Can You Bring Melatonin to Japan? Limits and Rules

Q: Can I bring melatonin into Japan?

Yes, up to one month's supply in original packaging, ideally with a doctor's letter. Supplements and gummies count as medicines in Japan, so the same limit applies, and you must not sell or give them away.

Q: How much melatonin can I bring to Japan?

Up to one month's supply without any paperwork, based on the dose on the label. For more, apply online for a Yunyu Kakunin-sho before you travel and carry the approval with you.

Quick reference

Drug class: Hormone / sleep aid
Controlled substance: No
Prescription required: Yes in Japan: Melatobel is a prescription-only medicine. Adult use would be off-label.
Available locally: Prescription only. Melatobel (Nobelpharma), approved in 2020 for sleep-onset difficulty in children with neurodevelopmental disorders. Not sold over the counter or as a supplement.
Storage: Room temperature (below 25°C), away from direct light and moisture
Max supply to carry: Up to one month's supply without paperwork. More than that needs a Yunyu Kakunin-sho (import confirmation) approved before you travel.
Key document: Doctor's letter or prescription. Add a Yunyu Kakunin-sho if you carry more than one month's supply.
Emergency alternative: A doctor in Japan is more likely to offer a registered alternative such as ramelteon (Rozerem) or suvorexant (Belsomra) than melatonin, which is licensed there only for children

Can you bring melatonin to Japan?

Yes, you can bring melatonin into Japan for your own use. It is not a controlled drug, but Japan classes it as a medicine rather than a supplement, so bring no more than one month's supply^[3], or apply for a Yunyu Kakunin-sho before you travel. You cannot buy it over the counter in Japan: the only approved product, Melatobel, is a prescription medicine for children with neurodevelopmental sleep problems^[1], so adults should bring their full supply, whether Circadin, Slenyto or a supplement brand.

Medical disclaimer: This guide is for informational purposes only and does not constitute medical advice. Always consult your prescribing doctor before travelling with medication, particularly regarding supply quantities, storage requirements, and import documentation.

Documentation for travelling to Japan with melatonin

Because melatonin is not sold over the counter in Japan, carrying a doctor's letter is strongly advisable. Japan Customs requires that personal-use medications be for the traveller's own use^[2], and a supporting letter from your prescribing doctor confirms this. Melatonin is not a controlled substance in Japan, so no narcotics or psychotropics permit is required, but the personal-import quantity limits below still apply.

Pre-travel paperwork timeline

T-30 days
Book an appointment with your prescribing doctor to obtain a doctor's letter covering the full duration of your trip plus a buffer. Request enough supply to cover your entire stay.Doctor's letter
T-14 days
Arrange a certified Japanese translation of your doctor's letter if possible. While not legally mandatory, a bilingual document reduces delays at customs. No import permit is required for melatonin in Japan.Translated letter
Translation services typically take 5-10 business days. Use a certified medical translator.
T-7 days
Confirm your supply count. Pack medication in original packaging with the pharmacy dispensing label clearly visible. Photograph your medication and documents and store copies in cloud storage.Original packaging with pharmacy label
T-1 day
Print all documents. Do not rely solely on phone storage in case of battery failure or device loss. Separate a backup supply into your checked luggage.
T-0 (border)
Keep your doctor's letter accessible in your carry-on. If a customs officer questions your medication, present the letter calmly. Declare your medication honestly on the customs form if prompted.

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What your doctor's letter must include

Full name matching your passport, medication name (INN: melatonin, and brand name if applicable), dose and frequency, quantity carried, the condition being treated (one word or short descriptor), doctor's signature and registration number, and clinic letterhead. A Japanese translation alongside the English version is advisable for smoother customs interactions.

Your doctor's letter does not need to be notarised or apostilled for melatonin entering Japan. A signed letter on clinic letterhead is sufficient.

How much melatonin to bring

Japan's health ministry allows up to one month's supply of a prescription medicine to be brought in without paperwork^[3]. Because the only melatonin product approved in Japan is prescription-only, plan on that one-month limit. If your trip is longer, apply online for a Yunyu Kakunin-sho (import confirmation) before you travel, and allow time for it to be approved. You cannot top up locally, so bring your whole permitted supply and check whether your travel insurer covers an emergency courier shipment.

Split your supply

Carry your main supply in hand luggage and a backup in your checked bag. If one bag is lost or delayed, you still have medication. Keep both portions in original packaging with pharmacy labels visible.

Packing and storing melatonin for travel

Melatonin tablets and capsules should be stored at room temperature, below 25°C, away from direct light and moisture. Standard blister or bottle packaging is sufficient for travel. During long-haul flights or layovers, keep the medication in your carry-on to avoid extreme temperature exposure in the hold. Japan's summer humidity (June to September) can be high, so avoid leaving tablets in a warm, damp bag, a sealed zip-lock inside your carry-on works well.

Airport security with melatonin

Melatonin tablets and capsules are not subject to liquids restrictions at airport security and can travel in your carry-on without declaration at the security checkpoint. Keep the medication in original packaging so that the label is visible if an officer asks. Security staff at airports in Japan and in most countries do not require you to remove oral solid medications from your bag for screening, but having your doctor's letter accessible avoids delays if questions arise.

Customs and medication import rules for Japan

Melatonin is not a controlled substance under Japan's Narcotics and Psychotropics Control Act or the Stimulants Control Act. Japan Customs allows personal-use quantities of medicine^[2] without prior approval, up to one month's supply for a prescription medicine; above that you need a Yunyu Kakunin-sho. Japan keeps melatonin on its list of ingredients that may only be sold as medicines^[7], so gummies and supplements count as medicine at the border too. Carry your doctor's letter and original packaging, and never sell or give your supply to anyone in Japan.

Keep your original packaging

Melatonin is approved in Japan only as a children's prescription medicine, so customs officers may not recognise your brand. Original pharmacy packaging with a dispensing label, combined with your doctor's letter, is your clearest evidence of legitimate personal use. Do not repack tablets into unmarked containers before your trip.

Melatonin availability in Japan

Melatonin products in Japan

Brand name	Indication	Formulation	Supply note
Melatobel	Approved 2020 for sleep-onset difficulty in children with neurodevelopmental disorders	Granules; 1 mg and 2 mg tablets since 2025	Prescription only, from hospital and pharmacy dispensaries; not sold over the counter
Circadin / Slenyto	Not registered in Japan	Prolonged-release tablet	Not available in Japan. Bring your supply from home, within the one-month limit or with a Yunyu Kakunin-sho.

Melatonin is approved in Japan only as Melatobel, a prescription medicine for children^[8], so it is not stocked on drugstore (kusuri-ya) or convenience store shelves and cannot legally be sold as a supplement. Some import shops in Tokyo may carry foreign health supplements, but product identity and dosage cannot be guaranteed. Do not rely on local sourcing; bring your permitted supply from home.

Finding a doctor who can help with sleep issues in Japan

Private hospitals in Tokyo, Osaka, and other major cities have sleep medicine departments and English-speaking physicians. Visitors without Japanese health insurance pay the full cost of a private outpatient consultation, and some hospitals add a surcharge, so ask for the price when you book. Melatonin is licensed in Japan only for children, so a doctor is more likely to suggest registered alternatives such as ramelteon (Rozerem) or suvorexant (Belsomra)^[4].

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Storing melatonin while in Japan

Store melatonin at room temperature below 25°C in a cool, dry place away from direct sunlight. Japan's summer months (June to September) bring high humidity and temperatures regularly above 30°C in Tokyo and Osaka. Keep tablets inside a sealed bag in an air-conditioned room, not on a windowsill or in a hot car. Hotel minibars or room refrigerators are acceptable for temporary storage but are not required.

What to do if something goes wrong with your melatonin in Japan

If your melatonin is lost or stolen, report the loss to the local police (dial 110) for a written record, which your travel insurer may require. Contact your insurer's emergency assistance line for guidance on reimbursement or emergency courier shipment of replacement medication from your home country.

If you run out of melatonin, you cannot buy a replacement over the counter in Japan. Visit a private hospital sleep medicine clinic and explain your situation. A doctor can offer registered alternatives such as ramelteon (Rozerem) or suvorexant (Belsomra), which are not controlled substances in Japan and can be prescribed on a short-term basis.

“私はメラトニンという薬を飲んでいます。 / 睡眠障害があります。 / 医師を呼んでください。 / 最寄りの薬局はどこですか？”

I take a medication called melatonin. / I have a sleep disorder. / Please call a doctor. / Where is the nearest pharmacy?

Japan's emergency number is 119 for ambulance and 110 for police. The Japan National Tourism Organization runs a 24-hour Japan Visitor Hotline on 050-3816-2787^[5] for help in English, Chinese and Korean with accidents and emergencies.

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Frequently asked questions

Is melatonin legal in Japan?

Yes. It is not controlled, but Japan classes it as a prescription medicine^[1], not a supplement. Visitors may bring up to one month's supply^[3] for personal use. Larger amounts need a Yunyu Kakunin-sho before travel.

Can I bring melatonin into Japan?

Yes, up to one month's supply^[3] in original packaging, ideally with a doctor's letter. Supplements and gummies count as medicines in Japan, so the same limit applies, and you must not sell or give them away.

How much melatonin can I bring to Japan?

Up to one month's supply^[3] without any paperwork, based on the dose on the label. For more, apply online for a Yunyu Kakunin-sho before you travel and carry the approval with you.

Does Japan classify melatonin as a controlled substance?

No. Melatonin is not listed under Japan's Narcotics and Psychotropics Control Act or the Stimulants Control Act, so no narcotics permit is needed. It is a regulated prescription medicine in Japan^[1], so personal-import quantity limits apply.

Do I need a doctor's letter to fly to Japan with melatonin?

A doctor's letter is not legally required for up to one month's supply, but it is advisable because customs officers may question an unfamiliar product. The letter confirms personal use and identifies the product clearly. For more than one month's supply you need a Yunyu Kakunin-sho, which asks for your prescription details.

What if I run out of melatonin while in Japan?

Melatonin is prescription-only in Japan and licensed only for children, so a doctor is more likely to offer an alternative such as ramelteon (Rozerem) or suvorexant (Belsomra)^[4]. Visit a private hospital sleep clinic and bring your packaging to show your usual dose.

Is melatonin sold in Japanese pharmacies?

Not over the counter. Melatobel is dispensed only on prescription^[1], mainly for children, and melatonin cannot be sold as a supplement in Japan. Bring your supply from home.

Is Circadin available in Japan?

No. Circadin, the prolonged-release melatonin brand licensed in Europe and Australia, is not registered or sold in Japan^[6]. Slenyto is likewise absent. Bring whichever brand you use at home, within the one-month personal-import limit or with a Yunyu Kakunin-sho.

Melatonin in Japan: Import Rules, Brands and Availability