Evidence-Based Jet Lag Recovery Strategies
Last reviewed: March 21, 2026, 7:02 a.m.
Jet lag is the temporary circadian disruption that occurs when rapid travel across time zones creates a mismatch between the body's internal clock and the local time at the destination. The severity is proportional to the number of time zones crossed, with most people experiencing noticeable symptoms after crossing three or more zones. Eastward travel is generally harder to adapt to than westward travel because advancing the circadian clock is more physiologically demanding than delaying it. Full adaptation typically requires about one day per time zone crossed, but strategic use of light exposure, melatonin, and supporting supplements can significantly accelerate this process.
Melatonin is the most evidence-supported supplement for jet lag, and the Cochrane Collaboration has rated the evidence as strong, with a number needed to treat (NNT) of 2 for eastward travel across 5 or more time zones, meaning that every other person who takes melatonin experiences meaningful benefit. The timing protocol depends on travel direction. For eastward travel, take 0.5 to 3 mg of melatonin at the destination bedtime on the day of arrival and for 3 to 5 nights afterward. This helps advance the circadian clock to match the earlier time zone. For westward travel, the strategy is less straightforward. Some researchers recommend taking a small dose (0.5 mg) in the second half of the destination night if you wake prematurely, though the evidence for westward jet lag is weaker. Higher doses of melatonin (5 mg and above) have not been shown to be more effective than lower doses for jet lag and may cause unwanted grogginess.
Light exposure is the most powerful non-supplement tool for jet lag recovery and should be used in conjunction with melatonin for optimal results. For eastward travel, seek bright light in the morning at your destination and avoid bright light in the evening. For westward travel, do the opposite: seek evening light and allow yourself to sleep later in the morning during the adaptation period. A 2003 review by Waterhouse et al. demonstrated that combining timed light exposure with appropriately timed melatonin produced faster circadian adaptation than either intervention alone. If morning light is not available at your destination (winter travel, for example), a 10,000 lux light therapy box for 30 minutes upon waking can substitute for natural sunlight.
Supporting supplements can complement the melatonin and light strategy. Magnesium glycinate (200 to 400 mg) taken at destination bedtime may support sleep quality during the adaptation period, when you need to sleep at times your body considers daytime. L-theanine (200 mg) can help quiet the alerting signals that the circadian system sends at inappropriate times, facilitating sleep when your body is not naturally ready. Tart cherry juice, which contains small amounts of natural melatonin and anti-inflammatory proanthocyanidins, has been studied as a food-based approach to jet lag recovery with modest positive results. Vitamin D supplementation during travel to destinations with limited sunlight may also be worth considering, as disrupted sun exposure patterns during travel can exacerbate existing deficiency.
Beyond supplements, several behavioral strategies are important for jet lag management. Begin adjusting your sleep schedule 2 to 3 days before travel by shifting bedtime and wake time 30 to 60 minutes per day toward your destination time. Stay well-hydrated during flight, as cabin air humidity of 10-20% promotes dehydration that can worsen fatigue. Avoid alcohol during the flight, as it disrupts sleep architecture and worsens dehydration. Upon arrival, align meal times with local schedules, as the digestive system has its own peripheral circadian clocks that influence overall adaptation. If you travel frequently across time zones for work, developing a consistent pre-and post-travel protocol that combines these strategies can meaningfully reduce the cumulative effects of repeated circadian disruption.
Melatonin is the most evidence-supported supplement for jet lag, and the Cochrane Collaboration has rated the evidence as strong, with a number needed to treat (NNT) of 2 for eastward travel across 5 or more time zones, meaning that every other person who takes melatonin experiences meaningful benefit. The timing protocol depends on travel direction. For eastward travel, take 0.5 to 3 mg of melatonin at the destination bedtime on the day of arrival and for 3 to 5 nights afterward. This helps advance the circadian clock to match the earlier time zone. For westward travel, the strategy is less straightforward. Some researchers recommend taking a small dose (0.5 mg) in the second half of the destination night if you wake prematurely, though the evidence for westward jet lag is weaker. Higher doses of melatonin (5 mg and above) have not been shown to be more effective than lower doses for jet lag and may cause unwanted grogginess.
Light exposure is the most powerful non-supplement tool for jet lag recovery and should be used in conjunction with melatonin for optimal results. For eastward travel, seek bright light in the morning at your destination and avoid bright light in the evening. For westward travel, do the opposite: seek evening light and allow yourself to sleep later in the morning during the adaptation period. A 2003 review by Waterhouse et al. demonstrated that combining timed light exposure with appropriately timed melatonin produced faster circadian adaptation than either intervention alone. If morning light is not available at your destination (winter travel, for example), a 10,000 lux light therapy box for 30 minutes upon waking can substitute for natural sunlight.
Supporting supplements can complement the melatonin and light strategy. Magnesium glycinate (200 to 400 mg) taken at destination bedtime may support sleep quality during the adaptation period, when you need to sleep at times your body considers daytime. L-theanine (200 mg) can help quiet the alerting signals that the circadian system sends at inappropriate times, facilitating sleep when your body is not naturally ready. Tart cherry juice, which contains small amounts of natural melatonin and anti-inflammatory proanthocyanidins, has been studied as a food-based approach to jet lag recovery with modest positive results. Vitamin D supplementation during travel to destinations with limited sunlight may also be worth considering, as disrupted sun exposure patterns during travel can exacerbate existing deficiency.
Beyond supplements, several behavioral strategies are important for jet lag management. Begin adjusting your sleep schedule 2 to 3 days before travel by shifting bedtime and wake time 30 to 60 minutes per day toward your destination time. Stay well-hydrated during flight, as cabin air humidity of 10-20% promotes dehydration that can worsen fatigue. Avoid alcohol during the flight, as it disrupts sleep architecture and worsens dehydration. Upon arrival, align meal times with local schedules, as the digestive system has its own peripheral circadian clocks that influence overall adaptation. If you travel frequently across time zones for work, developing a consistent pre-and post-travel protocol that combines these strategies can meaningfully reduce the cumulative effects of repeated circadian disruption.