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In most skin-focused or cosmetic-focused research discussions, GHK-Cu vs BPC-157 usually favors GHK-Cu because of its stronger association with collagen, fibroblasts, and dermal remodeling

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This is one reason careful reading of the primary methods is required when reasoning about reported activity

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This is vastly more dilute than topical formulations, but isolated cells in culture have direct peptide access without any barrier to penetration