This is my favorite ALA product!
R-alpha lipoic acid is the natural enantiomer (version), while S-alpha lipoic acid is the synthetic enantiomer (version). The R enantiomer of ALA shows better pharmacokinetic parameters, including absorption and increased bioavailability as compared to its S enantiomer.
Best quality and at the best price from a top notch distributor, iHerb. For deep immune support. It enhances both the adaptive and the innate immune systems. Protects you from infections. Shields your body from cell degeneration & oxidative damage. As a result it is anti-aging.