ProtoSorb™ C is a unique formulation featuring Transport C-PLUS® threonic Acid, which has been shown to enhance uptake of vitamin C.* This buffered, non-acidic vitamin C supplement also contributes alpha-lipoic acid, a free radical scavenger known to help regenerate both vitamin C and glutathione in the body.* Studies suggest that alpha-lipoic acid may further promote the body’s utilization of vitamin C, by activating uptake into cells via the glucose transport pathways.* Bioflavonoids also synergistically participate at the cellular level to create a well-absorbed, highly biologically available vitamin C supplement.* Vitamin C is required for the synthesis of collagen, a structural component of blood vessels, tendons, ligaments and bone.*