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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
this is often cited as 80-95% or near-complete systemic delivery, because it bypasses degradation and enters the bloodstream directly
Dermatologists now prescribe it at far lower doses for hair regrowth
It does, but not just any old amino acids
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