Some mild side effects may include bruising or discomfort at the injection site
Most people see noticeable skin brightening and clarity within 46 sessions, depending on dosage, skin type, and lifestyle
This leaves open the question that there may be some other primary effect that is yet to be determined, says Ard
Biomaterials 204:3645 Li Y, Guo Y, Cheng Y, Liu X, Li H, Liu C et al (2025) Dual-metal-organic framework and gallic acid incorporated 3D-printed scaffolds: revolutionizing refractory bone defect repair through immune-angiogenic-neurogenic synergy
ACS Biomater Sci Eng
The amount of copper in most copper peptide serums is low enough that it shouldnt pose a major risk to most healthy people, but its still something to be mindful of.15 However, those with Wilsons disease a rare genetic condition may be best off avoiding copper peptide serums (or any skin care product containing copper), as the condition causes the element to build up in the body.16 Cancer risks GHK-Cu seemingly promotes angiogenesis, or the formation of new blood vessels.14 Though this can lead to beneficial outcomes like better wound healing, it may also lead to the growth or spread of cancer by giving solid tumors a blood supply.17 This means that if you have active or suspected cancer, it may be wise to avoid copper peptides