The amino acid L-5-Hydroxytryptophan (5-HTP) is created from L-Tryptophan in the body, and is a precursor to serotonin and melatonin. This 5-HTP is derived from a plant source, and is carefully tested to ensure its purity and to guarantee the absence of contaminants.
 
Ingredients: L-5-Hydroxytryptophan, Microcrystalline Cellulose (E460i), L-Leucine. Capsule Shell: Hydroxypropyl Methylcellulose (E464)

Additives: Microcrystalline Cellulose (E460i), capsule shell: Hydroxypropyl Methylcellulose (E464)