does glutathione regenerate vitamin c and C: Do They Work Together? Is Glutathione the Master Antioxidant?

GHK-Cu delivers and modulates copper and stimulates dermal fibroblasts to synthesize collagen, elastin, glycosaminoglycans, and proteoglycans, while modulating matrix metalloproteinases and antioxidant and anti-inflammatory pathways

Lancet Psychiatry 9 (11), 907921

This can directly verify the central retinal artery affected by L-NAME (i.e., vasoconstriction), with adequate time to produce/initiate the chain of damaging events, further lesion progress, and progressive NO-system failure from week 1 to week 2 to week 4 in L-NAME-treated rats [13]

Unlike other antioxidants you consume (vitamin C, E), glutathione must be produced inside your cells from three amino acids: cysteine, glycine, and glutamate

But again, the big problem is a lack of evidence that these peptides work on humans