(Methylsulfonylmethane) Dietary Sulfur Supplement OptiMSM MSM serves as an important source of bioavailable dietary sulfur, an element that plays a critical role in maintaining the integrity and elasticity of connective and other tissues. It is an important component of proteins found throughout the body, such as in hair, nails, skin and tendons. Vitamin C is necessary for the formation of connective tissue, amino acid metabolism, and hormone synthesis and serves as a key factor in the body’s immune system. Molybdenum is a trace element that is needed by the body for sulfur metabolism, oxygen transport, and detoxification.