Pure Encapsulations, MSM Capsules, 360 CapsulesPure Encapsulations MSM Capsules Description OptiMSM Supports joint, immune, and respiratory health Hypoallergenic Pure Encapsulations MSM (methylsulfonylmethane or dimethylsulfone) is a source of organic sulfur found naturally in the human body. MSM, the major metabolite of DMSO (dimethyl sulfoxide), is 34% elemental sulfur, a compound which is crucial in maintaining healthy tissues. While sulfur supports many functions, it is well known for