STUDIES · 1973 — 2024 · REV. 2026.05
GHK-Cu: what human and lab studies found from 1973 through 2024
GHK-Cu is a small group of protein building blocks joined to copper. This page covers eleven studies and marks which findings came from people.
1973: what GHK-Cu changed in older liver tissue
GHK-Cu is made from three tiny parts used to build protein, joined to copper. Loren Pickart found it in the clear part of human blood in 1973 [1]. Material from young donors helped older liver tissue make protein at a younger rate [1]. The test used tissue outside the body, not living people like you.
At age 20, each milliliter of blood held about 200 nanograms of GHK; a nanogram is one billionth of a gram. By age 60, the amount was about 80 nanograms per milliliter [2]. That age gap led researchers to ask whether GHK-Cu might aid repair as your body ages. Later tests used people, mice, body tissue, or dish-grown cells.
What makes GHK-Cu different
GHK is a tiny group of protein building blocks that can hold copper [3]. Your body has GHK in blood, saliva, and urine. Once copper joins it, the name becomes GHK-Cu. On a skin-care bottle, you may see Copper Tripeptide-1 instead.
What GHK-Cu has changed, and what it hasn't proved
Studies have checked GHK-Cu for collagen, wound repair, hair roots, and cell damage [3][4]. Most work in people used creams or gels on the skin. It included face cream, laser aftercare, and gel for diabetic foot sores [5][6][7]. Longer life and organ repair haven't been shown in human trials, so those claims can't guide your care.
What sets GHK-Cu apart from other copper peptides
GHK-Cu is one copper peptide, and researchers have studied it more than the related kinds. Researchers compared it with another copper peptide in hair-root cells [8]. Both changed some of the same proteins that help cells grow. On many skin-care labels, “copper peptides” means GHK-Cu, though you may find other kinds on your bottle.
What the GHK copper peptide changed in cells
The GHK copper peptide can carry copper into cells, where copper helps with their normal work [3]. One dish test checked 13,424 sets of cell instructions. GHK changed 4,192 of them [4]. Researchers don't yet know whether those changes would help your body, harm it, or make no clear difference.
What Copper Tripeptide-1 tells you on a label
Copper Tripeptide-1 is the skin-care label name for GHK-Cu [3]. The two names mean the same ingredient in your skin product. Research papers may use other names for it. You don't need to learn those names to spot GHK-Cu on your own bottle.
What copper changes in GHK-Cu
Without copper, the small protein part is called GHK. The name changes to GHK-Cu when copper attaches. In dish tests, removing copper stopped the changes in collagen, wound repair, and cell activity [3]. That suggests copper causes most lab effects, but it can't predict a change in your skin.
What GHK-Cu serum changed in skin studies
GHK-Cu serum is a liquid or cream spread on your skin. Human studies used strengths from 0.05–5%, from the weakest mix to the strongest [5][6]. The best-known 2002 work was a 12-week, 71-woman face-cream study [5]. The women had some gains, but one study can't predict what you would see.
Where you can check each GHK-Cu claim
The paper list gives the source for each claim. How GHK-Cu may work explains the changes seen in cells. GHK-Cu dosage lists the amounts used in studies, not a personal dose. Copper peptides hair covers hair roots, while common questions covers skin trouble and shots.