L-Tryptophan is an essential amino acid for humans for the synthesis of melatonin and seratonin, hormones regulating sleep, positive mood, and the immune system. The body uses L-Tryptophan to make 5-HTP, which is converted into seratonin. 5-HTP can also be supplemented directly, if desired. Our 5-HTP is from the seeds of Griffonia simplicifolia plant, from Africa. Our Standardized Griffonia Extract is made under strict European quality standards which are comparable to Over-The-Counter drug standards in the US. We source our herbs from an ISO 9000 certified supplier in Europe. Our Standardized Griffonia Extract provides optimal levels of naturally occurring L-5-hydroxyTryptophan. Our L-5-HTP is formulated with important nutrients to optimize its effectiveness - Vitamin C and B-6 aid the conversion of tryptophan to serotonin in the body. We also offer L-Tryptophan, 500 mg; see item# 8583. View Product Information Sheet (PDF)