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Someone who was using the peptide GHK-Cu (a copper-binding short protein fragment) reported skin reactions and lingering lumps. They had earlier noted that taking zinc seemed to stop new reactions, but three welts that formed before they used zinc never went away. After stopping GHK-Cu two months ago, those three hard lumps in the belly remain. The report is a single-person anecdote, not a formal study. GHK-Cu is a tiny peptide (short chain of amino acids) that naturally occurs in the body and can also be made synthetically. It’s often used in skin creams and sometimes injected by people because it’s thought to promote wound healing, collagen production, and skin repair. In plain terms: it’s a biochemical that can signal cells involved in healing and inflammation. People sometimes use it for cosmetic reasons, though it isn’t an approved or well-studied treatment for many uses. The snippet is not a scientific study. It’s a personal account describing persistent localized reactions after using GHK-Cu. Key facts here: the user saw welts (raised skin bumps), trying zinc seemed to stop new welts but did not resolve three existing ones, and those three lumps stayed hard and present two months after stopping GHK-Cu. We don’t know how large the lumps are, whether they’re painful, if imaging was done, or whether a healthcare provider examined them. There’s no control group, no lab tests, and no systematic follow-up, so the account can’t tell us how common this is or prove cause-and-effect. Why this matters: people using or considering GHK-Cu—especially by injection—should know that skin reactions and persistent lumps are possible, at least anecdotally. If true, this could mean some users end up with long-lasting subcutaneous nodules (hard lumps under the skin) that don’t resolve quickly on their own. Anyone self-administering peptides, or getting cosmetic injections, should pay attention to any persistent changes and seek medical advice rather than assuming they’ll clear up. Caveats and risks: this is one person’s story, not proof that GHK-Cu always causes such lumps. Other factors could be involved: injection technique, contamination, an allergic or immune reaction, infection, or interactions with supplements like zinc. Persistent lumps under the skin should be evaluated by a clinician; they may recommend imaging, test for infection, or consider excision if needed. Also, many peptide products are unregulated and variable in purity, increasing risk. If you’re pregnant, nursing, have immune conditions, or are considering injections, talk to a healthcare professional first. Bottom line: a single user reports long-lasting hard lumps after using GHK-Cu, which is a warning sign to be cautious and to get medical evaluation rather than assuming these reactions will self-resolve.
Source: r/Peptides