Peptide shipping methods explained: ambient, cold pack and dry ice, and the labels you should see

Three ways a peptide parcel can travel

Ambient shipping means no temperature control: the vial travels at whatever temperature the parcel network sees. Cold-pack shipping adds refrigerant gel packs in an insulated box, which slows warming but does not hold a fixed temperature. Dry-ice shipping packs solid carbon dioxide around the contents to keep them frozen, and it is the only one of the three that brings hazardous-materials rules with it.

For dry lyophilized peptide, manufacturer storage guidance is about long-term storage, not transit: Bachem says below -15 C, GenScript -20 C. [5] [6] ICH Q1A(R2) treats short excursions during shipping as a separate question, answered by testing a batch at an elevated temperature such as 5 C or 25 C. [4] Peptides EU states that lyophilised peptides remain stable at ambient temperatures for normal transit durations. [3] That is a supplier statement, not a stability study you can inspect, so the practical check is how long your parcel was actually in transit.

What a dry-ice box must show

In the United States, 49 CFR 173.217 sets the hazardous-materials rules for dry ice offered for transport by aircraft or water. For both, packaging must be designed and constructed to permit the release of carbon dioxide gas so pressure cannot build up and rupture it. [1] For aircraft, the net mass of dry ice must also be marked on the outside of the package, and the shipper must make arrangements with the operator for each shipment. [1] The section does not set rules for road-only parcels, so ask how your parcel will travel.

Air shipments of small packages get a simpler route. A package containing no more than 2.5 kg (5.5 pounds) of dry ice used to refrigerate its contents is excepted from all other requirements if it vents properly and is marked 'Carbon dioxide, solid' or 'Dry ice', with the name of the contents being cooled and the net weight of dry ice or an indication that it is 2.5 kg or less. [1] Where shipping papers are replaced by alternative written documentation for an air shipment, it must show the shipping name, class 9, UN number 1845, the number of packages and the net quantity of dry ice per package. [1]

Air shipments are also governed by the IATA Dangerous Goods Regulations, which IATA describes as the global reference for shipping dangerous goods by air. [8] Carriers apply their own acceptance rules on top; ask the supplier which carrier and service it uses if you expect dry ice.

• Marking 'Dry ice' or 'Carbon dioxide, solid' on the outside (air small-package exception). [1]
• Net weight of dry ice in kg, or an indication of 2.5 kg or less for small packages (air). [1]
• Name of the contents being cooled (air small-package exception). [1]
• UN 1845 and class 9 on the alternative written documentation for air shipments. [1]
• A box that is not sealed airtight: carbon dioxide gas must be able to escape (air or water). [1]

What each listed supplier states about shipping method

We checked each supplier's shipping, FAQ and terms pages on the date shown. None states dry-ice or cold-pack shipping for lyophilized peptides.

Receiving: what to record for each mode

The receiving record should capture enough to answer one question later: how long, and roughly how warm, was this material in transit? Tracking timestamps answer the first part for any mode. For cold-pack and dry-ice parcels, the state of the refrigerant on arrival is the only evidence of the second part you will have unless a temperature logger is included.

• Dispatch and delivery timestamps from tracking; the difference is your transit time.
• Mode actually received (ambient, cold pack, dry ice), even if the order page said something else.
• For cold packs: frozen, partly thawed or fully thawed.
• For dry ice: still present or fully sublimated; the marking and net kg on the box. [1]
• Vial condition: intact seal, cake appearance, any moisture inside the vial.
• Photographs of the outer box, inner packaging and vials before anything is moved.
• Storage condition the vials went into, and the time.

When to ask for a different method

Ask before ordering, not after a delayed parcel. If your destination routinely sees long customs holds, or summer transit through hot depots, ask the supplier whether it offers any temperature-controlled option and what stability data supports ambient shipping for that sequence. Peptides EU notes that third-country imports typically pass through customs clearance, which it says routinely adds one to three weeks. [3] That is well beyond the transit times in the table above, and it is exactly the kind of excursion ICH Q1A suggests should be covered by data rather than assumption. [4]