How long do sealed lyophilised peptides remain stable?

Stored sealed, dry and dark at −20 °C or colder, most lyophilised peptides remain within specification for up to 24 months. At 2–8 °C, several months is typical. The certificate of analysis states the batch-specific details.

Freezer or refrigerator?

A freezer at −20 °C is preferred for long-term stock. A refrigerator at 2–8 °C is fine for material you will work with within a few months.

My parcel was at room temperature for a few days. Is the material affected?

No. Lyophilised peptides tolerate ambient transit for days to weeks. Move vials to cold storage on arrival.

The solid looks like a compact cake, not a powder. Is that normal?

Yes. Freeze-drying often leaves a compact cake that may shrink or crack in transit. Colour should be uniform; a visible change in colour or a wet appearance should be reported to us.

Can these products be used in humans or animals?

No. All products are sold for laboratory and research use only and are not for human or veterinary use.

Laboratory reference

Peptide storage & stability guide

How sealed, lyophilised research peptides should be received, logged and stored so the material stays within specification for as long as possible.

For laboratory and research use only. Not for human consumption. This guide covers storage of sealed reference material and is not usage guidance of any kind.

On receipt

Our compounds ship as a lyophilised (freeze-dried) solid in sealed glass vials. Dry material is far more stable than material in solution, so short transit at ambient temperature is expected and does not affect specification.

Check every vial on arrival: seal and cap intact, label legible, batch code matching your order. Then move the vials to their storage location the same day.

Handling sealed vials

01
Inspect
Confirm the seal is unbroken and the solid is a uniform white or off-white cake or powder. Some compounds have a natural tint, which is noted on the product page.
02
Log the batch
Record compound, batch code, receipt date and storage location. A simple log makes results reproducible and problems traceable.
03
Store cold and dark
Place vials in a freezer or refrigerator in their outer box, away from light and away from the door, where temperature swings are smallest.
04
Keep dry
Moisture is the main enemy of lyophilised material. Keep vials sealed, upright and, ideally, in a closed container with desiccant.
05
Let vials reach room temperature
When a cold vial is taken out, leave it closed until it reaches room temperature so no condensation forms on the solid.

Storage conditions

Indicative conditions for sealed lyophilised vials. Always check the compound-specific storage line on the product page and the certificate of analysis.

ConditionTemperatureTypical windowNote

Long-term storage−20 °C or colderUp to 24 monthsPreferred for stock you won't use soon. Keep sealed and dark.

Short-term storage2–8 °CSeveral monthsSuitable for working stock. Avoid the refrigerator door.

Transit / ambient18–25 °CDays to weeksNormal during shipping. Move to cold storage on arrival.

Temperature cycling—AvoidRepeated warm–cold swings invite condensation. Take out only what you need.

What degrades peptides

Heat. Higher temperatures speed up every degradation pathway. Never leave vials on a warm bench or in direct sun.
Moisture. Humidity and condensation start hydrolysis in the dry solid. Keep vials closed and dry.
Light. UV and strong light can oxidise sensitive residues. Store in the outer box or an amber container.
Oxygen. Residues such as methionine and cysteine oxidise in air. An intact seal is the best protection.
Temperature cycling. Each warm–cold cycle risks condensation inside and outside the vial.

Frequently asked questions

Research use only. Products are sold to qualified researchers and licensed laboratories for in-vitro research. Not a drug, food or cosmetic. Not for human consumption.

On receipt

Handling sealed vials

Inspect

Log the batch

Store cold and dark

Keep dry

Let vials reach room temperature