Ingredient or product comparison
GHK-Cu Skin Elasticity Mechanism: Formulation Comparison
Anhydrous serum (silicone base) 1–3% GHK-Cu High. Minimal oxidation 18–24 months Stratum corneum + upper epidermis Phase 2 trials (200+ subjects) Aqueous cream (emulsion) 0.5–2% GHK-Cu Moderate. Requires chelators/antioxidants 6–12 months (refrigerated) Epider
This source-based comparison does not add ratings or recommend a winner.
- Anhydrous serum (silicone base)
- 1–3% GHK-Cu
- High. Minimal oxidation
- 18–24 months
- Stratum corneum + upper epidermis
- Phase 2 trials (200+ subjects)
- Aqueous cream (emulsion)
- 0.5–2% GHK-Cu
- Moderate. Requires chelators/antioxidants
- 6–12 months (refrigerated)
- Epidermis only
- Case series, observational
- Lyophilized powder (reconstituted)
- 5–10% GHK-Cu
- Very high. Freshly prepared
- 7–14 days post-mix
- Dermis (with microneedling)
- In vitro + small cohort (n<50)
- Liposomal encapsulation
- 1–2% GHK-Cu
- High. Protected from degradation
- 12–18 months
- Dermis (passive)
- Preclinical + pilot studies
- Formulation determines whether the peptide reaches its target. GHK-Cu is water-soluble but also copper-dependent, which creates a stability problem: free copper ions catalyze oxidation reactions that degrade both the peptide and surrounding ingredients. Anhydrous formulations solve this by eliminating water entirely, but they sacrifice ease of use. Aqueous formulations are more cosmetically elegant but require antioxidant systems (vitamin E, ferulic acid) to maintain potency. Lyophilized powders offer the highest activity but must be used within days of reconstitution. At Real Peptides, every research-grade peptide is supplied with third-party purity verification and storage guidance that reflects these stability constraints.