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GHK-Cu has a broader research history involving collagen, tissue repair, extracellular matrix remodeling, inflammation, antioxidant activity, and skin health

N., Kaminsky, A

"Structure of Trypanosoma brucei glutathione synthetase: domain and loop alterations in the catalytic cycle of a highly conserved enzyme"

Researchers became interested in the combination after observing that glutathione levels tend to decline with age while oxidative stress, inflammation, and mitochondrial dysfunction increase.59 The idea is that providing both cysteine and glycine may help the body rebuild glutathione more efficiently than either nutrient alone