Travelling with peptides? "Research use only" won't get BPC-157 through customs

Peptides such as BPC-157, TB-500 and melanotan II are easy to buy online, often as small vials marked "research use only". At the border, that label doesn't protect you, and in most of the countries below the vials themselves are the problem.

The short version: an unapproved peptide is treated as an unapproved medicine, not as a supplement or a lab chemical. Growth hormone and HCG prescribed to you are a separate case, with clearer rules.

"Research use only" doesn't count

All three regulators we checked say the label makes no legal difference:

• United States. In a March 2026 warning letter to a peptide seller, the FDA said that, despite "Research Use Only" labels, the products were drugs intended for human use.
• Canada. Health Canada says this kind of labelling "does not make these products legal or exempt from regulatory requirements."
• New Zealand. Medsafe says the wording "has no legal effect."

Country by country

United States: not allowed. BPC-157, TB-500, melanotan II and similar peptides are not FDA-approved. The FDA's rule is that importing an unapproved drug is illegal, even for personal use and even if another country allows it. The FDA may let a small personal supply through in narrow cases, such as a serious condition with no treatment available in the US. That is a choice the FDA makes, not something you can count on, and the FDA lists safety concerns for most of these peptides.

Canada: not allowed. Health Canada says peptides are generally regulated as prescription drugs, and unauthorized drug products are illegal. Its April 2026 advisory names BPC-157, TB-500, CJC-1295, ipamorelin, GHK-Cu, melanotan and retatrutide among products it has seized. It also works with border officers to stop unauthorized shipments. An authorized drug has an eight-digit DIN on its label. Research vials don't.

New Zealand: only with a prescription. Medsafe says many peptides are prescription medicines, and it's unlawful to import or possess them without authorisation. If a doctor has prescribed one to you, the normal traveller rule applies:

• no more than 3 months' supply,
• a copy of the prescription or a letter from your doctor,
• the original containers,
• and declare it on your arrival card.

Having peptides posted to you in New Zealand is stricter: you need a prescription from a New Zealand prescriber.

United Kingdom: growth hormone and HCG, carried in person. UK law lists growth hormone (somatropin) and HCG as controlled drugs, but it allows you to bring them in person, for your own use. Keep them in your hand luggage, bring no more than 3 months' supply, and if you don't live in the UK, carry a letter signed by your prescriber. Having them posted to you isn't covered, and gov.uk says posted medicine will be taken away. We haven't verified a UK rule on BPC-157 or other research peptides yet.

Australia: only with a prescription. Australia's Poisons Standard names BPC-157, TB-500, ipamorelin, CJC-1295, GHRP-6, AOD-9604, ibutamoren and melanotan II as prescription-only medicines, and most of them are also on its list of medicines that are illegal to possess without authority. Australian law only lets a traveller bring in a prescription-only medicine with written authority from a doctor, such as a prescription. A doctor in your home country counts. Then the usual limits apply: no more than 3 months' supply, in packaging that identifies it, and declare it. Growth hormone and HCG follow the same pattern: prescribed to you, carried in your accompanied baggage, up to 3 months' supply. Athletes, and support staff travelling with them, need a permit from the Office of Drug Control for hormones and peptides even with a prescription.

What this means for your trip

If your peptide came from a "research" website, plan on not packing it for the US, Canada, New Zealand or Australia. If a doctor prescribed it, bring the prescription and stay within the supply limit.

Ozempic, Wegovy and Mounjaro are peptides too, but they're approved medicines with their own, easier rules. See flying with Ozempic, Wegovy or Mounjaro.

Check a specific peptide: BPC-157, TB-500, melanotan II, or all peptides.