JET LAG
Jet lag remedies: an evidence-based review
The most effective jet lag remedies are correctly timed light and, for longer eastward trips, melatonin. Most other popular fixes either treat travel fatigue rather than jet lag itself, or have little evidence behind them. This review grades the common remedies by the strength of their evidence, explains why the right approach changes with the direction you fly, and covers where clinical recovery support fits.
On this page
What causes jet lag, and why it shapes the remedy
In brief
Jet lag is a mismatch between your body clock and destination time. Remedies that reset the clock to local time treat the cause; remedies that only relieve tiredness treat a symptom or treat travel fatigue instead.
Jet lag is a mismatch between your internal body clock and the time at your destination after crossing time zones. That single fact decides which remedies can work. Anything that helps reset the clock to local time treats the cause. Anything that only relieves tiredness treats a symptom, or treats the separate problem of travel fatigue. The clock is governed mainly by light, with meal timing and activity as secondary cues, as set out in our guide to how the circadian rhythm works. Effective remedies work with those cues; ineffective ones ignore them.
The remedies, graded by evidence
In brief
The strongest evidence sits with interventions that move the clock: timed light, and melatonin on larger eastward shifts. Several heavily marketed options (IV drips, vitamin C, homeopathy) do nothing to the misalignment that defines jet lag.
The table below grades the common remedies by how well the evidence supports them for jet lag specifically, separate from general tiredness. The strongest evidence sits with the interventions that move the clock.
| Remedy | Strength of evidence | How it works | Practical note |
|---|---|---|---|
| Timed light exposure | Strong | Shifts the master clock; light is the body’s most powerful timing cue | Time it to the destination morning or evening, by direction of travel |
| Melatonin | Strong (5+ time zones) | Signals biological night and nudges the clock earlier | Prescription-only in the UK; timing matters more than dose |
| Caffeine (timed) | Moderate | Improves daytime alertness; does not reset the clock | Use early in the destination day; avoid before local bedtime |
| Strategic short naps | Moderate | Relieve sleep pressure without erasing the coming night’s sleep | Keep them short and early in the day |
| Hydration | Moderate (for fatigue) | Counters cabin dehydration | Helps travel fatigue, not the circadian shift |
| Timed exercise | Limited / emerging | May reinforce light cues and daytime alertness | Daylight outdoor activity is the practical version |
| Meal timing | Limited / emerging | Helps reset the liver and gut clocks | Eat on destination time even without much appetite |
| “Jet lag” IV drips | Not supported for jet lag | Fluids and vitamins address dehydration, not timing | Treats fatigue; no effect on circadian misalignment |
| Vitamin C, supplemental oxygen, homeopathic pills | Not supported | No credible mechanism for shifting the clock | Best avoided as a jet lag strategy |
Two points stand out. First, the interventions that work are the ones that move the clock, and they are cheap. Second, several of the most heavily marketed options sit in the bottom rows: they may make you feel briefly better by addressing dehydration or fatigue, but they do nothing to the misalignment that defines jet lag. The standard advice, light, melatonin where appropriate, sensible caffeine and hydration, is well founded and should not be dismissed; the gap is what it leaves out, covered below.
Why the right remedy depends on direction
In brief
A remedy that helps after a westward flight can backfire after an eastward one, because the clock moves in opposite directions. Work out whether you are advancing or delaying your clock, then time light and any melatonin to match.
A remedy that helps after a westward flight can backfire after an eastward one, because the clock has to move in opposite directions. Travelling west, you need to delay your clock, so light later in the day helps. Travelling east, you need to advance it, so light early in the destination morning helps, and badly timed light can push you the wrong way (Roach & Sargent, Frontiers in Physiology 2019).
Melatonin timing inverts in the same way. This is why generic “take melatonin and get some sun” advice is incomplete: without the direction, the timing can be exactly wrong. The asymmetry, and why east is harder, is explained in eastward versus westward jet lag. The single most useful planning step is to work out whether you are advancing or delaying your clock, then time light and any melatonin to match.
Melatonin: useful, with rules
In brief
Melatonin has the best evidence of any supplement for jet lag, helping most on eastward flights crossing five or more time zones. Two rules: timing beats dose, and in the UK it is prescription-only.
Melatonin has the best evidence of any supplement for jet lag. A Cochrane review of ten trials found that melatonin taken close to target bedtime at the destination reduced jet lag after flights crossing five or more time zones, and judged it effective and safe for occasional short-term use (Herxheimer & Petrie, Cochrane review). It helps most travelling east and across larger shifts.
Two rules matter for British travellers. Timing beats dose: higher amounts are not more effective and can leave you groggy. And in the UK, melatonin is a prescription-only medicine, not a supplement you can buy off the shelf, so using it means a conversation with your GP rather than an online order. We cover the specifics separately in our guide to melatonin for jet lag.
What hydration and IV drips actually fix
In brief
Hydration eases dehydration, part of travel fatigue, so it helps you feel better on arrival, but it does not move your clock. The same is true of IV jet lag drips: reasonable as a fatigue remedy, overpromising as a jet lag cure.
Hydration is worth getting right, but for the correct reason. The dry cabin contributes to dehydration, which is part of travel fatigue, so drinking water helps you feel better on arrival. It does not move your body clock, so it does nothing for jet lag itself. The same logic applies to intravenous “jet lag” drips, which deliver fluid, electrolytes and vitamins: they can ease dehydration and the general flatness of a long journey, but the circadian misalignment that defines jet lag is untouched, because timing is not a fluid problem. Treated as a fatigue remedy they are reasonable; sold as a jet lag cure they overpromise.
The recovery layer most remedies miss
In brief
Standard advice addresses circadian timing. A separate layer, how quickly the body restores autonomic balance and circulation after a flight, affects recovery independently of the clock and is the one most advice ignores.
Standard advice addresses circadian timing: light, melatonin, meal timing. A separate physiological layer sits beneath it. How quickly the body restores autonomic balance, circulation and felt energy after a flight affects recovery independently of where the clock is, and it is the layer most jet lag advice ignores entirely. The two are complementary: timing realigns the clock, while circulatory recovery supports how the body feels and functions while that realignment happens.
This is where clinical support fits for travellers who want more than rest. Aurion Reset is a clinician-supervised recovery protocol at the Aurion clinic in Mayfair, designed for travellers landing into a demanding schedule. A session lasts 75 minutes, including a clinician consultation and 45 minutes of active PureFlow™, heart-synchronised pneumatic compression designed to support circulation and oxygenation while you remain at rest. It works alongside correctly timed light and sleep, not instead of them.
Frequently asked questions
What is the most effective remedy for jet lag?
Correctly timed light exposure is the most effective remedy, because light is the strongest cue for resetting the body clock. For flights crossing five or more time zones, particularly travelling east, melatonin taken near destination bedtime adds further benefit. The two together, timed to the direction of travel, outperform any single intervention. Hydration and sensible caffeine help you feel better but do not reset the clock.
Do jet lag pills and supplements work?
Melatonin is the only supplement with strong evidence for jet lag, and in the UK it is prescription-only. Most other jet lag pills, including high-dose vitamin C and homeopathic remedies, have no credible mechanism for shifting the body clock and little supporting evidence. Some may help you feel marginally better by addressing tiredness, but they do not treat the circadian misalignment that causes jet lag.
Are IV drips good for jet lag?
IV drips can ease dehydration and the general fatigue of a long flight, but they do not address jet lag itself, which is a timing problem rather than a fluid one. If you are mainly travel-fatigued after a long flight across few time zones, a drip may help you feel better. For genuine jet lag after a large time-zone change, timed light and, where appropriate, melatonin do the work that a drip cannot.
What is the fastest way to recover from jet lag?
Shift your clock deliberately rather than waiting it out. Get outdoor light at the right end of the destination day for your direction of travel, eat on local meal times, and use melatonin near bedtime if you are crossing five or more time zones eastward and your GP agrees. Protecting sleep and supporting circulation help the body cope while the clock realigns.
Does drinking water help jet lag?
Water helps with travel fatigue, not jet lag. The dry cabin air contributes to dehydration, so staying hydrated will make you feel better in the first day or two after a long flight. It does not move your body clock, however, so the underlying jet lag resolves only as your circadian rhythm shifts to local time through light and time.
When the next day matters
Aurion Reset is a clinician-supervised recovery protocol at our private clinic in Mayfair, designed for travellers who land tired and need to be at full capacity the morning after.
Discover Aurion Reset