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The skin is designed to prevent penetration by chemicals and depending on the molecular size of those chemicals the skin will prevent much absorption by even beneficial skincare active ingredients
Proc Natl Acad Sci U S A 1996;93:7923-6
For laboratory and analytical applications, GHK-Cu is commonly supplied as a high-purity research peptide , produced under controlled conditions to ensure LPS-free and endotoxin-free standards
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