Methylsulfonylmethane (MSM) is the oxidized form of dimethyl sulfoxide (DMSO)
Also known as: Methylsulfonylmethane, dimethyl sulfone, dimethylsulfone
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https://www.lifeextension.com/Magazine/1999/9/products/Page-01
https://www.lifeextension.com/Protocols/Immune-Connective-Joint/Osteoarthritis/Page-01