In pure form it is a colorless, odorless, tasteless solid. LSD is typically either swallowed (oral) or held under the tongue (sublingual), usually on a substrate such as absorbent blotter paper, a sugar cube, or gelatin.In its liquid form, it can also be administered by intramuscular or intravenous injection.SD is very potent, with 20–30 µg (micrograms) being the threshold dose. Hofmann discovered the psychedelic properties of LSD in 1943. It was introduced commercially in 1947 by Sandoz Laboratories under the trade-name Delysid as a drug with various psychiatric uses.