How should research peptides be stored?
4 min read · Updated May 2026
Storage is one of the simplest ways to protect the integrity of a research peptide — and one of the easiest things to get wrong. Peptides are sensitive to heat, light, moisture and repeated temperature swings, all of which can degrade the molecule before it ever reaches an assay.
Research use only. This guide covers laboratory storage and handling only. It does not describe preparation methods, volumes, dosing, or any human or animal use.
Lyophilised vs in-solution
Most research peptides are supplied lyophilised (freeze-dried) because the dry form is far more stable than a solution. In this state, kept cold and dry and protected from light, peptides remain stable for extended periods. Once a peptide is in solution it is considerably less stable, so it is kept refrigerated (typically 2–8°C) and used within a limited window.
Practical handling
- Keep the cold chain. Refrigerate vials on arrival (MY PEPTIDES products are labelled for 2–8°C storage); for long-term storage of lyophilised material, colder is better.
- Avoid freeze–thaw cycles. Repeated thawing and refreezing degrades peptides — aliquoting reduces how often a stock is disturbed.
- Protect from light and moisture. Keep vials sealed and shielded from direct light.
- Label and date everything. Stability depends on time as well as temperature.
Why it matters for results
Degraded material introduces an unknown variable. Pairing correct storage with a verified starting material — confirmed by a Certificate of Analysis — is what lets a researcher attribute results to the compound rather than to handling artefacts.
Browse the catalogue — every product is labelled with its storage conditions and ships with a COA.