The Somahuasca hypothesis posits that the drink Soma of ancient indian and Haoma of ancient iranian people contained a mixture of DMT-like alkaloids and MAO-inhibitting entheogens like harmaline. It extends the hypothesis of Flattery & Schwartz, who identified Haoma with Peganum Harmala, with a second ”invisible” component present in the milk, with which the crushed plant is to be mixed in the culminating phase of both Vedic and Avestic Ritual. In its more specific form, the hypothesis suggests that milk, and especially colostrum milk, given by cows who have grazed high quantities of Phalaris grasses, shall contain non-negligeable amounts of psychoactive tryptamines able to induce altered state of consciousness in those who have consumed such a mixture in appropriate set and setting. The epistemologic advantages of the hypothesis hereby proposed are both its experimental falsifiability as well as its ability to offer an answer to the question: ”Why was knowledge about Soma lost?”.