Ingredient or product comparison
GHK-Cu Complexion Protocol: Application Methods Comparison
Direct topical (dropper to cleansed skin) Stratum corneum + upper dermis (0.1–0.3mm) 90 seconds post-refrigeration removal Daily (AM or PM) Highest bioavailability for at-home use. Minimises oxidation exposure Mixed into serum base (pre-formulated) Variable. D
This source-based comparison does not add ratings or recommend a winner.
- Direct topical (dropper to cleansed skin)
- Stratum corneum + upper dermis (0.1–0.3mm)
- 90 seconds post-refrigeration removal
- Daily (AM or PM)
- Highest bioavailability for at-home use. Minimises oxidation exposure
- Mixed into serum base (pre-formulated)
- Variable. Depends on carrier pH and viscosity
- 7–14 days if stored at 4°C
- Daily
- Convenient but sacrifices freshness. Copper chelation declines in mixed formulations
- Microneedling pre-treatment
- Deep dermis (0.5–1.5mm with 0.5mm needle depth)
- Same 90-second rule applies
- Weekly maximum
- Maximal penetration but requires sterile technique. Infection risk if protocol breached
- Occlusive patch delivery
- Sustained dermal contact (4–8 hours)
- Requires anhydrous formulation to prevent degradation
- 2–3x weekly
- Extends contact time but risks oxidation in non-refrigerated environment