Creams and injections are different questions
Cream and shot notes · September 30, 2026
The first useful question is simple: are we talking about something put on the skin, or something injected? Keep that answer beside every claim.
| What to compare | On the skin | By injection |
|---|---|---|
| What it is | GHK-Cu is used in skin creams sold as cosmetics, for appearance. | A result from putting it on skin does not describe an injection. |
| What was studied | Human studies are few, small and mainly about skin creams. | A search of ClinicalTrials.gov, a public list of studies, on September 30, 2026 found no study testing GHK-Cu shots in people. |
| What that leaves open | These small studies do not answer every question about skin products. | A result from a skin product cannot establish what an injection does in a person. |
The search covers one study list on that date. It does not rule out research elsewhere.
The ingredient and the lab findings
GHK names a chain of three protein building blocks: glycine, histidine and lysine.
Cu means copper; GHK-Cu is that chain bound to copper.
The skin-care name copper tripeptide-1 refers to GHK-Cu.
There is no need to memorise the long names. Ask for the ingredient name and whether it goes on skin or is given as a shot, in writing.
A lab finding is a reason to ask more
In lab dishes, GHK-Cu prompted skin cells to make more collagen, the protein that helps give skin strength.
Those cell tests do not show how a cream or an injection works in a person.
The cell tests raise a question: could GHK-Cu help skin in people? They do not tell us how much a cream would help or what a shot would do.
When a skin product counts as a drug
The Food and Drug Administration oversees drugs in the US; its initials are FDA.
As of September 30, 2026, appearance-only cosmetics need no FDA approval, except for the ingredients that add colour.
Drug rules cover a product meant to change how the body works or treat disease, including a product put on skin.
As of September 30, 2026, the FDA says a claim to make skin produce more collagen brings a product under drug or medical-device rules.
These rules explain why the claims on a skin product matter. This page does not decide whether a particular cream meets them.