Variation of psilocybin and psilocin levels with repeated flushes (harvests) of mature sporocarps of Psilocybe cubensis (earle) singer
Journal of Ethnopharmacology May 1, 1982 Jeremy Bigwood, Michael W. Beug 42 citations
In controlled cultures of Psilocybe cubensis mushrooms, psilocin levels were generally zero in the first or second fruiting flush and reached a maximum by the fourth flush. Psilocybin levels were nearly always at least twice those of psilocin, showed no consistent trend across flushes, but varied up to fourfold. Mushroom samples from outside sources had psilocybin levels varying more than tenfold between collections.