GaiaThera Opti-MSM is an Excellent Source of Organic Sulfur The primary function of Sulfur from MSM (methylsulfonylmethane) is transporting oxygen across your cell membranes. Without intracellular oxygen, your health declines and you age sooner, rather than later. Oxygen Transportation Across Cell Membranes Improves... Cellular respiration (conversion of nutrients into energy, then waste elimination) Healthy cell regeneration Recovery from fatigue Athletic performance Tissue rebuilding - this is the short list. Cellular oxygen transport enables healthy cellular regeneration. It's essential to joint and soft-tissue repair, and maintenance. It may speed up muscle recovery by assisting in...