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doi: 10.1097/HJH.0000000000001767 114
Coordination state and stoichiometry matter for reproducibility, which is why generic GHK-Cu labeling without lot-matched characterization is a weak signal
This stage is usually when people start looking for skin glow supplements or internal support options
GHK-Cu vs Adjacent Categories Format Topical GHK-Cu (cosmetic) What it is Copper Tripeptide-1 in serums and creams Evidence base Strongest human evidence (Leyden 2002, NEEL 2023) Typical use Daily anti-aging skincare Format Injectable GHK-Cu (research-use) What it is Reconstituted vial, SubQ injection Evidence base Mostly preclinical
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