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Someone asked whether a peptide protocol called GLOW (or KLOW) could tighten up loose skin after big weight loss, and mentioned they’d tried GHK-Cu (a copper peptide) before. They figure surgery is the reliable fix but expensive and risky, so they wonder if these treatments might give even a modest improvement like 15–20%. GHK-Cu is a small molecule that’s often called a peptide, though technically it’s a short protein fragment bound to copper. It shows up in skincare because lab studies suggest it can signal skin cells to make more collagen and other support proteins. In plain terms: it’s a topical (applied to the skin) ingredient that can sometimes help skin look firmer and heal better. “GLOW” or “KLOW” sound like specific protocols or product stacks built around GHK-Cu and related things, not a single, universally defined medical treatment. What the evidence actually shows is limited. Most supportive data for GHK-Cu come from lab dishes and animal studies, or small cosmetic trials looking at fine lines, skin texture, and wound healing. There’s some proof it nudges collagen production and reduces inflammation in controlled settings, and a few small human trials report modest improvements in skin appearance. But there’s little to no high-quality research directly showing it tightens large areas of loose skin after major weight loss. Those cases involve excess tissue and stretched connective structures; that’s a different, tougher problem than smoothing wrinkles. So if improvement happens, expect it to be small and gradual, not a replacement for surgical removal. Why this matters is simple: people who’ve lost lots of weight often want a less risky, less expensive way to improve their body without surgery. Topical peptides or noninvasive protocols are appealing because they’re low‑commitment and generally accessible. If a peptide protocol gives a noticeable 10–20% improvement in texture or firmness, some people might find that tradeoff worthwhile compared with the cost and recovery of surgery. But manage expectations: these treatments are more likely to improve skin quality than to eliminate excess hanging tissue. Caveats are important. Topical GHK-Cu is generally well tolerated, but allergic reactions, irritation, or unexpected interactions with other skincare products can occur. Dosage, formulation, and application method matter a lot; over-the-counter products vary widely in purity and concentration. The biggest unknown is effectiveness for large-scale laxity after major weight loss — the science simply isn’t there yet. If someone is considering injections, off-label mixes, or combining unproven protocols, that raises additional safety questions; consult a dermatologist or plastic surgeon before trying anything invasive. And remember that only surgery reliably removes excess skin; noninvasive options may help only modestly. Bottom line: GHK-Cu–based protocols might improve skin quality a bit, but they’re unlikely to replace surgery for substantial loose skin, and evidence for a meaningful 15–20% tightening after major weight loss is weak.
Source: r/Peptides