What is it?Holland & Barrett MSM tablets contain Methylsulphonylmethane (MSM), a naturally occurring chemical found in plants, animals, and humans. MSM provides a source of sulphur.750mg of MSM A Naturally Occurring Source of Sulphur Suitable For Vegetarians and Vegans What Are the Benefits of This Supplement?Methylsulphonylmethane (MSM) is a naturally occurring source of sulphur, one of the major building blocks of glycosaminoglycans. Holland & Barrett International Limited, Barling Way, CV10 7RH, UKHolland & Barrett Limited, 45 Henry St, D01 E9X8, Ireland