Product Review

L-Tryptophan is an essential amino acid important in human nutrition for the synthesis of melatonin and serotonin, hormones regulating mood and stress response.**

L-Tryptophan helps support relaxation, sleep, positive mood and immune function.** As an essential amino acid, it is not synthesized by the body and must be obtained from the diet. Piping Rock L-Tryptophan is pharmaceutically pure - every lot is tested to be free of Peak E and microbial contamination!

Quality Guarantee

Piping Rock products are designed to enhance your health and make a difference in your life! We guarantee purity, potency and safety in everything we do. We start with wholesome raw materials, sourced from reliable suppliers and then quality-tested in our lab. Since we make our supplements in-house, we control every step of manufacturing that follows- so we can promise top quality with confidence. We proudly uphold Good Manufacturing Practices (GMP) and meet standards set forth by the US Food and Drug Administration (FDA). We even verify Piping Rock products' purity with third-party, FDA-registered agencies. It is our privilege to go the extra mile to create products that provide only the best nutritional benefits for you, your friends and family.

Low Prices

After 40+ years in the natural products industry, we've found the secret to making quality nutrition more affordable than ever before. Our state-of-the-art supplement warehouse enables us to manage formulation, testing, manufacturing, quality control, packaging and shipping all under one roof. By eliminating expenses related to outsourcing, distribution and retail locations, we dramatically lower our operating costs without sacrificing quality. We are proud to pass the savings directly to you. By delivering the highest quality at low prices, Piping Rock makes nutritional well-being accessible and affordable for