Are All Alpha-Lipoic Acid Dietary Supplements Equal in Quality and Performance?

Introduction.
Alpha-lipoic acid (ALA) is an antioxidant and mitochondrial enzyme cofactor that may selectively protect DNA and lipids from exercise-induced oxidative stress (1). In athletes, this has the potential to support muscle recovery and reduce cellular stress associated with intensive training. The concept of “mitochondrial nutrition” highlights nutrients such as ALA that can decrease mitochondrial damage and enhance antioxidant defense (2). Despite its popularity, an important question arises: do all commercial ALA dietary supplements (DS) deliver the same level of quality and performance?

Methods.
We evaluated nine commercial ALA DS available on the Serbian market using European Pharmacopoeia tests for solid dosage forms, including disintegration and dissolution testing. This independent assessment aimed to verify whether these products meet the pharmaceutical quality standards expected for reliable performance.

Results.
One formulation failed the disintegration test (Eur. Ph. 2.9.1.), as it did not disintegrate within 30 minutes. Three formulations failed the dissolution criteria (Eur. Ph. 2.9.3. and 5.17.1.), indicating that their release characteristics may compromise bioavailability and, consequently, their expected effects.

Conclusions.
Our results demonstrate that the quality of ALA DS is inconsistent, raising important concerns for athletes, coaches, and sports nutritionists. Athletes and their support teams should prioritize certified, independently tested products to ensure efficacy, safety, and optimal recovery.

1. Fogarty MC, Devito G, Hughes CM, Burke G, Brown JC, Mceneny J, et al. Effects of α-lipoic Acid on mtDNA Damage after Isolated Muscle Contractions. Med Sci Sports Exerc. 2013 Aug;45(8):1469–77.
2. Pagano G, Pallardó FV, Lyakhovich A, Tiano L, Fittipaldi MR, Toscanesi M, et al. Aging-Related Disorders and Mitochondrial Dysfunction: A Critical Review for Prospect Mitoprotective Strategies Based on Mitochondrial Nutrient Mixtures. Int J Mol Sci. 2020 Sept 25;21(19):7060.