PhytoTreat Glucosamine-Extra is a supplementary pet food for dogs' supple joints, containing a high dose of glucosamine and MSM. Its unique properties include hydrolyzed collagen and supportive plant extracts. Glucosamine is an essential building block for the development and maintenance of articular cartilage. MSM (methylsulfonylmethane) is a natural source of organic sulfur. Sulfur helps produce collagen, a key component of cartilage and connective tissue. Only in high doses has it been shown that these substances help maintain joint function. PhytoTreat Glucosamine-Extra also contains naturally hydrolyzed collagen and extracts of devil's claw, blackcurrant, horsetail, boswellia, and nettle for additional maintenance and care of muscles and supple joints.