How to Store Lyophilized Research Peptides

The short version

• Keep the vial sealed.
• Store it at −20 °C (−4 °F), the temperature it ships at and the guidance on our product pages.
• Keep it away from light and moisture.
• Let it reach room temperature before opening.
• Avoid repeated warm-and-cold cycles.
• Record the batch number and the date received.

Why temperature matters

Lower temperatures slow chemical degradation, so freezer storage is the usual choice for lyophilized peptides held for longer periods. Refrigeration (2 to 8 °C) is commonly used for short periods. If the label or COA gives batch-specific instructions, follow those first.

Moisture is the main enemy

Dry peptide powder absorbs water from the air. Opening a cold vial in a warm room lets moisture condense on the powder, so allow the sealed vial to reach room temperature first, typically 20 to 30 minutes. Keeping vials in a sealed container with a desiccant adds protection.

Light and air

Keep vials in the dark, in their packaging or a closed box. Some amino acids, such as methionine, cysteine and tryptophan, are more prone to oxidation, so avoid leaving vials open to air.

The freezer itself

A manual-defrost freezer holds a steadier temperature than a frost-free model, which warms periodically to melt frost. Store vials toward the back, away from the door.

Signs of a problem

• A cake that has collapsed, shrunk away from the glass, or turned sticky or damp.
• Discolouration, such as yellow or brown.
• A broken seal, a popped stopper, or condensation inside the vial.
• A vial that arrived warm, with no cold packs.

If you see any of these, record the batch number and contact the supplier.

This guide covers the dry, sealed product only. Handling dissolved material is outside its scope and belongs in a qualified laboratory under its own written procedures.