Methylsulfonylmethane (MSM) is a natural, sulphur-based substance found in cell walls that makes them permeable for oxygenation and removal of waste products. MSM boosts lactic acid secretion, helping muscles to quickly regain suppleness. Ideal for stiff, older dogs, or hard-working dogs exposed to a lot of stress for rapid recovery and to build up cartilage, ligaments, sinews, connective tissue, bones and muscles. Made in Sweden. 450ml/bottle.