NOW&ampreg; AlphaSorb-C&amptrade; includes Transport C-PLUS&ampreg;, the trademarked blend of Threonic Acid Enhanced Buffered (non-acidic) Calcium Ascorbate and Alpha Lipoic Acid. &ampnbsp;Threonic Acid (a Vitamin C metabolite) has been shown to enhance cellular uptake of Vitamin C. &ampnbsp;Alpha Lipoic Acid is an antioxidant known to help regenerate Vitamin C in the body. &ampnbsp;Furthermore, studies suggest that Alpha Lipoic Acid may enhance the body's utilization of Vitamin C.&ampnbsp; The addition of Bioflavonoids as synergists helps to create a well-absorbed, highly effective Vitamin C supplement.&ampnbsp; Vitamin C is best known as a highly effective antioxidant that can protect the body's cells and molecules from damage by free radicals.*