Peptide storage: refrigeration, shelf life and travel

There is no single storage rule or shelf life that applies to every peptide. How a vial should be stored and how long it can be used after reconstitution depend on the specific product, the liquid it was mixed with and how it was made. The reliable sources are the product label, the patient leaflet and your pharmacist. What you can do yourself is record those instructions and the dates, so you are never guessing.

Do peptides need to be refrigerated?

Many do. Labels for peptide medicines commonly specify refrigerated storage at 2 to 8 °C (36 to 46 °F), and some allow a limited period at room temperature. Others have different requirements. Read the label for the vial you have, and treat a sealed vial and a reconstituted one as two separate questions, because their instructions usually differ.

General handling points that appear on many labels:

• Keep vials in their carton or otherwise away from light.
• Do not freeze a solution unless the label says you can.
• Do not shake a reconstituted vial; swirl gently if mixing is needed.
• Store away from the fridge door, where the temperature swings most.

How long is a peptide good after reconstitution?

It depends on the product. The usable period after mixing is set by the manufacturer or the pharmacy and can range widely. The expiration date printed on a sealed vial does not apply once liquid has been added.

Two dates are worth recording for every vial:

With the reconstitution date written down, you can apply whatever usable period your label or pharmacist gives, without relying on memory. See how to track vials, lot numbers and expiry dates.

How can I tell if a reconstituted peptide should not be used?

Look at the solution before every use. Standard guidance for injectable products is not to use a solution that:

• is cloudy when it should be clear
• contains particles, flakes or clumps
• has changed colour
• is past its expiration date or its usable period after mixing
• has been stored outside the conditions on the label, for example left out or frozen
• comes from a vial with a damaged stopper or seal

A solution can also degrade without looking any different, which is why the dates matter as much as the appearance. If you are unsure, do not use it and ask your pharmacist.

How do I store peptides when travelling?

• Follow the label's temperature range for the whole journey, not just at each end.
• Use an insulated medication case with cold packs. Keep the vial from touching ice directly so it does not freeze.
• Carry it in your hand luggage. Aircraft holds and parked cars can get very cold or very hot.
• Keep the vial in its original labelled packaging, and carry your prescription or a letter if you have one.
• Check the rules for medicines and needles for your airline and destination before you leave.

Working out whether a vial will be finished in time

Divide the vial strength by your dose for the number of doses, then by doses per week for the number of weeks. If that is longer than the usable period after reconstitution, raise it with your pharmacist. The vial duration calculator gives the run-out date.

Keeping the record

PepVault's vial inventory stores the expiration date, storage conditions, lot number and sealed or reconstituted status of each vial, next to how much is left.

Common questions

Can I use a vial that was left out overnight?

That depends on the product and how warm it got. Check the label, which sometimes states how long the product may be kept at room temperature, or ask your pharmacist.

Does freezing extend the life of a reconstituted vial?

Do not assume so. Freezing can damage some solutions, and many labels say not to freeze. Follow the label.

Why does this guide not give a number of days?

Because a number that is right for one product is wrong for another. The label and your pharmacist are the right source for that figure.