Swanson R-Fraction Alpha Lipoic Acid is a supplement built on the R isomer of alpha lipoic acid, the form the body naturally produces. Standard alpha lipoic acid supplements use a 50-50 mix of R and S isomers, while this one is made to deliver mostly the R form. The maker claims plasma levels of R-alpha lipoic acid peak within 30 minutes at up to 8-10 times those of regular racemic products. It suits people who already take alpha lipoic acid and want the more bioavailable isomer, though the R form is less stable and harder to formulate, which is why few brands offer it.
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Lowest price we've seen: $16.79 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Buyers rate it highly, with 4.6 out of 5 across 40 ratings. Most feedback centers on the R-only formula and how it compares with ordinary alpha lipoic acid.
Swanson R-Fraction Alpha Lipoic Acid is an alpha lipoic acid supplement made with the R isomer. Conventional alpha lipoic acid supplements use a 50-50 racemic blend of R and S isomers. The R isomer is the only form that occurs in the human body, and it is the form responsible for most of alpha lipoic acid's beneficial effects.
Supplements containing only the R form have long had stability problems. This form addresses that issue. Plasma concentrations of R-alpha lipoic acid reach their maximum after 30 minutes, at levels up to 8 to 10 times greater than those reached by regular (racemic) alpha lipoic acid supplements.
