Pure psilocybin, administered in clinical trials, is a single molecular entity, a white powder, derived from mushrooms like Psilocybe cubensis.

“So they reive pure psilocybin. So the mushroom, and there are many species... People have taken mushrooms in the United States, it's most likely so Psilocybe cubensis. They're easy to grow. They grow in cow patties. It's easy for anybody to grow 'em in their closet. It doesn't take a 1,000 watt light, like cannabis. It takes like a little 10 watt light bulb and a Tupperware bin. So those are what... Those are the types of mushrooms that people typically take. We're not administering those. Psilocybin is the compound. You could draw a molecule of psilocybin, again, based on the tryptamine structure, that's a single molecular entity. So it's a white powder.”