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A Reddit user says they’ve been applying a peptide called GHK-Cu (a copper-containing peptide) to their face for about three weeks and started getting bad acne. They tried taking zinc supplements and cutting the topical dose in half, but the breakouts moved from one cheek to the forehead. They’re asking whether these “copper uglies” (a slang used online for skin flares thought to come from copper peptides) will go away and whether they should stop. GHK-Cu is a short peptide (a tiny protein fragment) that naturally occurs in the body and is also made into creams and serums. It’s often advertised to help with skin healing, collagen production, and anti-aging. The “Cu” means it’s attached to a copper ion; copper changes how the peptide behaves and is part of the reason people use it for skin repair. It’s not the same thing as prescription drugs like retinoids; it’s an ingredient in cosmetics and over‑the‑counter serums. What this Reddit post shows is an anecdote — one person’s experience — not a controlled study. There are some reports online that topical copper peptides can trigger breakouts or skin purging for some people, and zinc can sometimes affect copper levels in the body, but there isn’t strong clinical evidence proving a consistent “copper uglies” reaction. The user tried modifying dose and added zinc, but there’s no way from this alone to know whether the peptide caused the acne, whether it’s a temporary reaction, or whether another product or hormonal factors are to blame. In research terms, anecdotes are useful for flagging possible issues, but they don’t tell you how often or why it happens. Why this matters: lots of people use cosmetic peptides hoping for smoother, younger-looking skin. If a product provokes breakouts, that can be very distressing and counterproductive. For someone trying a new active ingredient, knowing that others report similar problems can justify pausing the product, patch-testing first, or consulting a dermatologist before continuing. It also matters because taking zinc supplements to counteract copper exposure is something people do, but supplements can have their own effects and interactions. Caveats and risks: GHK-Cu in over‑the‑counter skin products isn’t regulated like medicines, so formulations and concentrations can vary. Skin reactions can come from the peptide, the copper, other ingredients in the serum (fragrances, preservatives), or from applying too much. Oral zinc can interfere with copper absorption and should not be taken long-term without medical advice. If a breakout is severe, widespread, or accompanied by pain or infection, stop the product and see a healthcare professional. Patch testing (try a small area for a week) and checking with a dermatologist are safer than experimenting broadly. Bottom line: This is one person’s story that suggests GHK-Cu might trigger acne for some users, but it’s not proof; if you get a bad reaction, stop using it and talk to a dermatologist before trying supplements or continuing.
Source: r/Peptides