Psilocybe Cubensis is a medium strength psilocybian mushroom consisting of approximately .63% psilocybin and .60% psilocin in wild mushrooms. Indoor cultivated mushrooms tend to have higher concentrations. Note that potency of mushrooms can vary greatly from one batch to the next. The following chart shows approximate oral dosages for (dried) Psilocybe cubensis in grams.

Oral P. cubensis Dosages Threshold .25 g 1/100 oz Light .25 - 1 g 1/100 - 1/28oz Common 1 - 2.5 g 1/28 - 1/10oz Strong 2.5 - 5 g 1/10 - 1/6oz Heavy 5 + g 1/4oz +

Onset : 10 - 40 minutes (when chewed and held in mouth) Onset : 20 - 60 minutes (when swallowed on empty stomach) Duration : 2 - 6 hours Normal After Effects : up to 8 hours

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Psilocybin is the major psychoactive agent in psilocybian mushrooms. The main difference between psilocybin and psilocin is their relative stabilities...psilocin is much more easily oxidized, so deteriorates much more quickly than psilocybin. The following chart shows approximate oral dosages of psilocybin in mg.

Oral Psilocybin Dosages Threshold 2 mg Light 2 - 4 mg Common 4 - 8 mg Strong 8 - 20 mg Heavy 20 + mg

Onset : 15 minutes (when held in mouth) Duration : 2 - 6 hours Normal After Effects : up to 8 hours

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Psychedelics Encyclopedia, by Peter Stafford
Psilocybin Mushrooms of the World, Paul Stamets