Ingredient or product comparison
GHK-Cu Results After 2 Weeks: Measurable vs Visible Changes
Dermal blood flow +15–25% increase from baseline +30–40% sustained +35–45% sustained Laser Doppler flowmetry Transepidermal water loss (TEWL) 12–18% reduction 25–35% reduction 30–40% reduction Corneometer or evaporimeter Collagen density (dermis) No measurable
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- Dermal blood flow
- +15–25% increase from baseline
- +30–40% sustained
- +35–45% sustained
- Laser Doppler flowmetry
- Transepidermal water loss (TEWL)
- 12–18% reduction
- 25–35% reduction
- 30–40% reduction
- Corneometer or evaporimeter
- Collagen density (dermis)
- No measurable change
- +8–12% increase
- +18–25% increase
- High-frequency ultrasound
- Wrinkle depth (crow's feet)
- 10–15% reduction
- 20–30% reduction
- 3D optical profilometry
- Elastin fiber integrity
- Minimal improvement
- Moderate improvement
- Significant improvement
- Immunohistochemistry (biopsy)
- Professional Assessment
- Hydration and tone improvement only. No structural remodelling yet. The visible 'glow' is vascular, not collagen-driven.
- Early structural changes detectable via imaging but not yet obvious to untrained eye. Texture improvement becomes noticeable.
- Clear improvement in skin firmness, wrinkle depth, and elasticity. Results now align with user expectations.
- The hydration and microcirculation improvements users notice within two weeks are legitimate. They're just not the primary therapeutic outcome. Think of them as leading indicators: if you're seeing better hydration and reduced redness by day 10–14, it confirms the peptide is bioavailable and metabolically active. The collagen remodelling downstream from that activity will follow on the expected timeline. Conversely, if you see zero change in hydration or tone after two weeks, either the formulation lacks adequate copper peptide concentration, the delivery system isn't penetrating stratum corneum effectively, or the product has degraded during storage.