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The Substance: Albert Hofmann's LSD (2012)
- Genres: Documentary, Biography, History
- Released: 2011
- Directors: Martin Witz
- Casts: Trevor J. Roling, Hanspeter Müller, Mario Scarabelli, Albert Hofmann, Stanislav Grof, Martin A. Lee, James S. Ketchum, Franz X. Vollenweider, Ken Kesey, Carolyn Garcia, Timothy Leary, Ralph Metzner, Nick Sand, Ronald Reagan, John Lennon, Paul McCartney, Mick Jagger, Grateful Dead








