MSM Capsules 850 mgProvides sulfur to support joint, immune and respiratory health* 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 that is crucial in maintaining healthy tissues. While sulfur supports many functions, it is well known for maintaining connective tissue health. Sulfur also supports