Reference entry

Copper tripeptide-1

Also listed as GHK-Cu

Read the scope, examine the source, and keep your own question alongside the evidence.

Status labels apply within the product, route, and use described below. Read the limitations alongside that scope.

Scoped product status: Topical cosmetic
Evidence label: Cosmetic-use evidence

Status as of 2026-10-27

Reference fields

Sources for these fields

Product and use: A skin-care ingredient; this entry is limited to topical cosmetics.
Route context: Topical context only; not injection.
Mechanism: A complex formed by copper and a tripeptide.
Evidence: One post-laser study found no objective between-group skin advantage.
Limitations: A topical study cannot establish the effects of an injection.
Safety: FDA identifies limited human safety data for injectable GHK-Cu.

From a report to your question

Give the comparator a full description, rather than leaving it as the unnamed other group. Read what each group received or experienced, how their starting points were defined, and which outcome was compared. If several features differ between the groups, ask which difference the conclusion attributes the result to and how that attribution is supported. A comparison answers a question about specified alternatives. Describing those alternatives in ordinary language can reveal whether the report addresses the choice you have in mind or a different contrast.

Questions to consider

What does each side of the comparison represent in practical terms?
Which differences between the groups are relevant to the conclusion being drawn?
Are these the alternatives in my question, or does the comparison concern something else?

Sources

These references support the fields as a group. Follow a source to check the original wording and its scope.

CIRCIR · Checked 2026-10-27
MillerPubMed · Checked 2026-10-27
FDA safetyFDA · Checked 2026-10-27
FDA cosmeticsFDA · Checked 2026-10-27

Continue reading

Reading topics: Skin. These organize the library and do not describe recommended uses.

Educational reference information. No clinician review is claimed. This entry does not provide personal medical advice.