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How GHK-Cu Compares to Retinoids, Vitamin C, and Other Anti-Aging Ingredients The 1998 head-to-head trial by Abdulghani measured procollagen synthesis side by side, and the copper-binding peptide outperformed both vitamin C and tretinoin

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In some people, particularly older adults or those with limited protein intake, both glycine and cysteine availability may constrain glutathione synthesis

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