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In page Lipoic acid:

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Baseline levels (prior to supplementation) of RLA and R-DHLA have not been detected in human plasma.[4] RLA has been detected at 12.3−43.1 ng/mL following acid hydrolysis, which releases protein-bound lipoic acid. Enzymatic hydrolysis of protein bound lipoic acid released 1.4−11.6 ng/mL and <1-38.2 ng/mL using subtilisin and alcalase, respectively.[5][6][7]