Peptide Storage Guide: How to Maximise Stability

Why Storage Matters

Peptides are sensitive biomolecules. Incorrect storage — particularly exposure to heat, moisture, light, or repeated freeze-thaw cycles — can cause degradation, oxidation, and loss of structural integrity, rendering them unsuitable for research.

Lyophilised (Freeze-Dried) Peptides

Lyophilised peptides are the most stable form. When stored correctly:

Best practice: Store at −20°C until needed. Bring to room temperature before opening to prevent condensation from entering the vial.

Reconstituted Peptides

Once dissolved in bacteriostatic water, peptides are significantly less stable:

Key Storage Rules

1. Avoid repeated freeze-thaw cycles — each cycle degrades the peptide. Use single-use aliquots if needed.

2. Protect from light — UV can break peptide bonds. Store in amber vials or wrapped in foil.

3. Keep dry — lyophilised peptides are hygroscopic (absorb moisture). Do not open vials in humid environments.

4. Label everything — include compound name, batch number, concentration (if reconstituted), and date.

5. Use desiccant — store multiple lyophilised vials in a container with desiccant packets.

Peptide-Specific Notes

• •GHK-Cu: The copper complex is relatively stable but protect from oxidation — store under inert atmosphere if long-term storage is required.
• •NAD+: Particularly sensitive to moisture and light. Store desiccated at −20°C.
• •Melanotan I/II: Protect from light exposure, which can cause photodegradation.
• •Retatrutide: As a larger peptide, follow strict cold-chain protocols from receipt.

Disclaimer: All information is for educational purposes related to in-vitro laboratory research. Not intended as medical advice.