Methylsulphonylmethane (MSM) is a naturally occurring, organic, sulphur-containing compound related to another sulphur-containing substance, dimethyl sulphoxide (DMSO). MSM is found in small amounts throughout nature and has been detected in small amounts in the blood and urine of humans.High-strength product at a new reduced price. M.S.M. (Methylsulfonylmethane). A recommended dosage of 1 per day is required - benefits are usually felt within 2-3 weeks. 1000mg. (size R)