... %, 99% HPLC In African folk medicine, Griffonia Seed is reputed to be an aphrodisiac, as well as an ... raises serotonin levels in the brain. Serotonin is important in regulating brain chemistry and is especially important in problems such as depression, insomnia, ... Griffonia simplicifolia seed, is an amino acid that is the intermediate step between tryptophan and the important brain chemical serotonin. ...