The Storage Rule Every Lab Should Follow
Lyophilized (freeze-dried) research peptides should be stored at -20°C, protected from light and moisture, and only reconstituted immediately before use. Freeze-dried peptide is remarkably stable when kept dry and cold; the stability problems begin the moment you add water.
Most premature peptide degradation is caused by one of three things: moisture getting into the vial, repeated freeze-thaw cycles after reconstitution, or storage at room temperature. All three are avoidable.
Before and After Reconstitution
- Lyophilized, sealed: -20°C, stable long-term when moisture-free
- After reconstitution: refrigerate at 4°C, use within the supplier’s stated window
- Never re-freeze: reconstituted solution degrades with each freeze-thaw cycle
- Avoid light: UV exposure accelerates breakdown
What Packaging Tells You About Quality
Vacuum-sealed glass vials with inert gas (argon or nitrogen) protect lyophilized peptides far better than loose plastic containers. If your supplier ships in non-sealed plastic, that’s a signal about their overall quality standards.
FAQ
How long do lyophilized peptides last in storage?
Lyophilized peptides stored dry at -20°C can remain stable for years, though always defer to the supplier’s stated shelf life.
Can I re-freeze a reconstituted peptide?
No — repeated freeze-thaw cycles degrade reconstituted peptide. Reconstitute only what you’ll use promptly.
Does the vial type matter for storage?
Yes — vacuum-sealed glass with inert gas extends shelf life versus loose plastic packaging.
Important: All products are sold strictly for laboratory and research purposes only — not for human or veterinary use. No medical or dosing guidance is provided.