The Substance: Albert Hofmann's LSD Online

Trevor J. Roling - narrator in English version (voice) , Hanspeter Müller - narrator in German version (voice) (as Hanspeter Müller-Drossaart) , Mario Scarabelli - narrator in Italian version (voice) , Albert Hofmann - Self (archive footage) , Stanislav Grof - Self - psychiatrist, Martin A. Lee - Self - author, James S. Ketchum - Self - U.S. Army Colonel (Retired), Medical Corps, Franz X. Vollenweider - Self - neuroscientist, University of Zürich, Ken Kesey - Self (archive footage) , Carolyn Garcia - Self - Merry Pranksters, Timothy Leary - Self (archive footage) , Ralph Metzner - Self - psychologist, Nick Sand - Self - Millbrook Mansion, Ronald Reagan - Self (archive footage) , John Lennon - Self (archive footage)