Do peptides need to be refrigerated?

Peptide stability is primarily a function of temperature and whether the compound has already been dissolved.

Before reconstitution, lyophilised peptides are shipped and stored refrigerated, and most remain stable at that temperature for a considerable time. Freezing extends this further, though repeated freeze-thaw cycling should be avoided.

After reconstitution, the peptide is far more sensitive to temperature and light. Refrigeration (not freezing, and not room temperature) is the standard storage recommendation once a vial has been mixed with bacteriostatic water.

For the full process, see our guide on storing and handling research peptides.