Terrance McKenna thinks that the Soma decoction was in fact, a combination of water, cannabis indica, and the psilocybin mushroom. McKenna bases this theory on the fact that the Amanita is widely known to be a poisonous fungus which does not grow in South Asia and that further, Amanita has not been demonstrated to produce a psychedelic experience. Timothy Leary and Richard Alpert ran the Harvard Psilocybin Project, carrying out a number of experiments concerning the use of psilocybin in the treatment of personality disorders and other uses in psychological counseling. Psilocybin is a known hallucinogenic substance which produces the same effects as described in the Vedas. The sacramental basis of the Vedic Religion was the preparation and consumption of a decoction obtained by mixing the juices of various psychoactive ingredients, one of which may have been Cannabis Indica, a species of weed, or a beverage prepared by extracting the juice from the Amanita Muscaria, a magic fungus, or from Psilocybin, which together produced the substance “Soma” mentioned on numerous occasions in South Asian sacred scripture.