Proper Peptide Storage

Peptides are fragile molecules. Heat, light, and repeated freeze-thaw cycles all accelerate degradation. Here’s how to keep them intact.

Lyophilized (powder) state

• Store refrigerated (2–8 °C) for short-to-medium term use.
• For long-term storage (months to years), freeze at −20 °C.
• Protect from light; keep the vial in its box or wrapped in foil.

Lyophilized peptides are remarkably stable. Most remain potent for 1–2 years refrigerated.

Reconstituted state

• Refrigerate immediately (2–8 °C).
• Use within the window appropriate to your diluent: ~24 h for sterile water, up to ~30 days for bacteriostatic water.
• Never freeze a reconstituted peptide — ice crystals shear and denature the molecule.

Transport

Use an insulated container with a cold pack during transport. Never leave peptides in a hot vehicle.