Natural Balance MSM Unflavored -- 320 g

What the brand says

Research has shown that MSM (methylsulfonylmethane), a bioavailable form of dietary sulfur, plays a crucial role in the formation of many tissues in the body, including collagen, a key component of cartilage and bone. MSM has also been shown to be beneficial in aiding the healing of sports injuries and muscle soreness. Regular use of MSM may improve flexibility and ease of movement helping you maintain healthy joints and strong connective tissue.