Peptide Storage Best Practices for Research Labs

Most lyophilized research peptides remain stable for extended periods when stored correctly: at -20°C, in a sealed, light-protected container, away from humidity.

Repeated freeze-thaw cycles can degrade peptide structure over time. Where possible, aliquot reconstituted solutions into single-use volumes before freezing, rather than refreezing a partially-used vial.

Light exposure — particularly UV — can degrade certain peptide bonds. Always store vials in their original packaging or an opaque container, and minimize the time vials spend at room temperature during handling.

Once reconstituted with bacteriostatic water, most peptide solutions remain stable under refrigeration (2-8°C) for a limited window, typically outlined in the product's technical data sheet. Always label reconstituted vials with the date of reconstitution.

Following these practices helps ensure that the compound you're working with at the end of your study matches the specifications on the original Certificate of Analysis.