The group also has connected patients to doctors and therapists who oversee their use of the drug.
These trial cases come amid mounting interest from researchers and investors, as well as a public push to reconsider bans on psilocybin, LSD, DMT, mescaline and other mind-altering substances such as MDMA, commonly known as ecstasy.
The US state of Oregon legalized psilocybin for therapeutic use last November.
Psychedelics have been used by indigenous peoples for millennia, but Western researchers only started delving into their properties and potential uses in earnest in the middle of last century.
But that work came grinding to a halt when the substances quickly became symbols of the anti-establishment counter-culture movement of the 1960s and were banned.