Informational use only — not medical advice. For adults 21 and over. Talk to a qualified healthcare professional before making decisions about medications or supplements.

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Peptide storage and refrigeration

Peptides are chains of amino acids, and chains break. Heat, light, repeated freeze-thaw and time all shorten them. Storage is the one part of the process that costs nothing to get right and everything to get wrong.

Informational use only — not medical advice. Check every figure against your own product and talk to a licensed healthcare provider before starting or changing anything.

Before reconstitution (dry powder)

Short term (weeks): refrigerator, 2–8 °C, in the box, out of light.
Long term (months): freezer at −20 °C. Lyophilised powder tolerates freezing well; keep it sealed so moisture does not get in.
Let a cold vial come to room temperature before you open it, so condensation does not form on the powder.

After reconstitution (mixed vial)

Refrigerate immediately. 2–8 °C, upright, away from the door where the temperature swings.
Do not freeze. Ice crystals damage the peptide in solution.
Use within about four weeks. That is the working rule Dosify Me uses for its discard countdown. Some compounds are more fragile; check the compound page.
Keep it dark. Wrap the vial or keep it in its box. UV light degrades most peptides.
Swirl, never shake when you draw, and wipe the stopper each time.

Travel and heat

An insulated pouch with a cold pack holds a mixed vial safely for a day or two. Do not leave vials in a car or a bag in the sun. If a vial has been warm for hours, treat it as suspect.

How the app helps

Every compound card in Dosify Me carries the storage note for that compound. The vial inventory records when you reconstituted each vial, counts down to its discard date, warns three days out and on the day, and keeps a count of the unopened vials you still have on hand. The vial countdown on the home screen shows doses left so you reorder before you run dry.

Questions people ask

How long does a reconstituted peptide last in the fridge?

As a working rule, about four weeks at 2–8 °C for most peptides mixed with bacteriostatic water. Some are more fragile. Dosify Me's vial inventory sets a discard date per vial and reminds you on the day.

Can I freeze a reconstituted peptide?

Avoid it. Freezing and thawing a solution can break the peptide. Freeze the dry powder if you need long storage; refrigerate once mixed.

Does bacteriostatic water make it last longer?

It stops bacteria growing in a vial you keep puncturing. It does not stop the peptide itself degrading, which is why the four-week rule still applies.

How do I know a vial has gone bad?

Cloudiness, visible particles, a colour change, or a dose that stopped doing what it did. When in doubt, discard it; a vial is cheaper than a bad month.

Dosify Me does this math for you. Pick the compound, your vial size and dose, and the app draws the exact syringe reading, keeps your schedule and reminders, and logs every dose — privately, on your phone.

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Published 2026-10-08.