CYOU — 1% GHK-Cu
Copper Peptide Serum.
1% pharmaceutical-grade GHK-Cu — the concentration that actually works. 94% saw visibly firmer skin in 4 weeks.
GHK-Cu Advanced Repair Serum
Visibly firms, smooths texture, and supports skin recovery — at a concentration that makes a real difference.
- Visibly firmer skin in 4 weeks
- 33% fewer deep forehead lines
- 1.6× faster skin recovery
Your skin makes GHK-Cu. It just makes less every year.
GHK-Cu levels drop 60% between your 20s and 60s — accelerating collagen loss and visible ageing. CYOU uses pharmaceutical-grade GHK-Cu at 1% concentration. Most mass-market serums use 0.1%.
Learn the science →
Real skin. Unretouched.
Twice daily use for 8 weeks. No other new actives during the trial period.
Sarah, 48 · dry-normal skin · week 0 vs week 8
Unretouched · individual results vary
What customers say312 reviews · 4.9 avg
"By week 5 the lines around my eyes had visibly softened. Nothing else I've tried has done that."
"My skin texture completely changed in about 6 weeks. Smoother than it's been in years."
"I have very reactive skin and this didn't irritate it at all. Started seeing firmness results by week 4."
"I was sceptical but the results are real. My husband even commented on how my skin looked 'brighter'. Sold."
"Worth every cent. I've spent hundreds on department store serums that did nothing compared to this."
"The drop in fine lines around my mouth is genuinely noticeable. I keep checking the mirror in disbelief."
"Finally a serum that actually absorbs instead of sitting on top of my skin. And the results speak for themselves."
"I'm on my third bottle. The improvement in skin elasticity has been consistent month after month."
"My dermatologist asked what I'd changed. When I told her she said 'that's the concentration that works'."
The science behind 1% GHK-Cu
What it does, how to use it, and why concentration matters.
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