Since 1936 Glucosamine 2000 mg Plus Vitamin D3 Per 2 Tablets Helps Lubricate & Protect Joints High Potency† Glucosamine With Hyaluronic Acid & Vitamin D3 Joint Care SupplementSchiff Glucosamine Plus Vitamin D helps you maintain healthy structure and function of cartilage in your joints.† High Potency - Glucosamine Hydrochloride (HCl) 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.