Psychedelics like lysergic acid diethylamide (LSD) have a complicated history of being used as potential treatments for mental illness. Researchers studied LSD therapy in the 1950s and 1960s, and published numerous clinical papers involving more than 40,000 patients. The Controlled Substances Act of 1970 then prohibited the drug's medical use.
The "tapeworm diet" appeared in the early 20th century. Once thought to be an effective way to lose weight, but some tapeworm species are linked with malnutrition, nausea, vomiting, diarrhea, anemia and other health risks.