Serotone 5-HTP provides the natural amino acid, 5-HTP (5-hydroxytryptophan) which helps support production of feel good neurotransmitters and plays a role in a range of body functions from mood to the sleep cycle. This formula also provides B vitamins and zinc, essential co-factors, which are needed to help 5-HTP to be used effectively in the body. Vitamins B3, B6, biotin and folic acid help with normal psychological function 5HTP is found naturally in the Griffonia simplicifolia seed which is a woody climbing shrub native to West Africa and Central Africa. 100mg 5-HTP per capsule. Sutable for Vegetarians and Vegans.