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Allergic reactions to GHK-Cu are uncommon but can occur, particularly in individuals with sensitivities to copper or related compounds

But quality head-to-head studies do not show that they are better than capsules with the same ingredient and dose

Independent Product Review Independent review of GHK-Cu - Recovery and Repair Peptide Review from Empower Peptides - covering pricing, purity testing, packaging quality, shipping, and real buyer feedback

10.1101/gad.343129.120 7 BourgeoisB.SpreitzerE.Platero-RochartD.PaarM.ZhouQ.UsluerS.et al (2025)

Though considered safe when administered correctly, glutathione injections may cause mild symptoms such as discomfort at the injection site or occasional dizziness