What volume figure does EU law attach to medical liquids?

None in the Annex. Point 4.1.2.2 names “LAGs to be used during the trip for medical purposes or a special dietary requirement, including baby food” as a category that is still screened. A 17 September 2026 search of that Annex for “medicine” and “medicinal product” returned 0 hits. AESA restates medicines, baby food and special dietary products which exceed 100 ml for departures from the EU, Norway, Iceland and Switzerland; that restatement is written around medicinal products and says nothing about how a research-use vial would be classified.

What does German customs treat as usual personal need?

Zoll describes “ein Bedarf für maximal drei Monate je Arzneimittel.” Authorisation status in Germany does not change that ceiling: “unerheblich, ob die Arzneimittel in Deutschland zugelassen bzw. registriert sind.” The same page states that products can be medicines “unabhängig von ihrer Darbietung, allein aufgrund ihrer objektiven Eigenschaft Arzneimittel sind.” Those sentences are written around medicinal products and do not classify a research-use vial.

What does Swedish customs say about a product classed as a medicine abroad?

Tullverket’s Buying medicines online page, updated 22 April 2026, states that a product “classed as a medicine in Sweden is subject to Swedish law, regardless of whether or not it is classed as a medicine in another country.” Travelling with medicines, updated 15 April 2026, sets three months consumption for a non-EEA origin and one year for an EEA origin, and requires proof that the goods “are being imported for personal use.” The same buying-online page states that a person “may not receive medicines sent to you from a country outside the European Economic Area (EEA).”

What did the teriparatide study report after reconstitution?

Merutka et al. 2016 reported that PTH(1-34) stability after reconstitution “varied considerably, depending on peptide concentration and storage temperature,” with precipitation within 2 to 4 weeks in some samples, and that “the combined stresses of freezing and drying” increased aggregation (PMID 26620825). Never-lyophilized liquid samples of the same peptide “did not display any precipitation upon storage in the liquid state for as long as twelve weeks.” The study is a laboratory stability paper, not a cabin-temperature travel study.

What rules apply to peptide vials in carry-on luggage?

Q: How does EU law define liquids, aerosols and gels?

Regulation (EU) 2015/1998 Annex point 4.0.4(a) defines them by consistency as “pastes, lotions, liquid/solid mixtures and the contents of pressurised containers.” Point 4.1.2.2 requires that “LAGs shall be removed from cabin baggage and shall be screened separately.” Containers “with a capacity not greater than 100 millilitres” “may be exempted from screening with LEDS equipment upon entry to the SRA” (4.1.3.1(a)), which is a screening exemption, not a carriage permission.

Research use only. This page is scientific background and community-report context on published screening law, national customs medicines rules and stability studies. Every compound sold here is supplied strictly for in-vitro research. Nothing on the page is a protocol, a recommendation or medical advice.

It reports published rules and published measurements only: no advice on concealing, relabelling, repackaging, splitting or misdeclaring goods, and no presentation of catalogue products as a traveller's own supply. It names no tolerance threshold, no claim about what an authority checks in practice, and no conclusion about any traveller's legal position.

TL;DR: cabin screening, national customs, unchilled solutions

Research question: What published aviation security rules, customs rules and stability studies state about peptide vials in cabin baggage and about an unchilled solution. What the published data say: Regulation (EU) 2015/1998 treats containers not greater than 100 millilitres as a screening exemption, not a carriage permission (Annex 4.1.3.1(a)). German Zoll and Swedish Tullverket set national medicines rules that differ. Insulin and PTH(1-34) papers report named warm-hold windows (PMID 37930742, PMID 26620825). What the documented searches found: PubMed searches on 17 September 2026 for peptide vial air travel stability, reconstituted peptide travel temperature excursion and insulin air travel cabin temperature stability each returned 0 hits. What research communities report: in the Reddit corpus we track, 403 question posts in 12 months matched the travel-and-vial search covering both merged questions, cabin baggage and an unchilled solution, 3 of them in the 13 to 17 September 2026 window. Reports, not evidence of frequency or legality.

What does EU cabin baggage law regulate?

Regulation (EU) 2015/1998 regulates screening by physical form, not by a research-chemical class. Point 4.0.4(a) defines liquids, aerosols and gels as “pastes, lotions, liquid/solid mixtures and the contents of pressurised containers,” and point 4.1.2.2 states that “LAGs shall be removed from cabin baggage and shall be screened separately.” Under point 4.1.3.1(a), containers “with a capacity not greater than 100 millilitres” “may be exempted from screening with LEDS equipment upon entry to the SRA,” an exemption from screening, not a carriage permission.

Searches of that Annex and of Regulation (EU) 952/2013 on 17 September 2026 for research chemical returned 0 hits in each text. Searches of the Annex, including Attachment 4-C, for hypodermic, syringe and needle each returned 0 hits, so the prohibited-articles list names none of those three items. That describes the list's wording, not the classification of any catalogue vial.

What do the liquid rules say about medical liquids?

The Annex names medical liquids only as a category that is still screened, and attaches no volume figure to them. Point 4.1.2.2 refers to “LAGs to be used during the trip for medical purposes or a special dietary requirement, including baby food.” A search of the Annex for medicine and medicinal product the same day returned 0 hits: the text says “medical purposes” only.

AESA (Spain) names an exception above that volume for “Medicines, baby food and special dietary products, which exceed 100 ml,” for passengers “departing from airports in the European Union, Norway, Iceland and Switzerland, regardless of their destination.” That exception is written around medicinal products and says nothing about how a research-use vial would be classified.

What do national customs rules require?

The customs texts quoted here are national medicines rules, and their provisions differ.

German Zoll, under Arzneimittel und Betäubungsmittel, describes usual personal need as “ein Bedarf für maximal drei Monate je Arzneimittel.” The same page states that products “unabhängig von ihrer Darbietung, allein aufgrund ihrer objektiven Eigenschaft Arzneimittel sind,” and names substances “die in der Anlage zum Anti-Doping-Gesetz (z.B. Testosteron, Nandrolon, Clenbuterol) aufgelistet sind.” Those three names are the authority’s own examples.

Swedish Tullverket, Travelling with medicines, updated 15 April 2026, states “If you are from a non-EEA country, the limit is three months consumption,” and sets a one-year ceiling when the origin is the EEA. Buying medicines online, updated 22 April 2026, states that a product “classed as a medicine in Sweden is subject to Swedish law, regardless of whether or not it is classed as a medicine in another country.”

Both authorities write around medicinal products. Neither says how a research-use vial would be classified.

What do stability studies report about a vial held warm?

The cited stability publications concern human insulin and PTH(1-34) (PMID 37930742; PMID 26620825). The three PubMed searches of 17 September 2026 named above each returned 0 hits, so no located study measured a research vial in transit. PeptidesDirect does not sell teriparatide. PeptidesDirect does not sell insulin.

Merutka et al. 2016 reported that PTH(1-34) stability after reconstitution “varied considerably, depending on peptide concentration and storage temperature,” with precipitation within 2 to 4 weeks in some samples, and named “the combined stresses of freezing and drying, leading to greater propensity to aggregate” (PMID 26620825). Never-lyophilized samples of the same peptide, held as liquid, showed no precipitation for as long as twelve weeks. Richter et al. 2023 reviewed unopened short-acting and intermediate-acting human insulin (PMID 37930742).

Hold, unopened human insulin	Readout	Source
Up to 25 °C	Maximum six months without a clinically relevant loss of insulin potency	PMID 37930742
Up to 37 °C	Maximum two months without a clinically relevant loss of insulin potency	PMID 37930742
Oscillating 25 to 37 °C	Up to three months, no loss of insulin activity	PMID 37930742
37 °C for 1, 2 and 3 months (Novo Nordisk short-acting insulin data)	Activity losses of 2.2% to 2.8%, 5.7%, and 8.3% to 8.6%, respectively	PMID 37930742

Up to 25 °C

Readout: Maximum six months without a clinically relevant loss of insulin potency
Source: PMID 37930742

Up to 37 °C

Readout: Maximum two months without a clinically relevant loss of insulin potency
Source: PMID 37930742

Oscillating 25 to 37 °C

Readout: Up to three months, no loss of insulin activity
Source: PMID 37930742

37 °C for 1, 2 and 3 months (Novo Nordisk short-acting insulin data)

Readout: Activity losses of 2.2% to 2.8%, 5.7%, and 8.3% to 8.6%, respectively
Source: PMID 37930742

The Wegovy product information, section 6.3, describes unrefrigerated storage not above 30 °C for up to 28 days (EMA EPAR), and the Bacteriostatic Water for Injection USP label describes storage at 20 to 25 °C without a period for a dissolved drug (DailyMed, rev. 08/2019). PeptidesDirect does not sell Wegovy. A certificate of analysis tests a powder batch at its test date, not a vial after a journey. Laboratory background: peptide storage and a reconstituted vial left out of the fridge.

Products mentioned

Rigid cases and boxes for keeping sealed vials sorted appear in the accessories catalogue. They are laboratory storage articles, not a travel protocol.

Peptide Vial Case 30 Slotsaccessories

Hard zippered EVA case with 30 foam slots that keeps standard 1-3 ml peptide vials organized and protected for fridge storage or travel.

Peptide Storage Box (10 Compartments)accessories

Transparent storage box with 10 individual compartments for 1-3 ml peptide vials. Stackable, fridge-friendly, travel-safe. Ideal for organising bacteriostatic water, GLP-1, BPC-157, and similar vials.

Sources

European Commission. Commission Implementing Regulation (EU) 2015/1998, Annex, points 4.0.4(a), 4.1.2.2, 4.1.3.1(a), Attachment 4-C.
AESA (Spain). Security, Passengers. Medicines, baby food and special dietary products; departures from EU, Norway, Iceland and Switzerland.
Zoll (Germany). Arzneimittel und Betäubungsmittel.
Tullverket (Sweden). Travelling with medicines. Updated 2026-04-15.
Tullverket (Sweden). Buying medicines online. Updated 2026-04-22.
European Union. Regulation (EU) 952/2013, Union Customs Code (text searched for research chemical).
Merutka G et al. 2016. Eur J Pharm Biopharm. PMID 26620825.
Richter B et al. 2023. Cochrane Database Syst Rev. PMID 37930742.
EMA. Wegovy EPAR product information s.6.3.
DailyMed. Bacteriostatic Water for Injection USP, HOW SUPPLIED and PRECAUTIONS, rev. 08/2019. setid 87d6e9dc-fe3b-4593-ac9a-d7493d1959c7.

Research use only. Catalogue peptides and accessories are supplied for laboratory research, not for human or animal administration and not as medicines. Nothing in this article is a packing, customs, dosing, or medical instruction.