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Storing lyophilised peptides

How freeze-dried research peptides are normally stored and handled, and what affects their stability.

Lyophilised means freeze-dried. Removing water makes a peptide far more stable, but storage still matters.

What affects stability

• Heat. Higher temperatures speed up breakdown.
• Moisture. Freeze-dried powder draws in water from the air once a vial is opened.
• Light. Direct light can degrade some peptides.

General laboratory practice

• Keep unopened vials cold. A freezer is the usual choice for long-term storage and a fridge for the short term.
• Keep vials in their box, away from light.
• Let a cold vial reach room temperature before opening it, so condensation does not form inside.
• Record the batch number and the date the vial was received.

In transit

Freeze-dried peptides are generally stable at ambient temperature for the short time a parcel spends in the post. Put vials into cold storage when they arrive.

Checking what arrives

• The seal and cap should be intact.
• The powder is normally a white cake or loose white powder. Appearance can vary between batches.
• The batch number on the vial should match your paperwork and the certificate.

If anything looks wrong, contact us before opening the vial. Our delivery and returns page explains what happens next.

This guide describes storage of a research compound. It is not guidance on use in people or animals.

Published 2026-11-13. Reviewed 2026-11-13. Written by the Peps for Pups team. General information, not veterinary advice.

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