20mg is an awful high dose. The usual dosage is between 75-1000 micrograms. 1000 still being awful high. (and 20 milligrams, is a _lot_ more than that!) Wonder if its a typo, of it they are just going balls out.
Every psychedelic I've taken has had an upper-bound beyond which increasing dose didn't really do much. Granted I've never taken astronomical doses of LSD but a "heroic dose" of psilocybin will take you places a "heroic dose" of LSD can't.
