Dietary Supplement 5-Hydroxytryptophan Emotional Well-Being Purity & Potency Guaranteed Supplementing with 5-HTP provides natural support for emotional well-being, and caplets are enteric coated to minimize gastric discomfort and optimize absorption. Natural Factors amino acids are the highest quality pharmaceutical grade products available. Recommended by Dr. Michael Murray, one of the world's leading experts on natural medicine. Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada.