Peptide Storage and Stability: Keeping Your Research Vials Sound

Lyophilized peptides are built to last — that’s the whole reason they’re freeze-dried. But the storage rules shift the moment you add water, and getting that transition wrong is how expensive research material gets ruined.

Dry powder: cold and dry

Lyophilized peptides are stable at −20 °C for extended periods. Two enemies:

1. Heat — every degree shortens the shelf life.
2. Moisture — the powder is hygroscopic; a humid vial is a degraded vial.

Keep vials sealed in their original packaging, away from freezer frost, and only open them at room temperature (let the vial warm before breaking the seal, so condensation doesn’t form on the powder).

Reconstituted: cold, not frozen

Once dissolved in bacteriostatic water, the rules change:

• Store at 2–8 °C (refrigeration).
• Use within the stability window on the Certificate of Analysis.
• Do not freeze-thaw reconstituted solutions — ice crystal formation and repeated phase changes stress the peptide.

If a protocol needs multiple portions, aliquot before reconstituting into sterile vials, or reconstitute the full vial and portion the solution per the COA window.

The storage-vs-reconstitution interplay

Storage choice depends on what stage the material is in — and the reconstitution calculator presets mirror the catalog’s storage specs. The reconstitution guide covers the solvent side; the bacteriostatic water guide covers why that solvent is standard.

Practical rules

• Write the reconstitution date on the vial.
• Use a fresh syringe per draw — contamination is the quiet killer.
• Check the COA: it lists both the lyophilized and solution stability expectations.

Full storage specs are on each product page — BPC-157, TB-500, GHK-Cu.

For laboratory research use only. Not medical advice.