Schiff Glucosamine Plus Vitamin D3 helps lubricate and protect joints by helping you maintain healthy structure and function of cartilage in your joints.* It contains Glucosamine Hydrochloride (HCl) which has a high potency of active Glucosamine. Glucosamine HCl is about 83% Glucosamine while some brands use Glucosamine Sulfate that is only about 65% Glucosamine. The recommended serving size is 2 softgels daily to get your daily dose of 2000mg of Glucosamine. Schiff guaranteed for purity, freshness and labeled potency. *These statements have not been evaluated by the food and drug administration. This product is not intended to diagnose, treat, cure or prevent any disease.