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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

74 However, because these results were never formally published in peer-reviewed journals, they have to be taken with caution

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Individual Variation: Effects varied among participants within trials

Each batch is independently tested and supported by a Certificate of Analysis confirming purity and identity