Ingredient or product comparison
Cosmetic vs Systemic GHK-Cu: Application-Specific Formulation Comparison
The table below maps cosmetic GHK-Cu against systemic pharmaceutical-grade GHK-Cu across the parameters that matter for research design. Use this to verify you're ordering the correct grade for your protocol. Purity (HPLC) >95% >98% Both grades meet research s
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- The table below maps cosmetic GHK-Cu against systemic pharmaceutical-grade GHK-Cu across the parameters that matter for research design. Use this to verify you're ordering the correct grade for your protocol.
- Purity (HPLC)
- >95%
- >98%
- Both grades meet research standards; systemic slightly higher for injection safety
- Endotoxin Limit
- <10 EU/mg
- <0.5 EU/mg
- Cosmetic adequate for topical; systemic required for injection or compromised barriers
- Salt Form
- Acetate or chloride
- Lyophilized free base
- Acetate improves aqueous solubility for dermal formulations; free base for injection
- Excipients
- May include preservatives (phenoxyethanol, parabens)
- Sterile, excipient-free
- Cosmetic excipients are cytotoxic if injected; systemic is preservative-free by design
- Intended Use
- Topical application, dermal studies, cosmetic formulation
- Subcutaneous/IM injection, systemic pharmacokinetics
- Match grade to administration route. Cosmetic for skin, systemic for injection
- Copper Content Verification
- Batch-reported at reputable suppliers
- Batch-reported with CoA
- Both should report elemental copper; reject any supplier without Cu²⁺ assay data
- Reconstitution Vehicle
- Sterile water or PBS, pH 6.5–7.0
- Bacteriostatic water, pH 6.0–7.5
- Do not mix: bacteriostatic water denatures cosmetic; preservatives harm systemic
- Stability Post-Reconstitution
- 28 days at 2–8°C
- 28–60 days at 2–8°C depending on preservative
- Both degrade without refrigeration; systemic has slightly longer shelf life with BAC water
- Regulatory Classification
- Cosmetic ingredient (not FDA drug-approved)
- Research-grade or compounded under 503B (not FDA drug-approved as standalone product)
- Neither is FDA-approved as a drug product; both are legal for research or compounding use
- Cosmetic GHK-Cu is not a 'lesser' peptide. It's a formulation optimized for a specific delivery route. The molecular activity of GHK-Cu in fibroblast proliferation assays is identical whether you use cosmetic or systemic grade, provided both maintain copper chelation integrity. What changes is how you prepare, store, and administer it.