is ghk-cu naturally occurring in humans GHK-Cu: The Peptide That Transforms Skin and Tissue Health – Calibrate IV GHK-Cu Peptide for Body Composition

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With a half-life of 6 to 8 days, meaningful blood levels persist for approximately 3 to 4 weeks after the last injection

Injectable GHK-Cu was in Category 2 the more restrictive category for substances with "significant safety concerns." Its removal from Category 2 is the more positive development, as it signals the FDA no longer considers injectable GHK-Cu to carry the safety risk level that warranted Category 2 placement

However, allergic reactions are possible, although rare