GHK-Cu
GHK-Cu is a naturally occurring copper peptide widely used in skincare and scalp products. Topical use is legal as a cosmetic. Injectable GHK-Cu is not approved.
What it is
A three-amino-acid peptide bound to copper that is found naturally in blood plasma.
What the evidence shows
In people
Small cosmetic studies report improvements in the look of fine lines and skin firmness. Many studies are small or industry-funded.
In animals and labs
Lab and animal studies suggest roles in wound healing and collagen production.
Legal status
Legal as a cosmetic ingredient in topical products. Not approved as an injectable drug.
Dosing
Follow the product label
Supplements and skincare products are used as directed on their label. Choose products with third-party testing, and check with a clinician if you are pregnant, nursing, or take medication.
Known risks
- Skin irritation in some people
- Injectable products carry contamination risk and are unapproved