Ingredient or product comparison
GHK-Cu Storage Method Comparison — Refrigeration vs Freezing vs Room Temp
Refrigeration (Recommended) 2–8°C 28 days Low. Approx 5–8% loss over 28 days Moderate. Depends on container and sealing Optimal balance of stability and accessibility. The standard for reconstituted peptides Freezing (−20°C) −15 to −25°C Up to 90 days Very low
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- Refrigeration (Recommended)
- 2–8°C
- 28 days
- Low. Approx 5–8% loss over 28 days
- Moderate. Depends on container and sealing
- Optimal balance of stability and accessibility. The standard for reconstituted peptides
- Freezing (−20°C)
- −15 to −25°C
- Up to 90 days
- Very low. Degradation nearly halted
- Low. Oxidation slowed significantly
- Extends shelf life but introduces freeze-thaw stress. Acceptable if vial is aliquoted into single-use portions before freezing
- Room Temperature
- 18–25°C
- 3–7 days maximum
- High. 30–40% loss in first week
- High. UV and oxygen both accelerate degradation
- Never appropriate for GHK-Cu after reconstitution. Use immediately or discard
- Freezing Without Cryoprotectant
- −20°C
- Unreliable. Peptide may precipitate
- Moderate. Ice crystals can shear peptide bonds
- Low during storage, high upon thawing
- Not recommended. Requires glycerol or DMSO as cryoprotectant, complicating research use