JointFlex® Vegetarian Glucosamine Daily 750mg is an everyday combination, with the flexibility to increase or decrease the dose. Glucosamine HCl 750mg with Manganese 2mg. No shellfish. Glucosamine is a natural component of glycosaminoglycans (GAGs), which form joint tissue (proteoglycans). Manganese is a vital mineral, required for normal formation of connective tissue, bone maintenance and cell protection. Recommended Daily Dose: 1 tablet daily (up to 2 if required). USP - Health Perception glucosamine conforms to United States Pharmacopeia purity standards so you can be sure it's top quality!