35 8
P. bohemica 1.34 0.11 0.02 9, 10
P. baeocystis 0.85 0.59 0.10 11, 12
P. tampanensis 0.68 0.32 n/a 10
P. hoogshagenii 0.60 0.10 n/a 13
P. stuntzii 0.36 0.12 0.02 11, 12

Cultivated Magic Mushrooms

Bigwood and Beug saw a fourfold difference in psilocybin content in Psilocybe cubensis grown on rye grain.3 Their work also revealed important findings regarding the amounts of psilocybin and psilocin in successive flushes (another word for the fruiting or harvesting periods) of cultivated P. cubensis. In general, there was no psilocin in the first and sometimes the second flush. The level of psilocin reached a maximum by the fourth flush. The level of psilocybin showed no upward or downward trend over the course of several flushes. However, it was variable by over a factor of four as fruiting progressed. Overall, the level of psilocybin was nearly always twice that of psilocin.

In 1989, Gartz found that increasing the tryptamine concentration in a cow dung-rice growing medium increased psilocin content in Psilocybe cubensis from 0.09% to 3.3% of the dried mushroom weight.14 Also, using high-performance liquid chromatography (HPLC) and thin-layer chromatography (TLC), Gartz discovered that the mushrooms grown on the tryptamine-enriched mixture contained only a small amount of psilocybin (0.01 – 0.2%).

The Synergy of Compounds in Magic Mushrooms – Limitless Potential for New Findings

Currently, scientists don’t understand (and are not studying) how the compounds in magic mushrooms interact with each other and with serotonin receptors in the brain, particularly 5-HT2A. It’s possible that allosteric modulation plays a role in the overall entourage effect.

Aeruginascin seems to modify the pharmacological action of psilocybin to give an always euphoric mood during the ingestion of mushrooms.6

The clinical trials currently being conducted by COMPASS Pathways are using pure psilocybin in psilocybin-assisted therapy for depression. By itself, psilocybin causes different effects that it would in the presence of the other compounds ingested when eating magic mushrooms. Evidence for this lies in the anecdotal experiences (like those on Erowid and BlueLight) of users reporting different effects from ingesting different species of magic mushrooms. Some of these effects are considered good or desirable such as feelings of euphoria and amazing visualizations. Other results are less desirable such as muscle weakness and paralysis.

No one knows how psilocybin-assisted therapy could improve if researchers had a better understanding of the interaction between all of the components in magic mushrooms. That’s not to say the clinical trials are not credible or important. What needs to be understood is that psilocybin is not the only active ingredient or prodrug in magic mushrooms. Research in this area needs to take a step back and gain a deeper understanding of the chemistry of magic mushrooms.


There are many variables controlling the type and amount of compounds found in magic mushrooms. As a result, these mushrooms have substantial variability in the concentration and types of chemicals they contain. The limited scientific studies done so far barely scratch the surface of understanding.

Eating magic mushrooms unleashes a chemical cocktail of potentially psychoactive components into the bloodstream, resulting in very different effects than ingesting pure psilocybin. Awareness of this concept in the scientific community is needed, followed by conducting more research into understanding the specific effects and interactions of magic mushroom components.

Barb Bauer Headshot

Barb is the former Editor and one of the founders of Psychedelic Science Review. She is currently a contributing writer. Her goal is making accurate and concise psychedelic science research assessable so that researchers and private citizens can make informed decisions.


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Dusty Miller
4 years ago

Yes! I think understanding the whole plant is so important. Sticking with the the pot analogy, working with the plant over time (generations) created big differences in potency and effect. ‘It’s not just THC’ now sounds obvious, but it’s not just psilocybin either folks!

3 years ago

I love that you are using sitings, and I think that should be mandatory so the readers could fact check. I will advice the author of this article to read this article again and then the sited articles, and you will see that you have changed between the data of psilocybin and psilocin.
This is important as to not to spread the wrong information and unintentionally have negative effects on the psychedelic movement.
Mush love <3

Last edited 3 years ago by Marius
1 year ago
Reply to  Marius

Sorry Marius, but it’s spelled “cite” and “citations”. A “site” is a physical location. God bless you for praising the citations, but, I don’t know how you came to understand their importance, and not get the spelling right!

  1. Stamets P, Weil A. Psilocybin Mushrooms of the World: An Identification Guide. First Edition. Berkeley, Calif: Ten Speed Press; 1996.
  2. Gartz J. Analyse der Indolderivate in Fruchtkörpern and Mycelien von Panaeolus subalteatus (Berk. & Br.) Sacc. Biochemie und Physiologie der Pflanzen. 1989;184(1-2):171-178. doi:10.1016/S0015-3796(89)80139-8
  3. Bigwood J, Beug MW. Variation of psilocybin and psilocin levels with repeated flushes (harvests) of mature sporocarps of Psilocybe cubensis (Earle) Singer. Journal of Ethnopharmacology. 1982;5(3):287-291. doi:10.1016/0378-8741(82)90014-9
  4. Brenneisen R, Borner S. The Occurrence of Tryptamine Derivatives in Psilocybe semilanceata. Zeitschrift für Naturforschung C. 2014;43(7-8):511–514. doi:10.1515/znc-1988-7-806
  5. Gartz J. Quantitative Bestimmung der Indolderivate von Psilocybe semilanceata (Fr.) Kumm. Biochemie und Physiologie der Pflanzen. 1986;181(2):117-124. doi:10.1016/S0015-3796(86)80079-8
  6. Gartz J. Analysis of aeruginascin in fruit bodies of the mushroom Inocybe aeruginascens. International Journal of Crude Drug Research. 1989;27(3):141-144.
  7. Jensen N, Gartz J, Laatsch H, Biotransformations F. Aeruginascin, a trimethylammonium analogue of psilocybin from the hallucinogenic mushroom Inocybe aeruginascens. Planta Medica. 2006;72(7):665. doi:10.1055/s-2006-931576
  8. Stamets P, Gartz J. A new caerulescent Psilocybe from the Pacific Coast of northwestern North America. Integration. 1995;(6):21-27.
  9. Gartz J, Moller GK. Analysis and Cultivation of Fruit Bodies and Mycelia of Psilocybe bohemica. Biochemie und Physiologie der Pflanzen. 1989;184(3):337-341. doi:10.1016/S0015-3796(89)80023-X
  10. Gartz J. Extraction and analysis of indole derivatives from fungal biomass. Journal of Basic Microbiology. 1994;34(1):17-22. doi:10.1002/jobm.3620340104
  11. Repke DB, Leslie DT, Guzmán G. Baeocystin in psilocybe, conocybe and panaeolus. Lloydia. 1977;40(6):566-578.
  12. Beug MW, Bigwood J. Psilocybin and psilocin levels in twenty species from seven genera of wild mushrooms in the Pacific Northwest, USA. Journal of Ethnopharmacology. 1982;5(3):271-285. doi:10.1016/0378-8741(82)90013-7
  13. Heim R, Hofmann A. La psilobybine et la psilocine chez les psilocybes et strophaires hallucinogenes. Les Champignons Hallucinogenes du Mexique. 1958; 6:258-267.
  14. Gartz J. Biotransformation of Tryptamine in Fruiting Mycelia of Psilocybe cubensis. Planta Med. 1989;55(3):249-250. doi:10.1055/s-2006-961995