Ingredient or product comparison
GHK-Cu Cosmetic Research: Formulation vs Mechanism Comparison
Optimal Concentration Range 1–10μM for fibroblasts, 0.1–5μM for keratinocytes 50–200μM applied topically (accounts for penetration barrier) 0.5–2% w/w in finished product (500–2000ppm) Cell culture uses bioavailable concentrations; clinical formulations must a
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- Optimal Concentration Range
- 1–10μM for fibroblasts, 0.1–5μM for keratinocytes
- 50–200μM applied topically (accounts for penetration barrier)
- 0.5–2% w/w in finished product (500–2000ppm)
- Cell culture uses bioavailable concentrations; clinical formulations must account for stratum corneum barrier reducing penetration 50–100×
- pH Requirement
- 7.0–7.4 (matches culture medium)
- 5.5–6.5 (matches skin surface pH)
- 5.0–6.0 (cosmetic stability and skin compatibility)
- In vitro pH doesn't predict formulation pH. Skin penetration requires acidic pH that would kill cells in culture
- Storage Stability Window
- 5–7 days at 4°C in serum-free medium
- 24–48 hours once applied to tissue
- 12–24 months in finished product with preservatives and antioxidants
- Aqueous solutions are inherently unstable; finished cosmetic formulations use chelating agents and pH buffers to extend shelf life
- Primary Endpoint Measured
- Gene expression (RT-qPCR), protein synthesis (ELISA), cell proliferation (MTT assay)
- Histological changes (collagen density via Masson's trichrome), barrier function (TEWL)
- Clinical grading (wrinkle depth via profilometry), patient-reported outcomes, photography
- Each model answers different questions. Cell culture for mechanism, explants for tissue-level effects, clinical for real-world efficacy