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Someone on Reddit asked if people noticed any changes in their stretch marks after using GHK-Cu, and wanted details like how long it took, how they used it (cream vs injection), and what dose. There wasn’t a formal study presented — just a user asking for others’ personal experiences. That means the post is a crowdsourced question, not scientific proof. GHK-Cu is a small peptide (a tiny protein fragment) that naturally occurs in the body and binds copper, so people call it "copper peptide." In plain terms, it’s marketed in skin-care products because lab studies suggest it can help with healing, collagen production, and reducing inflammation. Some people apply it as a cream or serum, and a few use it in injectable form. The basic claim is that it may encourage skin repair processes, which is why folks wonder about stretch marks. Real research on GHK-Cu and stretch marks is limited. Most scientific work is in petri dishes, on skin cells, or in animals — and a few small human studies focus on wound healing or general skin appearance, not specifically stretch marks. Anecdotes on forums vary: some users report modest smoothing or lighter coloration over months, others see no change. There aren’t large, controlled human trials showing consistent, dramatic improvement of stretch marks with GHK-Cu. So any reported benefits from forum posts are provisional and could be due to other factors like moisturizing, time, or placebo effect. Why people care: stretch marks are common and can affect how people feel about their bodies. If a topical ingredient genuinely improves skin texture or boosts collagen, it could be a non-invasive option that’s cheaper and simpler than lasers or medical procedures. For someone looking for at-home skin improvements, trying a well-formulated product with GHK-Cu might be worth experimenting with, but expectations should be modest and it probably takes weeks to months to notice any change. Caveats are important. Topical copper peptides are generally considered safe for many people, but allergic reactions, irritation, or interaction with other active ingredients (like vitamin C or retinoids) can occur. The safety and effects of injecting GHK-Cu outside of medical settings are not well-studied and carry extra risks. Products vary in purity and concentration, and many claims are unregulated. If you have sensitive skin, are pregnant, breastfeeding, or have a skin condition, check with a healthcare provider before trying it. Also, because the evidence for stretch-mark reduction is weak, don’t expect guaranteed results. Bottom line: GHK-Cu is a promising skin-repair peptide with some lab and small-scale human support, but solid proof it reliably improves stretch marks in people is lacking; if you try it, do so cautiously and be prepared for mixed outcomes.
Source: r/Peptides