Ingredient or product comparison
GHK-Cu for Skin Care Enthusiasts: Comparison — Research vs Commercial Formulations
Purity (peptide) >98% via HPLC 40–85% (manufacturer claim, unverified) Often undisclosed Only research-grade purity guarantees the published mechanism works as intended Copper chelation verification Mass spec confirmed 1:1 molar ratio Rarely tested post-synthe
This source-based comparison does not add ratings or recommend a winner.
- Purity (peptide)
- >98% via HPLC
- 40–85% (manufacturer claim, unverified)
- Often undisclosed
- Only research-grade purity guarantees the published mechanism works as intended
- Copper chelation verification
- Mass spec confirmed 1:1 molar ratio
- Rarely tested post-synthesis
- May contain free copper salts
- Unchelated copper generates ROS and causes irritation. Not therapeutic benefit
- Delivery system
- Liposomal or emulsion with penetration enhancer
- Water-based gel or cream (insufficient penetration)
- Variable, often proprietary blends with no published data
- Without liposomal or chemical penetration enhancement, peptide remains on skin surface
- Concentration
- 0.05–0.1% (clinically validated range)
- Often 1–5% (misleading. Includes inactive forms)
- Undisclosed or listed as 'proprietary blend'
- Higher numbers don't mean higher efficacy when purity is low
- Storage stability
- Stable 6–12 months at 2–8°C, light-protected
- Degrades in 3–6 months at room temperature
- Unknown. No stability data provided
- Oxidized GHK-Cu is inactive. Pump bottles and opaque packaging are non-negotiable
- Published efficacy data
- Multiple peer-reviewed trials in humans
- Typically none. Marketing claims cite the ingredient, not the formulation
- None
- If the exact formulation hasn't been tested, efficacy claims are speculative