While melatonin is available over the counter in many countries, it is classified as a prescription-only medication in Japan. This means that you cannot bring melatonin into Japan without a valid prescription from a licensed healthcare professional.
People Also Ask
Medicines that are hallucinogenic, narcotic, and/or psychotropic in nature will be confiscated, except in extenuating circumstances where prior approval has been obtained (e.g., a cancer patient taking a type of medication that has a high percentage of pain killer; these cases are treated on a case by case basis).
?Melatonin pills on a planeThere's no limit to how many melatonin pills you can bring on a plane. You might want to keep the pills somewhere easy to reach in case a TSA officer wants to take a closer look at a security checkpoint, but there's no TSA rules against bringing melatonin in pill form on a plane.
Take melatonin 20 to 30 minutes before sleep (for eastward travel, melatonin can also be taken en route, 30 minutes prior to the target bedtime at your destination. It doesn't need to be taken en route for westward travel). Take only the dose you need. A typical dose for melatonin ranges from 0.5mg to 5mg.