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But many are psychoactive compounds, such as psilocybin and psilocin.

Psilocybin and psilocin, the psychoactive compounds found in nearly all species of Psilocybe, have shown promise as a treatment for conditions including PTSD, depression, and for easing end-of-life care.

They contain other compounds like psilocin and a dozen or more other active ingredients.

Beckley Psytech, also UK-based, is looking at the intravenous administration of psilocybin's biologically active metabolite, psilocin, which would bring down the length of the trip to about an hour and a half.

"It's a novel and unusual molecule in that it bears the ring substituents of both 5-MeO-DMT and psilocin — so it's a kind of hybrid of both molecules," Gallimore told Salon in an email.