Melatonin

Can I take Melatonin across a border? Yes in many places, with conditions. Of the 25 country-rules we've indexed for Melatonin, 9 are allowed (often with limits), 16 are restricted (permit, declaration, or quantity cap), and 0 are prohibited outright. Customs rules depend on the destination, the purpose (travelling, posting, importing personally, or importing commercially), and the quantity.

Melatonin is a hormone produced naturally by the pineal gland that regulates the sleep-wake cycle. It is widely sold as an over-the-counter dietary supplement in North America for jet lag and insomnia, typically in doses of 0.5 mg to 10 mg. It is also available in extended-release prescription formulations in some markets. In the United States and Canada, melatonin is classified as a dietary supplement, meaning it sits outside pharmaceutical regulation and can be sold freely in pharmacies, supermarkets, and online. However, in the European Union, Australia, the United Kingdom, and several other markets, melatonin is classified as a medicine — a prescription drug — because it is a hormone affecting physiological function. This regulatory divergence creates confusion for travelers who routinely carry a bottle of melatonin from North America to Europe or Asia without realizing that the same product is prescription-only in the destination country. At low doses for occasional personal use, most countries exercise discretion and do not actively pursue enforcement against individual travelers carrying melatonin. However, commercial quantities or high-dose products are more likely to attract scrutiny. Japan is particularly notable: melatonin supplements are not approved in Japan and are classified as unapproved drugs; importing them, even for personal use, is technically a violation. Travelers should carry a small, clearly personal-use quantity in original packaging and be prepared to explain its medical purpose.

Common mistakes with Melatonin

• Assuming the rules at the origin apply at the destination — they don't. The destination customs authority is the binding rule.
• Travelling and posting are treated differently: an item you can carry may be prohibited by post (and vice versa).
• Personal vs commercial intent: above a quantity threshold, customs may treat your shipment as commercial regardless of intent.
• Undervaluing on the customs declaration to avoid duty — treated as fraud in most jurisdictions.
• Vague item descriptions on CN22/CN23 — biggest single cause of postal customs holds.
• Carrying medication in unmarked containers, without the original prescription, or above 30-90 days' supply.
• Missing required certificates (phytosanitary, veterinary, CITES, prescription, product compliance).

Always verify against the destination's customs authority before acting. Not legal advice.

HS codes

• 2106.90 — Other food preparations not elsewhere specified or included (where melatonin is regulated as a supplement)
• 3004.90 — Other medicaments (where melatonin is regulated as a medicine, e.g. EU/UK)

Regulatory trend

Classification varies by jurisdiction (supplement in US; medicine in EU/UK/Japan) and has been stable for the last decade.

General notes

Also documented for posting & importing