You land, it's bedtime at your destination, and your body insists it's mid-afternoon. Jet lag is one of the situations where melatonin has the strongest research behind it, but only if you time it well. Here's how to plan it around your trip.
Written by Vita Globe Editorial Team | Reviewed against CDC travel guidance, AASM practice parameters and a Cochrane review
Does melatonin help jet lag, and when should you take it?
Yes, for many travelers. A Cochrane review of 10 trials found melatonin taken close to the target bedtime at your destination (10 p.m. to midnight) reduced jet lag after flights crossing five or more time zones[1]. The American Academy of Sleep Medicine says appropriately timed melatonin reduces jet lag symptoms and improves sleep after travel across multiple time zones[3]. CDC guidance notes 0.5–1mg is often enough to shift the body clock[2].
Caveat: The strongest evidence is for eastward trips across many time zones; short hops may not need it.
Sources: Cochrane 2002 · CDC Yellow Book · AASM · Verified 2026-09-27
In this article
Why does jet lag happen?
Your body runs on an internal clock that's set mostly by light. When you fly across time zones, the local clock changes instantly, but your internal clock shifts slowly. Until they line up, you may struggle to sleep at night, feel foggy during the day and notice changes in appetite and digestion.
Flying east is usually harder, because you're asking your body to go to sleep earlier than it wants to. Melatonin, the hormone your brain releases as evening approaches, is a natural fit here: taken at the right time, it helps signal "night" to your internal clock on the new schedule[2].
What does the research say about melatonin for jet lag?
Jet lag is one of the better-supported uses for melatonin:
- A Cochrane systematic review of 10 placebo-controlled trials concluded melatonin is remarkably effective in preventing or reducing jet lag, and that occasional short-term use appears to be safe. The authors suggested it for adult travelers crossing five or more time zones, particularly flying east[1].
- In that review, doses between 0.5mg and 5mg were similarly effective, though people fell asleep faster and slept better on 5mg than 0.5mg[1].
- AASM practice parameters state that melatonin administered at the appropriate time reduces jet lag symptoms and improves sleep after travel across multiple time zones[3].
- The NIH notes that studies suggest melatonin may be better than placebo at reducing overall jet lag symptoms after eastward flights[4].
CDC travel guidance adds that 0.5–1mg is often enough to shift the body clock, and cautions against high doses above 5mg[2].
How should you time melatonin when flying east?
Flying east (for example, New York to London) means you need to fall asleep earlier by your body's clock. The CDC's guidance is to take melatonin before bedtime at your destination, so it adds to the natural evening rise in melatonin and helps you sleep earlier[2]. The Cochrane review found benefit when melatonin was taken close to the target local bedtime, 10 p.m. to midnight[1].
A simple plan many travelers use:
- On arrival night, take melatonin close to your target local bedtime.
- Repeat for the next few nights while you adjust.
- Get outdoor light at the times your body clock needs it; a jet lag calculator can help you plan this[2].
What about flying west?
Flying west (for example, New York to Los Angeles) means staying up later than your body wants, which most people find easier. The research for melatonin is strongest for eastward trips[1][4]. The CDC chapter describes a different timing strategy for westward travel, aimed at shifting your body clock later rather than earlier[2]. Because the right timing depends on your route and schedule, it's worth using a jet lag planner or asking a travel medicine clinician. For many westward trips, evening light and a normal local bedtime may be enough.
What else helps you adjust faster?
- Use light strategically. Morning light helps you shift earlier; evening light helps you shift later[2].
- Go easy on alcohol. It can dehydrate you and fragment sleep, even if it makes you drowsy at first[2]. Here's why melatonin and alcohol don't mix.
- Time your caffeine. CDC guidance suggests avoiding caffeine within about six hours of your intended bedtime[2].
- Don't drive right after taking melatonin. Mayo Clinic advises waiting five hours before driving[5], which matters if you're picking up a rental car.
- Skip melatonin if you take blood thinners or have epilepsy unless your doctor okays it[1][4].
For more on getting the timing right at home, see how long before bed to take melatonin.
The honest summary
- Melatonin has good evidence for reducing jet lag, especially on eastward flights across five or more time zones[1][3].
- Timing matters more than dose: take it close to your target bedtime at your destination when flying east[1][2].
- Low doses are often enough, and CDC guidance cautions against going above 5mg[2].
- Pair it with smart light exposure and go easy on alcohol.
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Frequently asked questions
Should I take melatonin on the plane?
Only if it lines up with bedtime at your destination. Taking it at the wrong time can shift your clock the wrong way or leave you groggy on arrival[2].
How many days should I take melatonin for jet lag?
Think of it as a short-term tool for the first few nights while you adjust, and stop once you're sleeping on local time. The Cochrane authors described occasional short-term use as appearing safe[1].
What dose of melatonin is best for jet lag?
Doses from 0.5mg to 5mg worked similarly in the Cochrane review[1], and CDC guidance says 0.5–1mg is often sufficient[2]. Ask your clinician what's right for you.
Does melatonin help with short time changes, like 2–3 hours?
The research is strongest for five or more time zones[1]. For small changes, light exposure and a consistent schedule may be all you need.
Sources
- Herxheimer A, Petrie KJ. Melatonin for the prevention and treatment of jet lag. Cochrane Database Syst Rev. 2002;(2):CD001520. doi:10.1002/14651858.CD001520
- Riedy SM, Williams SG. Jet lag disorder. In: CDC Yellow Book: Health Information for International Travel, 2026 edition. Centers for Disease Control and Prevention. cdc.gov
- Morgenthaler TI, Lee-Chiong T, Alessi C, et al. Practice parameters for the clinical evaluation and treatment of circadian rhythm sleep disorders. Sleep. 2007;30(11):1445–1459. doi:10.1093/sleep/30.11.1445
- National Center for Complementary and Integrative Health (NIH). Melatonin: What You Need To Know. Updated May 2024. nccih.nih.gov
- Mayo Clinic Staff. Melatonin side effects: What are the risks? Mayo Clinic. Updated December 2025. mayoclinic.org
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
