Swanson R-Fraction Alpha Lipoic Acid 60 CapsSwanson R Fraction Alpha Lipoic Acid 60 Caps About Vitamins. co. nz Swanson R Fraction Alpha Lipoic Acid For a more effective alpha lipoic acid supplement, try Swanson R Fraction Alpha Lipoic Acid. Conventional alpha lipoic acid supplements feature a 50 50 racemic blend of R and S isomers, but the R isomer is the only form that occurs in the human body, and its the form responsible for most of alpha lipoic acids beneficial effects. However, efforts to