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. 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. Promotes Bone Health - Lysine helps the body absorb and conserve calcium, a vital mineral for supporting bone health.*. Collagen Support - L-Lysine plays an important role in the formation of collagen, a substance important for bones and connective tissues including skin, tendons and cartilage.*. Essential Amino Acid - L-Lysine is an essential amino acid, which means it cannot be produced in the body and must be obtained from food or by supplementation. May support vegetarians and athletes who participate in frequent vigorous exercise.*.