Dietary Supplement Supports Joint and Skin Health Gluten-Free Sugar-Free Preservative-Free Potency & Quality Guaranteed An FDA Regulated FacilityMineral depletion in the soil and mineral loss through food preparation make it difficult for us to get an adequate amount of Sulfur. Carlson MSM Sulfur from OptiMSM is a highly bioavailable form of sulfur that's found in many of our body's tissues. It supports joint health by helping to maintain healthy connective tissue and is an important component of skin, hair, and nail proteins.