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Melatonin

Best studied for: Jet lag; Insomnia and trouble falling asleep; Shift work sleep disruption. Best known for resetting your sleep-wake cycle.

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What is melatonin? Melatonin is a hormone produced by the pineal gland in the brain. It is involved in regulating the body's circadian rhythm, which is the internal biological clock that helps control when we feel awake and when we feel asleep. How does it work? Melatonin works by regulating the body's circadian rhythm, which can be disrupted by various factors such as aging, changes in sleep patterns, exposure to artificial light, and jet lag. When taken as a supplement, melatonin can help people fall asleep faster and stay asleep longer, making it useful for people who have trouble sleeping. What are the active ingredients that are important for its medicinal properties? The active ingredient in melatonin supplements is melatonin. What forms does it come in? Melatonin supplements come in various forms including tablets, capsules, gummies, and liquid drops. When was it first used for medicinal purposes? Melatonin was first used as a supplement in the early 1990s. What if there’s an imbalance or deficiency? A deficiency or imbalance in melatonin can cause disrupted circadian rhythms and sleep disorders such as insomnia, difficulty falling asleep, and nighttime waking. Summary: Melatonin is a hormone produced by the pineal gland in the brain that helps regulate the body's circadian rhythm. As a supplement, it can help with sleep-related conditions such as insomnia, delayed sleep phase disorder, and jet lag. It is available in various forms and is generally well tolerated with few side effects. The recommended daily dose of melatonin varies, but it is typically taken at bedtime for best results.

Helps

What does Melatonin help with? Melatonin is a hormone your body makes at night. Aaron Lerner isolated and named it at Yale University in 1958. Long before that, old medical traditions treated the pineal gland, which makes it, as important. Jet lag after flying across time zones Strong evidence — repeated randomised trials in travellers; trial sizes not on file. In these trials, people took melatonin near bedtime at their destination. Most reported better sleep and daytime alertness within 2 to 3 days . The usual adjustment takes about a week. Evidence grade A · Traditional tier T0 Trouble falling asleep at night Strong evidence — many randomised trials of sleep onset; sizes not on file. Studies found melatonin cut the time it took people to drift off. The effect was modest. People whose body clock had drifted late gained the most. Evidence grade A · Traditional tier T0 Nerves before an operation Strong evidence — a number of clinical trials in adults and in children. In these trials, people felt less anxious before their procedure. The size of the effect matched low-dose benzodiazepines. Reports noted less grogginess and no worries about dependence. Evidence grade A · Traditional tier T0 Bedtime struggles in children with ADHD or autism Strong evidence — controlled trials in both groups of children. Children in these trials fell asleep sooner and slept longer in total. Low doses caused no serious side effects in the trials on file. Their own melatonin release is often late or weak, which comes from body-clock measures rather than a trial result. Evidence grade A · Traditional tier T0 Being wide awake until 2 to 4 AM (delayed sleep phase) Good evidence — human trials using timed low doses; small numbers. Trials used low doses, often as little as 0.5 mg . People took it in the early evening, hours before their natural sleep time. Sleep timing then shifted earlier bit by bit. Evidence grade B · Traditional tier T0 Sleeping by day when you work shifts Good evidence — human trials in shift workers; fewer and smaller than the jet lag work. Shift workers took melatonin before their planned sleep period. In these studies they fell asleep faster, even with daylight outside. The goal was to help the body accept an odd sleep window. Evidence grade B · Traditional tier T0 Broken sleep in later life Good evidence — trials of low-dose, slow-release melatonin in older adults. In these trials, older adults reported better sleep quality and next-day alertness. Slow-release forms were the ones studied most. Melatonin output falls with age, which is well established in body-clock science rather than a finding from these trials. Evidence grade B · Traditional tier T0 Migraine and cluster headache Early evidence — small and early human studies. Small studies found fewer and milder migraine attacks with regular use. Cluster headache follows a tight daily rhythm, and melatonin was studied to steady that pattern. Researchers tie this to anti-inflammatory and pain-damping action, an idea that rests on lab work. Evidence grade C · Traditional tier T0 Belly pain and bloating with IBS Early evidence — small human studies suggesting benefit. In these studies, people reported less belly pain and bloating. The gut makes far more melatonin than the brain does, which is a lab finding about tissue. Calmer gut movement and less gut sensitivity are proposed reasons, not proven ones. Evidence grade C · Traditional tier T0 What Melatonin has not been shown to do For winter low mood, the work on file paired melatonin with carefully timed light therapy, not melatonin on its own. The library holds no human trial of melatonin for staying alert while working a night shift. How to read this: Each use above has its own grade. A means steady results from randomised trials in people. B means at least one good human trial. C means small or early human work. D means weak or mixed human results. Insufficient means no human study at all. This page reports what studies found. I

Melatonin

Melatonin

Quick Facts

  • What it is: A hormone your brain naturally produces at night to signal that it's time to sleep — available as a supplement to help when that signal gets disrupted.
  • Main uses: Best known for resetting your sleep-wake cycle, easing jet lag, and helping shift workers or people with insomnia fall asleep more naturally.
  • Best for: Jet lag, Insomnia and trouble falling asleep, Shift work sleep disruption
  • Active ingredients: Melatonin (N-acetyl-5-methoxytryptamine)
  • Forms: tablet, capsule, sublingual tablet, liquid drops, gummy, extended-release tablet, transdermal patch
  • Time to effect: Typically 30–60 minutes for sleep onset; jet lag and circadian reset may take 2–5 days of consistent use
  • Side effects: Generally very well tolerated at low doses — the most common complaints are morning grogginess and vivid dreams, usually from taking too much.
  • Pregnancy & breastfeeding: Not assessed for this entry. Ask your doctor or midwife before use.

Educational information, not medical advice — ask your doctor or midwife.

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What is melatonin?

Melatonin is a hormone produced by the pineal gland in the brain. It is involved in regulating the body's circadian rhythm, which is the internal biological clock that helps control when we feel awake and when we feel asleep.

How does it work?

Melatonin works by regulating the body's circadian rhythm, which can be disrupted by various factors such as aging, changes in sleep patterns, exposure to artificial light, and jet lag. When taken as a supplement, melatonin can help people fall asleep faster and stay asleep longer, making it useful for people who have trouble sleeping.

What are the active ingredients that are important for its medicinal properties?

The active ingredient in melatonin supplements is melatonin.

What forms does it come in?

Melatonin supplements come in various forms including tablets, capsules, gummies, and liquid drops.

When was it first used for medicinal purposes?

Melatonin was first used as a supplement in the early 1990s.

What if there’s an imbalance or deficiency?

A deficiency or imbalance in melatonin can cause disrupted circadian rhythms and sleep disorders such as insomnia, difficulty falling asleep, and nighttime waking.

Summary:

Melatonin is a hormone produced by the pineal gland in the brain that helps regulate the body's circadian rhythm. As a supplement, it can help with sleep-related conditions such as insomnia, delayed sleep phase disorder, and jet lag. It is available in various forms and is generally well tolerated with few side effects. The recommended daily dose of melatonin varies, but it is typically taken at bedtime for best results.

Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.

Remedies related to Melatonin

Aloe VeraAsafoetida (Angozeh — Persian)Avicenna Digestive BlendBai Zhu (Atractylodes)Bifidobacterium LongumBlue Light Blocking GlassesBlue Light TherapyCocculusDoxylamine Succinate (Sleep Aid)L-tryptophanMarjoram/Lavender/Cedarwood Sleep BlendSleep Hygiene

People take Melatonin when they say

Everyday descriptions of the problems this remedy is recommended for.

Conditions where Melatonin is recommended

Each grade below is for that condition specifically, not for Melatonin in general.

Natural options for Delayed Sleep Phase Syndrome, ranked by evidence

The option with the best evidence for Delayed Sleep Phase Syndrome, with its grade and who should avoid it. One email.

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