Owsley acid is a term used to describe a potent form of LSD, a hallucinogenic drug. The term was popularized in the 1960s by the Grateful Dead's sound engineer, Owsley Stanley, who was known for producing high-quality LSD. Synonyms for Owsley acid include blotter acid, dose, tab, trip, Lucy, and acid. Other variants of LSD include liquid acid, microdots, and gel tabs, each of which vary in potency and duration of effects. LSD is a Schedule I controlled substance in the United States, and its possession and use is illegal. Despite this, the drug continues to be popular among certain subcultures and can have profound and potentially dangerous effects on the mind and body.