Health

Experts raise safety concerns over unproven copper peptide injections

NPR reports that anti-aging enthusiasts are injecting GHK-Cu despite a lack of human clinical evidence.

Updated Sep 7, 2026 · 09:47 UTC1 reports

The short version

Consumers are increasingly using subcutaneous injections of the copper peptide GHK-Cu for anti-aging and longevity purposes.[NPR]
While topical creams have years of research backing skin benefits, no published human clinical studies demonstrate that injecting GHK-Cu is safe or effective.[NPR]
Medical professionals caution that self-injecting unregulated products can lead to elevated copper levels, high liver enzymes, and uncertain product purity.[NPR]

GHK-Cu is not an approved drug, though topical formulas have been studied in human trials for decades.[NPR]
No published human trial data currently exists confirming the safety or efficacy of injecting GHK-Cu.[NPR]
Existing controlled human studies on GHK-Cu are generally small, cosmetic industry-backed trials focused on skin aesthetics, wound healing, and hair growth.[NPR]
Clinicians have reported adverse outcomes among patients self-injecting online products, including elevated copper and liver enzymes.[NPR]

The long-term physiological consequences and potential longevity benefits of human GHK-Cu injections remain unknown pending clinical trials.[NPR]
The exact identity, purity, and dosage of injectable peptide compounds sold through unregulated online suppliers are unverified.[NPR]

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.