Peptide Skincare & BeautySkin science and ingredient guides

Ingredient or product comparison

GHK-Cu for Skin Brightening Research: Formulation Comparison

Aqueous serum 1–3% Passive diffusion 12–18% Copper oxidation within 30 days at room temperature Best for short-term controlled studies. Requires refrigeration Liposomal suspension 3–5% Lipid vesicle encapsulation 18–25% Extended to 90 days if stored at 4°C Pre

This source-based comparison does not add ratings or recommend a winner.

  • Aqueous serum
  • 1–3%
  • Passive diffusion
  • 12–18%
  • Copper oxidation within 30 days at room temperature
  • Best for short-term controlled studies. Requires refrigeration
  • Liposomal suspension
  • 3–5%
  • Lipid vesicle encapsulation
  • 18–25%
  • Extended to 90 days if stored at 4°C
  • Preferred for clinical trials requiring extended treatment duration
  • Anhydrous oil base
  • 2–4%
  • Oil-phase solubilisation
  • 10–15%
  • Stable 6+ months at room temperature
  • Lower efficacy but suitable for long-term consumer formulations
  • Microneedling delivery
  • 5–10%
  • Direct dermal deposition
  • 25–32%
  • Single-use preparation only
  • Highest efficacy but requires clinical administration