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When GHK-Cu combines with hyaluronic acid, collagen IV shows a remarkable 25.4-fold increase, demonstrating synergistic effects with other skin-supporting compounds
Cys is the key metabolite in the synthesis of sulfur-containing compounds in plants, while the major pool of sulfur, which is not stored in proteins is the Cys-containing peptide GSH (Hell and Wirtz, 2011)
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