Ingredient or product comparison
GHK-Cu Storage Requirements: Product Form Comparison
Different GHK-Cu product forms have distinct storage requirements based on water content, formulation vehicle, and copper oxidation state. This table compares stability profiles and storage protocols across the most common formats. Lyophilised powder (unrecons
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- Different GHK-Cu product forms have distinct storage requirements based on water content, formulation vehicle, and copper oxidation state. This table compares stability profiles and storage protocols across the most common formats.
- Lyophilised powder (unreconstituted)
- −20°C (freezer)
- 18–24 months
- N/A—stable until reconstituted
- Copper oxidation if seal breaks; minimal hydrolysis
- Most stable form; refrigeration mandatory post-reconstitution
- Reconstituted aqueous solution
- 2–8°C (refrigerator)
- N/A—use within 35 days of reconstitution
- 28–35 days at 4°C
- Peptide bond hydrolysis, copper dissociation, bacterial contamination
- Requires amber vial, sterile technique, consistent cold chain
- Pre-formulated serum (water-based)
- 6–12 months at 4°C
- 60–90 days refrigerated after opening
- pH drift, preservative depletion, light-catalysed oxidation
- Convenience vs stability trade-off; must refrigerate
- Cream or emulsion (oil-water)
- 6–9 months at 4°C
- 45–60 days refrigerated after opening
- Emulsion destabilisation, copper sequestration by fatty acids
- Lipid phase slows water-phase hydrolysis but creates new risks
- Anhydrous formulation (oil-only, rare)
- Room temperature acceptable (15–25°C)
- 12–18 months
- 6–12 months
- Copper oxidation only (no hydrolysis without water)
- Theoretically most stable but poor skin penetration
- The "Bottom Line" column reveals the storage dilemma: lyophilised powder offers maximum stability but requires reconstitution skill; pre-formulated serums offer convenience but shorter active life even with refrigeration. For researchers prioritising reproducibility, lyophilised GHK CU Cosmetic 5MG stored at −20°C until the day of reconstitution eliminates batch-to-batch variability from storage degradation.