Shelf life & expiry calculator

A vial's clock starts the moment you mix it, and storage changes everything. Pick your situation and see when it expires, how long you have left, and what actually degrades it.

STATE OF THE VIAL HOW IT IS STORED DATE MIXED

—days remaining

These are widely published general stability ranges for reference only — always follow the storage and expiry information from your own supplier, since purity, buffers and preservatives all change the answer. Nothing you type here is stored or sent anywhere.

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General stability ranges

State	Storage	Typical window
Sealed powder	Frozen	2–3 years
Sealed powder	Refrigerated	About 2 years
Sealed powder	Room temperature	A few weeks
Reconstituted	Refrigerated	About 28 days
Reconstituted	Frozen	Up to about 60 days
Reconstituted	Room temperature	A few days

What actually degrades a peptide

Four things, in rough order of how much damage they do:

Heat. The single biggest factor. Every few degrees shortens the window meaningfully, which is why a vial left on a warm windowsill is a write-off.
Light. UV breaks peptide bonds. Keep vials in their box or somewhere dark.
Repeated freeze–thaw. Freezing once is fine; freezing and thawing the same vial over and over is not. If you freeze, split into smaller amounts first.
Agitation. Shaking a mixed vial can denature the protein. Swirl gently, never shake.

Stop guessing the date

Peptide Wizard tracks every vial from the day you mix it, tells you how many doses are left, and notifies you two days before one expires — so you find out before you reach for it, not after.