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New England Journal of Medicine, 370(22), 20632066

Mitochondrial ROS in cancer: initiators, amplifiers or an Achilles heel

Foods high in sulphur-containing amino acids (like cysteine) are key: Eggs Lean meats and fish Whey protein Allium vegetables (garlic, onions) Cruciferous veg (broccoli, Brussels sprouts) Some foods contain glutathione itself - particularly avocado, spinach, asparagus, and okra - but cooking and storage rapidly degrade it

Chemical penetration enhancers including propylene glycol, dimethyl sulfoxide (DMSO), and various terpenes increase GHK-Cu skin penetration by 2-4 fold, though potential irritation risks require careful optimization