NATURAL FACTORS - 5HTP - 60 Tablet(s) - NPN: 80006176 -- Depression: quick acting, few side effects Helps to promote and maintain sleep May help migraines due to low serotonin levels Fibromyalgia: studies show good results Helps promote a feeling of fullness for healthy weight loss 5-Hydroxytryptophan (5-HTP) is an amino acid that is the middle step between tryptophan and the important brain chemical serotonin. Considerable scientific evidence indicates that low serotonin levels are linked to a number of common conditions including depression, obesity, fibromyalgia and headaches.