What is 5-Hydroxytryptophan?
5-Hydroxytryptophan is a naturally-occurring amino acid. 
Though 5-HTP is found in food only in insignificant quantities, it is a chemical involved intermediately in the metabolism of tryptophan, an amino acid found in turkey, milk, potatoes, pumpkin, and various greens. 
5 Hydroxy L Tryptophan
L 5 Hydroxy Tryptophan