GHK-Cu
Human data is on skin creams only.
Grade C: Animals and lab only
Looks good in rats or in a dish. Not proven in people.
The grade is for the use people talk about, not for every use. Filed under: Repair.
How it works
Carries copper and signals cells to make collagen.
How it was given in studies
On the skin. The human trials are small and used face creams.
This is what the studies did. It is not a how-to. Source: 2026 review of GHK-Cu studies. Archives of Internal Medicine Research.
What studies saw
Small skin-cream studies reported better skin over weeks, but they were poorly described, and a 13-person trial found no measurable gain. In a rat ACL study the gain faded once treatment stopped.
The trade-off
Injected use has no human trials.
When it showed up, in studies
No human timeline for injuries. Skin creams showed changes over weeks.
Sources
Put this grade on your site
Copy the line below. The badge links back to this page, so readers can check the sources. It grades the compound in studies. It does not rate any product or seller.
<a href="https://www.workedinrats.com/compounds/ghk-cu"><img src="https://www.workedinrats.com/badge/ghk-cu.svg" alt="GHK-Cu: grade C, animals and lab only. Worked in Rats" width="300" height="72"></a>
Keep going
We show what studies found. We never tell you what to take. Doses vary by study. Check the sources and talk to a doctor.