GHK-Cu is a copper peptide your body makes naturally — part of how skin signals its own repair — and levels decline from your twenties onward. Applied at a real concentration, it supports the look of firmer, smoother skin: softened fine lines, more even tone, and a stronger-feeling barrier, building week on week. Read the science →

The dose. Most "copper peptide" serums carry around 0.05–0.1% — too little to change anything — then pad the label with filler botanicals. Koppā is a clinical 2% (20,000 ppm): no filler, fragrance-free, and every batch third-party tested. See the testing →

Most people see smoother texture and better hydration within 2–3 weeks, with firmness and fine-line changes building from week four — 93% see visible results in 28 days. And you're covered either way: every order carries a 30-day money-back guarantee, so the only real risk is staying on a routine that isn't working. Start with the Trio — save 15% →

GHK-Cu is the copper peptide your skin uses to switch on its own repair — collagen, elastin and a stronger barrier. Retinol forces cell turnover (and often irritation); vitamin C is a surface antioxidant. GHK-Cu supports the look of firmer, smoother skin from within, which is why it keeps working after other actives plateau. Read the science →

Yes. GHK-Cu isn't an acid, retinoid or exfoliant — no purging, no peeling, no sun-sensitivity. It reinforces your barrier instead of stressing it, so it layers comfortably morning and night, even on sensitive skin. Reactive skin? Start with the Capsule Cream and build up.

GHK-Cu degrades with heat, light and the wrong co-ingredients — clear "copper peptide" products have usually lost most of theirs. Ours stays active three ways: the deep blue colour is the copper, so you can see it's intact; a high-purity stabiliser protects it from bottle to skin; and every batch is third-party tested, so the 2% on the label is the 2% that reaches your skin. See our testing & transparency →

Anyone starting to notice loss of firmness, fine lines or dullness — usually from your late twenties on. Because it isn't an acid or retinoid, it suits sensitive and barrier-compromised skin that can't tolerate stronger actives. Not sure where to start? Take the two-minute routine quiz → or see the men's routine.