Joint Factors by TwinLabs - Helps promote cartilage regeneration and health joints. Contains Glucosamine Sulfate - 1500 mg, Vitamin C - 1000 mg, Manganese - 5 mg, Zinc - 15 mg, Copper- 1.5 mg, and Vitamin A 5000 IU. Copper is coated to prevent interaction with imcompatible nutrients. Suggested dosage is 4 capsules daily or as directed by a physician. For best results take two capsules with morning and evening meals.