GHK-Cu explained: the copper peptide your body makes less of with age

• What it is: GHK is just three amino acids — glycine, histidine and lysine — that grab onto copper to form GHK-Cu [2].
• Your body makes it: it's in blood, saliva and urine. Levels drop from about 200 ng/mL at age 20 to about 80 ng/mL by age 60 [2].
• The headline results: skin cells made more collagen at picomolar amounts [4], and gene data show it shifting over 4,000 human genes [2][3].
• The catch: much of the research comes from the scientist who discovered it, and the gene findings come from cell data, not people [3].

The story starts in 1973, when a researcher named Loren Pickart noticed something odd: when liver tissue from older people (aged 50 to 70) was bathed in blood plasma from young people (aged 20 to 25), the old tissue started making proteins like young tissue. Pickart tracked the effect to a tiny molecule — GHK [1][5].

GHK is named for its three amino acids: glycine, histidine and lysine. It has a strong pull for copper, and the pair forms GHK-Cu. The copper is why the powder is blue — our certificates list it as “blue lyophilized powder.”

At a molecular weight of around 400, it's tiny — less than a third the size of BPC-157. And here's a neat detail: the GHK sequence is built into collagen itself. Researchers think it gets released when collagen breaks down at a wound, like a built-in “repair here” signal [4].

Think of GHK-Cu as a site foreman for tissue repair. The research describes it doing several jobs at once:

• Calling in the crew. It attracts immune cells and blood-vessel cells to an injury [2].
• Building and clearing. It boosts both the making and the breakdown of collagen, and tunes the enzymes that remodel tissue [2].
• Calming things down. Reviews describe anti-inflammatory and antioxidant effects [6].
• Carrying copper. Its grip on copper is similar to the copper-carrying site on albumin, the main protein in blood [6].

• Collagen at tiny amounts. Skin cells called fibroblasts made more collagen starting at around one trillionth of a mole per liter, with the peak effect at one nanomolar — and not just because there were more cells [4].
• Wound healing across species. Reviews report faster healing of skin, hair follicles, the gut lining, bone and dogs' foot pads, plus whole-body wound healing in rats, mice and pigs [2].
• Skin. In cosmetic studies on aging skin, GHK-Cu products were reported to tighten skin, improve elasticity and firmness, and reduce fine lines, wrinkles and sun damage [2][6].
• Hair. It increased hair-follicle size and improved hair-transplant success [6].
• Genes. Using the Broad Institute's Connectivity Map, a large database of gene responses, researchers found GHK shifted about 31% of human genes by 50% or more, turning 59% of those up and 41% down [3]. That's over 4,000 genes [2].

• Much of the literature comes from one source. Many of the key papers and reviews come from Pickart, who discovered GHK, and collaborators — which doesn't make them wrong, but does mean more independent work would help.
• The gene data aren't people. They come from how cells in a database respond, not from measuring genes in anyone [3].
• The skin studies were cosmetic. They tested products applied to skin, so they aren't evidence for any other kind of use.
• It isn't an approved medicine. A 2026 sports-medicine review notes that rigorous human safety data are scarce for peptides sold this way [7]. We supply GHK-Cu for laboratory research only.

GHK-Cu is two things in one: a peptide and a metal. So before any batch goes on sale, an outside lab checks:

• Identity by mass spectrometry, confirming the molecule is GHK-Cu.
• Purity by HPLC, the exact figure for that lot, to two decimals. Never “99%+.”
• Appearance, which should be blue — the color of the copper. GHK without its copper is white, so a white “GHK-Cu” powder is a red flag.

Every GHK-Cu batch we've released is on the GHK-Cu lab-reports page, with its signed certificate. If a vial doesn't match its report, test it at any lab you like and we'll refund it in full.

GHK-Cu is the rare research peptide your body already makes — and makes less of with age. The lab work on collagen, wound healing and gene activity is fascinating, and it's already widely used in skin and hair products [3]. What it isn't, yet, is a proven medicine. If you're studying it, start with a vial you can verify.