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@ronlud

Also, reading the one report it states : It has been suggested that the presence of S-lipoic acid in the racemic mixture may limit the polymerization of R-lipoic acid and enhance its bioavailability. At present, it remains unclear which supplemental form is best to use in clinical trials.
So it may be better to use the mix ?

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Replies to "Also, reading the one report it states : It has been suggested that the presence of..."

I really have no expertise but everything I've read says the S-ALA which is a byproduct in making the R-ALA supplement is inactive and really doesn't do anything to help. I think it's just cheaper to leave it in instead of refine the product more to take out the S-ALA for a 100% R-ALA product. This article has an easier to read and understand explanation...

(R)-Lipoic Acid: Unique ‘Mitochondrial Antioxidant’ Fights Premature Aging: https://nutritionreview.org/2019/07/r-lipoic-acid-unique-mitochondrial-antioxidant-fights-premature-aging/

I wouldn't purchase the version with S-ALA even if it's cheaper, but that's just my opinion.