Ingredient or product comparison
GHK Copper Peptide Same as GHK-Cu: Formulation Comparison
Before ordering any peptide for research, cross-reference the molecular weight, CAS number, and copper content specification to confirm the supplier is delivering the compound the literature describes. The table below compares the standard identity markers for
This source-based comparison does not add ratings or recommend a winner.
- Before ordering any peptide for research, cross-reference the molecular weight, CAS number, and copper content specification to confirm the supplier is delivering the compound the literature describes. The table below compares the standard identity markers for GHK-Cu regardless of which name appears on the label.
- Amino Acid Sequence
- Gly-His-Lys (tripeptide)
- HPLC sequencing + mass spec
- Identical. Both are the same three amino acids in the same order
- Molecular Weight
- ~404 Da (complexed form)
- ESI-MS or MALDI-TOF
- Identical. Any deviation >2 Da indicates impurity or incorrect complexation
- CAS Registry Number
- 49557-75-7
- Supplier documentation
- Identical. Same CAS number means same chemical entity
- Copper Content
- 1 Cu²⁺ per peptide (15.7% by mass)
- ICP-MS or atomic absorption
- Identical. Verified copper stoichiometry is the only proof of proper complexation
- Solubility Profile
- Water-soluble at pH 5.0–7.4
- Dissolution testing in PBS
- Identical. Both dissolve readily in aqueous buffers at physiological pH
- Storage Requirements
- −20°C lyophilized, 2–8°C reconstituted
- Stability testing per ICH Q1A
- Identical. Storage conditions are dictated by peptide stability, not nomenclature