About this item Mood Support - As a precursor to serotonin, 5-HTP may support responses to everyday stressors in already healthy individuals.* Encourage Restful Sleep - 5-HTP is also a precursor of melatonin, which plays an important role in supporting restful sleep and relaxation.* Purity, Quality, Potency - No fillers, binders, preservatives, artificial colors or flavors. Vegetarian capsules. No gluten, egg, peanuts, tree nuts, or magnesium stearate. Supplements arrive in BPA-Free, recycled amber bottles that protect from light contamination. Synergistic Formula - We combine our naturally derived 5-HTP with activated vitamin B-6 as active P-5-P, an important cofactor in serotonin metabolism.* Physician's Choice - The health care professional's choice for high-quality supplements since 1984. We base our products on the latest wellness research and clinical studies, and use third-party testing for all incoming, in-process, and finished product. Products you can trust, at an exceptional value.