What does alpha-lipoic acid do for cartilage glutathione?
Alpha-lipoic acid, once reduced inside cells to dihydrolipoic acid, raises cellular glutathione by helping cells take up cysteine, mainly in cells that are short of it (Han 1997). In rats it lessened cartilage damage and oxidative markers (Wang 2016), and in mouse cartilage cells it protected glutathione and GPX4 and suppressed ferroptosis (Chen 2026).
The cysteine helper
In a 1997 lab study, lipoic acid substantially increased reduced glutathione in several kinds of cells, including human red cells and lymphocytes. Reduced to dihydrolipoic acid and released by the cell, it converted cystine into cysteine, which the cell could take up easily and use to make glutathione. It mainly normalised cells that were badly short of glutathione rather than pushing healthy cells higher (Han 1997).
In cartilage
In rats with chemically induced osteoarthritis, alpha-lipoic acid at 50 to 200 mg/kg for 14 days lessened cartilage degeneration, raised collagen type II and aggrecan gene activity and reduced oxidative damage markers and NF-κB activation (Wang 2016).
In mouse cartilage cells exposed to an inflammatory signal, dihydrolipoic acid reduced iron and lipid peroxidation, limited the loss of glutathione and GPX4, and held back MMP13. In mice it slowed cartilage degeneration after joint surgery (Chen 2026).
Where it fits
Alpha-lipoic acid is the fourth part of Gluthanol™: not a building block of glutathione itself, but a helper for the cysteine supply.
Other questions people ask
Is alpha-lipoic acid an antioxidant on its own?
Its reduced form, dihydrolipoic acid, is. Much of its effect on glutathione comes through improving cysteine uptake (Han 1997).
Sources
- Han D, Handelman G, Marcocci L et al. Lipoic acid increases de novo synthesis of cellular glutathione by improving cystine utilization. Biofactors 1997.
- Wang J, Sun H, Fu Z et al. Chondroprotective effects of alpha-lipoic acid in a rat model of osteoarthritis. Free Radic Res 2016.
- Chen Y, Fang J, Zhou Z et al. Dihydrolipoic acid suppresses ferroptosis in chondrocytes to ameliorate the progression of osteoarthritis by modulating the FOXO1/TXNIP signaling pathway. Free Radic Biol Med 2026.
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