R-Alpha-Lipoic Acid. R (+) Lipoic Acid Ubiquitous Antioxidant. Each capsule contains 50 mg of R-alpha-Lipoic Acid the only 100% biologically active natural form of alpha lipoic acid. . R (+) Lipoic Acid is an antioxidant that contains the "R" form of Alpha Lipoic Acid. Alpha Lipoic Acid is a well known antioxidant formula that is believed to help delay the onset of aging act as a potent antioxidant in the brain and has applications for blood sugar regulation. Commercially available Alpha Lipoic Acid is a racemic mixture of both "S" and "R" forms of Alpha Lipoic Acid.