GHK-Cu references: every specimen in this herbarium, pinned to its source.

How to read this index

Every quantitative claim across this GHK-Cu herbarium carries an inline marker that maps to the numbered entries below. The list spans the foundational fibroblast and tissue-remodeling work, the skin and hair trials, the human skin-penetration and rat pharmacokinetic studies, the Connectivity-Map gene-expression analyses, and the recent intranasal neuroprotection preprints.

Two entries are preprints (bioRxiv) rather than peer-reviewed journal articles — the two Tucker 2023 intranasal-GHK cognition studies ^[8][9] — and are labeled as such throughout. The remainder are peer-reviewed. Where a study used the free peptide GHK instead of the copper chelate GHK-Cu, that distinction is noted in the relevant specimen plate, because copper coordination governs which findings transfer between the two forms ^[6]. The full numbered list is rendered in the references plate.