Peptide Stability & Shelf-Life Estimator

A free, visual estimator for how peptide integrity changes over time in storage. Choose whether your material is lyophilized (powder) or reconstituted (in solution), and compare how it holds up in the freezer, the fridge, and at room temperature. This is a general educational model based on standard degradation chemistry — not compound-specific lab data. For laboratory research use only.

RESEARCH USE ONLY — ILLUSTRATIVE ESTIMATE. This is a general educational model of molecular degradation, not compound-specific laboratory data or a guarantee. Actual stability varies by peptide, formulation, pH, light and freeze-thaw. Not medical, dosing, or usage guidance.
Storage form
Freezer (−20°C) Fridge (4°C) Room (22°C)
Time in storage:
—
Freezer −20°C
—
Fridge 4°C
—
Room 22°C
Estimated molecular integrity remaining at the selected time.
Email me this result
Get your result in your inbox, plus a heads-up when we release new tools. No spam.

How to read this

Peptides don't spoil at a single expiry date — they degrade gradually, and temperature is the biggest lever. This tool models that with two well-established ideas from chemistry:

  • First-order decay — a constant fraction is lost per unit time, so integrity follows a smooth downward curve (not a cliff).
  • Temperature scaling (Arrhenius / Q10) — every ~10°C colder roughly multiplies how long the material lasts. That's why the freezer, fridge and room-temperature curves fan out so dramatically.

The practical takeaways most researchers care about:

  • Lyophilized powder, frozen is by far the most stable state — often years.
  • Reconstituted in the fridge is the common working state; integrity slips gradually over weeks.
  • Room temperature, reconstituted degrades the fastest — days, not weeks.

Important: the numbers here are an illustrative general model, not measurements for your specific peptide or lot. Real degradation depends on the exact sequence, buffer/pH, light exposure, and freeze-thaw cycles. Always store material as cold as practical, minimize freeze-thaw, and work from your material's own Certificate of Analysis — see how to read a COA and how to store peptides. Reconstituting a fresh vial? Use the free reconstitution calculator.

Sponsor disclosure: reference materials for the compounds discussed on this site are supplied strictly for laboratory research use only by NovaForge Labs — third-party HPLC-tested with a published Certificate of Analysis for every lot. NovaForge Labs is a sponsor of The Peptide Review. This tool is an educational estimate and does not constitute dosing, usage, or storage guarantees.

Frequently asked questions

How long do peptides last after reconstitution?
It depends on the specific compound and the storage temperature. As a general research reference, lyophilized peptide is stable for months when frozen, while reconstituted peptide in solution is typically used within weeks and kept refrigerated. This estimator gives a temperature-based approximation.
How should reconstituted peptides be stored?
Refrigerated and away from light. Heat and light are what drive degradation, and time at room temperature should be minimized.
Does freezing reconstituted peptide damage it?
Repeated freeze-thaw cycles degrade peptide integrity. A common research practice is to aliquot into smaller portions before freezing so the whole batch isn't thawed each time.