Methylsulfonyl methane more commonly known as MSM is a popular dietary supplement. It’s a sulfur containing compound found naturally in plants animals and humans. Disclaimer Please consult your health care practitioner. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose treat cure or prevent any disease. Therapeutic is defined by the Australian Therapeutic Goods Administration TGA as: preventing diagnosing curing or alleviating a disease ailment defect or injury in persons or animals or influencing inhibiting or modifying a physiological process in persons or animals or testing the susceptibility of persons or animals to a disease or ailment or influencing controlling or preventing conception in persons or testing for pregnancy in persons or the replacement or modification of parts of the anatomy in persons or animals.