Melatonin in the United States: OTC Access, Brands and Travel Rules

Melatonin is widely available without a prescription across the United States. Here is what to know before you travel.

Quick reference

Drug class: Hormone / sleep aid
Controlled substance: No, not scheduled under any US federal controlled-substance schedule
Prescription required: No, sold over the counter in the United States
Available locally: Yes, widely available OTC in pharmacies, supermarkets, and health stores; no single dominant brand in US retail; sold under the generic name and numerous store brands
Storage: Room temperature (below 25°C / 77°F), away from direct light and humidity
Max supply to carry: No legal quantity limit for personal use; carry what you need for your trip
Key document: No import permit or doctor's letter required; keep original packaging if carrying large quantities through other jurisdictions on a multi-leg journey
Emergency alternative: Melatonin is sold without a prescription at any major US pharmacy chain (CVS, Walgreens, Rite Aid) or supermarket; replacement is straightforward if your supply is lost.

Travelling to the United States with melatonin: what you need to know

Melatonin, sold internationally as Circadin and Slenyto (prescription-only formulations in several European countries) and as Melatobel in Japan, is available without a prescription across the United States^[1], typically sold under the generic name or store-brand labels at pharmacies and supermarkets.

The key travel consideration is not US import rules, which are minimal, but the rules of any transit country you pass through, particularly if you carry the prescription formulations Circadin or Slenyto from a country where melatonin requires a prescription.

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.

Before you travel

Documentation for travelling to the United States with melatonin

Melatonin is not a controlled substance under US federal law and does not require an import permit or a doctor's letter^[2] to bring into the United States. If your melatonin was prescribed in another country in a prescription formulation such as Circadin or Slenyto, carrying the original packaging with the pharmacy label is good practice and satisfies most customs queries.

Pre-travel paperwork timeline

T-30 days
Confirm your melatonin supply is adequate for the full trip. If you use a prescription formulation (Circadin, Slenyto) from your home country, request a repeat prescription to cover the journey plus a buffer.Repeat prescription
T-14 days
No US import permit is required. If you have a layover in a country where melatonin requires a prescription, such as several EU member states, check that country's rules and obtain a doctor's letter if needed for the transit leg.Transit-country letter (if applicable)
Processing time varies by country. Check with your home prescriber at least two weeks before travel.
T-7 days
Ensure all melatonin is in original, labelled packaging. No translation is required for entry into the United States. If carrying a large quantity, note the dosage and quantity on a signed personal note as a precaution.Original pharmacy packaging
T-1 day
Pack melatonin in hand luggage to avoid temperature extremes in the hold. Keep it accessible but you are not required to declare it at US customs.
T-0 (border)
No proactive declaration is required for melatonin entering the United States. If a CBP officer asks about medications, state the generic name and show the original packaging.

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What your doctor's letter should include (if you need one for a transit country)

Full name, medication name (INN: melatonin, and brand name), dose and frequency, quantity carried, condition name, doctor's signature and registration number, and clinic letterhead. Check whether the transit country requires translation into its official language.

No translation, notarisation, or apostille is required for melatonin entering the United States directly. If your journey involves a transit stop in a country where melatonin is regulated as a prescription medicine, prepare documentation for that leg of the trip separately.

How much melatonin to bring

There is no legal quantity limit on melatonin for personal import^[3] into the United States. Because melatonin is sold OTC throughout the country, replacement is easy if your supply runs low. Bringing a modest buffer above your expected needs is still sensible, particularly if you rely on a specific dosage or extended-release formulation not available in US stores. Travel insurance rarely covers the cost of OTC supplements, so keep receipts if you buy locally.

Split your supply

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

Packing and storing melatonin for travel

Standard melatonin tablets and capsules should be stored at room temperature, below 25°C (77°F), away from direct light and moisture. Keep tablets in a sealed container and avoid leaving them in a hot car or direct sunlight during transit. No refrigeration is needed for standard formulations. The extended-release Circadin formulation follows the same room-temperature storage requirement.

At the airport and border

Airport security with melatonin

The TSA permits passengers to carry solid medication (tablets, capsules) in carry-on or checked bags with no quantity limit and no requirement to separate medication at the security checkpoint. Liquid melatonin over 100 ml must be declared separately at the checkpoint and is subject to additional screening, but it is permitted. You are not required to keep medication in original packaging for TSA purposes, though doing so speeds up any queries.

Customs and medication import rules for the United States

US Customs and Border Protection (CBP) does not require you to declare melatonin, and no import permit is needed for personal-use quantities of this supplement. Melatonin is classified as a dietary supplement under the Dietary Supplement Health and Education Act (DSHEA) and is regulated by the FDA accordingly, not as a controlled substance.^[4] If CBP officers ask about medications in your luggage, state the name and show original packaging; no further documentation is required.

Keep original packaging

Although melatonin is not a controlled substance in the United States, keeping it in its original labelled packaging removes any ambiguity at the border. This is especially relevant if you carry a prescription formulation such as Circadin, where the packaging clearly states the dose and active ingredient. If a CBP officer queries an unmarked bottle, original packaging resolves the question immediately.

While in country

Melatonin availability in the United States

Melatonin products sold in the United States

Indication	Formulation	Supply note
Sleep support	Immediate-release tablet / gummy / liquid (various doses 0.5 mg to 10 mg)	Widely available OTC at CVS, Walgreens, Rite Aid, Target, Walmart
Sleep support	Extended-release tablet (generic, various brands)	Available OTC at major pharmacy chains; supply reliable
Sleep support (children, specialist formulation)	Liquid / chewable low-dose	Available OTC and online; paediatric doses widely stocked

Melatonin is sold over the counter in the United States under the DSHEA framework, which classifies it as a dietary supplement rather than a drug. Major pharmacy chains including CVS, Walgreens, and Rite Aid stock multiple dosage strengths and formulations. Retail prices typically range from $5 to $20 (~€4.30 to ~€17) for a 60-tablet bottle, depending on the dose and brand. No prescription is required.

Finding a doctor who can prescribe melatonin in the United States

Because melatonin is available OTC throughout the United States, a doctor's visit is not needed to obtain it. If you require a specific prescription formulation for a documented clinical reason, a US-based GP or sleep specialist can issue a prescription; initial consultations at urgent-care clinics typically cost $75 to $200 (~€64 to ~€171) without insurance.

Telemedicine platforms operating in the United States, such as Teladoc and MDLive, can connect you with a licensed US clinician within hours if a formal assessment is needed. For more context on prescriber options, see our United States healthcare guide.

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Storing melatonin while in the United States

Store melatonin at room temperature away from humidity and direct sunlight. US summers can exceed 38°C (100°F) in desert states such as Arizona and Nevada; do not leave melatonin in a parked car. Hotel rooms with air conditioning provide adequate storage conditions in all but the most extreme climates. The FDA notes that dietary supplements should be stored according to label instructions^[5], which for standard melatonin tablets means below 25°C (77°F) and away from moisture.

Emergencies

What to do if something goes wrong with your melatonin in the United States

If your melatonin is lost, stolen, or damaged, walk to the nearest pharmacy and buy a replacement OTC. No prescription or documentation is needed. CVS, Walgreens, Rite Aid, and most Walmart or Target stores stock multiple strengths.

If you run out unexpectedly, replacement costs $5 to $20 (~€4.30 to ~€17) for a standard bottle and requires no clinical contact. If you use a specific prescription-grade extended-release formulation such as Circadin, which is not sold under that brand in the United States, ask a pharmacist for a comparable extended-release melatonin product and discuss the dosage match with your regular prescriber via a telemedicine call.

“Necesito melatonina. / Tengo un trastorno del sueño. / ¿Dónde está la farmacia más cercana? / Por favor llame a un médico.”

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

The emergency number across the United States is 911, which connects to ambulance, police, and fire services.^[6] For non-emergency medical queries, urgent-care clinics operate in most cities and towns, typically without an appointment.

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Frequently asked questions

Is melatonin legal in the United States?

Melatonin is legal and widely available without a prescription in the United States, where it is classified as a dietary supplement under the Dietary Supplement Health and Education Act (DSHEA). There are no quantity restrictions for personal use and no requirement for a doctor's letter.

Can I bring melatonin into the United States?

Yes. Melatonin is not a controlled substance under US federal law and does not require an import permit or customs declaration. Carry it in original packaging as a precaution, but no supporting paperwork is required by US Customs and Border Protection.

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

No doctor's letter is required to enter the United States with melatonin. If your journey involves a transit stop in a country where melatonin is prescription-only, such as Germany, Ireland, or Australia, you may need documentation for that transit leg. Check the rules for every country your itinerary passes through.

Is melatonin available over the counter in US pharmacies?

Melatonin is sold without a prescription at all major US pharmacy chains, including CVS, Walgreens, and Rite Aid, as well as at supermarkets and health stores. It is available in doses ranging from 0.5 mg to 10 mg in immediate-release and extended-release formats, and prices typically range from $5 to $20 (~€4.30 to ~€17) per bottle.

Is Circadin available in the United States?

Circadin, the prolonged-release melatonin formulation licensed in the United Kingdom, Ireland, Germany, France, Spain, Italy, Sweden, Norway, and Australia, is not sold under that brand name in the United States. Generic extended-release melatonin with equivalent dosing is widely available OTC in US pharmacies. Slenyto, a lower-dose paediatric formulation also sold in the UK, Ireland, Germany, Spain, and Italy, likewise has no US brand equivalent, but comparable low-dose formulations exist on US shelves.

What if I run out of melatonin in the United States?

Walk to the nearest pharmacy and buy melatonin OTC without a prescription. Replacement is available in all 50 states, typically within a few minutes of any urban or suburban location. If you rely on a specific extended-release dose not matched by local products, contact your regular prescriber by telemedicine to confirm the closest equivalent.

Does the FDA regulate melatonin as a drug in the United States?

No. The FDA regulates melatonin as a dietary supplement under DSHEA, not as a prescription drug. This means manufacturers do not need pre-market FDA approval, and the supplement can be sold OTC. It also means the FDA does not standardise doses across brands, so potency can vary between products.