About this item THE FEEL GOOD HORMONE - 5-Hydroxytryptophan, made from the amino acid L-tryptophan with the help of vitamin B6, is a precursor to serotonin production. The amino acid tryptophan can be found naturally in protein foods such as turkey and milk. Serotonin is a vital neurotransmitter known as "the feel-good hormone." * SEROTONIN PRECURSOR - 5-HTP Synergy is a synergistic formula of 5-hydroxytryptophan (50 mg) and vitamin B6 (10 mg) for supporting overall neurotransmitter metabolism by providing precursors of serotonin. * WELL ABSORBED - 5-HTP is well absorbed from an oral dose, with about 70% ending up in the bloodstream. Absorption of 5-HTP is not affected by the presence of other amino acids; therefore, it may be taken with meals without reducing its effectiveness. * HIGHER STANDARDS. BETTER RESULTS - Designs for Health maintains a strict, no-compromises approach to quality raw material selection. We never cut corners with substandard ingredients. This product is Non-GMO, Gluten-Free, and Vegetarian-friendly. OVER 50,000 DOCTORS AGREE - Designs for Health is the physician's choice for top quality professional strength supplements since 1989. Our "Science First" philosophy ensures our products are based on the most recent research and use the highest quality raw ingredients. #1 IN CONSUMER SATISFACTION - Designs for Health was voted #1 in Consumer Satisfaction in 2016 and 2017 in a Consumer Labs survey of Healthcare Practitioner Brands.