Surprising Variability in Tryptamine Profiles of <i>Psilocybe cubensis</i> Fruiting Bodies: Inter- and Intra-Strain Differences Across 14 Strains Cultivated Under Controlled Conditions.

Abstract

Psilocybin-producing mushrooms exhibit considerable biochemical diversity, yet the extent of variability among strains within a single species under standardized conditions remains insufficiently characterized. In this study, we quantified psilocybin, psilocin, baeocystin, norbaeocystin, aeruginascin, and norpsilocin in the fruiting bodies of 14 distinct strains of <i>Psilocybe cubensis</i>. The mushroom strains were cultivated, dried, extracted, and analyzed under uniform laboratory conditions. Despite strict methodological standardization, total tryptamine concentrations varied by more than 7.8-fold among strains (from 2.62 to 20.65 mg/g), with psilocybin consistently emerging as the dominant compound. Analysis of individual fruiting bodies within the selected strains revealed substantial intra-strain variability, with coefficients of variation for psilocybin ranging from 12.81% to 23.39% between individual fruiting bodies. These findings demonstrate that both inter- and intra-strain biochemical heterogeneity persist even under controlled conditions, underscoring the challenges of standardizing whole mushroom preparations for research or therapeutic use. Our results highlight the importance of strain selection, rigorous chemical profiling, and dosing precision in future pharmacological and clinical applications of <i>P. cubensis</i>.

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