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R-Lipoic Acid: Nature's Form
R-Lipoic Acid is a form of Lipoic Acid that occurs naturally in plants, animals and the body. It is responsible for the beneficial effects of Alpha Lipoic Acid.
Alpha Lipoic Acid: 50% Unnatural Form
Alpha Lipoic Acid consists of a 50/50 mixture of the R-(natural) and S-(unnatural) enantiomers.
S-Lipoic Acid: Chemical By-Product of Alpha Lipoic Acid
S-Lipoic Acid is not found in natural and is a by-product from chemical synthesis of Alpha Lipoic Acid. it may also inhibit the most essential properties of the natural form.