Redox BioScience strives to make the purest dietary supplements possible. We verify the purity of our products with stringent analysis, which is conducted by our in-house laboratory services. Our R-Dihydrolipoic acid is 99.89% pure. Results are always verified with a 3rd party laboratory, deeming this evaluation as truly independent. The slight difference in results in the above CoA’s reflects the difference in methodology used. Thus, by continuously verifying the purity and quality of our products we are able to produce a product of the highest purity.