Erowid Psychoactive Vaults - Information on entheogens, psychedelics, and hallucinogens including traditional, spiritual, and responsible use, chemistry, effects, experiences, images, research, legislation, media coverage, bibliographies and links.
The Albert Hofman Foundation - Homepage of the inventor of LSD. Contains articles, information about projects, reviews, and a virtual museum tour..
Ask Dr. Shulgin - Information about psychedelics, entheogens, empathogens (MDMA, Ecstasy), from a pharmacologist and chemist..
Cluster Busters - Information regarding the use of hallucinogenic substances for the treatment of cluster headaches and other vascular headaches..
HPPD: Hallucinogen Persisting Perception Disorder - Information, treatment, and forums for sufferers of HPPD (Hallucinogen Persisting Perception Disorder), also known as flashbacks, which happens to some users of psychedelic drugs..
HPPDonline.com - Information and message boards for people with Hallucinogen Persisting Perception Disorder (flashbacks)..
The Psychedelic Library - Menu of articles, research papers, books, and essays on LSD, peyote, psilocybin, and the use of psychedelic drugs in research, therapy, religion and personal growth..
Serendipity: Psychedelics - Articles on psychedelic mushrooms and DMT (with field notes on DMT experiences); LSD and Ketamine trip reports; preservation of dried psilocybin mushrooms; links to other documents concerning psychedelics..
Status of Ololiuhqui in Mexico - Describes picietl, peyotl, teonanactl, and ololuihqui, four divinatory plants. Article by R. Gordon Wasson..
Trip Magazine - A mainstream publication for about psychedelics..
Tryptamind - Resource on psychoactive, psychedelic and hallucinogenic plants and the pharmacological effects of their active chemical constituents..