How to Store Peptides: Lyophilized Powder and Shelf Life
Lyophilized (freeze-dried) peptide powder is generally most stable when kept cold, dry and away from light, following the supplier's guidance for that lot. Once a peptide is dissolved, its stability is much shorter, so solutions are labelled with the date and kept refrigerated.
Why Storage Matters
Peptides can degrade through moisture, heat, light and repeated temperature changes. Good storage protects what the certificate of analysis measured at the time of testing.
Lyophilized Powder
- Cold and dry: keep sealed vials cool, and protect them from moisture
- Away from light: store in a box or drawer
- Sealed until needed: opening the vial lets in air and moisture
- Follow the lot's documentation for the recommended temperature
After Dissolving in the Laboratory
Dissolved peptides are far less stable than the powder. Label every vial with the contents and the date, keep it refrigerated, protect it from light and avoid repeated freeze-thaw cycles. Use within the timeframe given for that peptide.
Shelf Life
Shelf life depends on the peptide, the purity and how it is stored, so no single number applies to every peptide. The lot's documentation is the best guide.
Keep Learning
Browse the peptide library, compare peptides and read plain-English guides on lab testing and Canadian rules.
More Questions
How long do lyophilized peptides last?
It depends on the peptide and storage, and the supplier's lot documentation is the best guide. Cold, dry, dark storage in a sealed vial gives the longest stability.
Should peptides be stored in the fridge or freezer?
Follow the supplier's guidance for that lot. Many lyophilized peptides are stored cold, while dissolved solutions are kept refrigerated and used within a limited time.
Do peptides go bad?
Yes. Moisture, heat, light and repeated freeze-thaw cycles can degrade peptides, which is why storage and dating of solutions matter.
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Educational information only, not medical or legal advice. Information on this site is educational only and is not medical advice.