Thats where antioxidants in skincare come in
Astaxanthin is also found in several types of seafood, including: Salmon (higher in fresh salmon versus canned) Rainbow trout Shrimp Lobster You can also find the carotenoid in bright red or orange foods
Journal of Cosmetic Dermatology 14(2):83-90. [doi.org]
Additionally, magnesium deficiency and conditions like autoimmune diseases can also contribute to glutathione depletion
Effect of L-carnitine on the hepatic transcript profile in piglets as animal model [PMID: 22040461] Laboratory literature summary: Effect of L-carnitine on the hepatic transcript profile in piglets as animal model
Feces (50 mg) was incubated with 1 ml reaction solution containing 150 mM d 3 -l-carnitine, d 9 -l-carnitine, or d 9 -BB as indicated within 10 mM HEPES, pH 7.4, in a gas-tight reaction vial under anaerobic (Argon) conditions at 37C