Melatonin

Q: What does melatonin actually work for?

The clearest wins are **falling asleep faster** and **recovering from jet lag faster**. Sleep quality and total sleep time improve a bit, but melatonin looks less reliable if your main problem is staying asleep all night.

Q: How much melatonin should you take for sleep?

Sleep trials span **0.1-15 mg**, and benefits show up well below the mega-dose range. A practical starting point sits on the lower end because more melatonin doesn't automatically mean more sleep, and higher doses raise the odds of grogginess and vivid dreams.

Q: When should you take melatonin?

Take it **30-60 minutes before the bedtime you want**, not after you already miss the window. For jet lag, line it up with **local bedtime at your destination** so it resets your clock in the new time zone.

Melatonin isn't sleep in a bottle. It's the timestamp your body reads to know when night starts — and when that signal lands at the right moment, you fall asleep faster and jet lag hurts a lot less.

108 papers 105 claims 213 outcomes

Reduce inflammatory flare-up signals Recover faster after exercise Recover from jet lag faster Fall asleep faster Steady your blood sugar levels Last longer before giving out

Melatonin is a hormone your brain releases when light drops in the evening. Your body uses it as a darkness message, not a knockout drug, so supplements work best when your internal clock drifts off schedule or bedtime arrives before your brain gets the memo.

Melatonin works like a scheduled dimmer switch for your brain's master clock: it binds MT1 and MT2 receptors in the timing center that coordinates sleepiness, body temperature, and hormone timing, so your whole system shifts toward night mode.³⁴ That explains why it shines most when your timing is the problem — like jet lag or trouble falling asleep — because it nudges the clock itself more than it forces sedation.¹²³

Dosing

How to take melatonin

Range

Clinical trials for sleep used 0.1-15 mg, with many successful protocols clustering around 0.3-5 mg at night. Jet lag studies used 0.3-8 mg, usually across the first few local bedtimes after travel.¹²

Timing

Take melatonin 30-60 minutes before the bedtime you want to hit. For jet lag, anchor it to local bedtime at your destination; melatonin works best as a clock-setting cue, not as a rescue pill after midnight.²³⁴

Form

Immediate-release melatonin matches the strongest data on falling asleep faster because it creates a sharper bedtime signal. Prolonged-release forms show up more often in sleep-maintenance studies and older adults, but the results on staying asleep all night are mixed.¹³

What works

7 claims with strong evidence

Likely strong benefit

Reduce inflammatory flare-up signals

Fewer alarm signals reaching your joints, gut, and other tissues. ^33581247

1-219.9 mg 1 studies 1.5k people

Ranks #1 of 17 supplements

Proven benefit

Recover faster after exercise

Less soreness, less inflammation, and quicker return to form after hard training. ^{40559702,38613044,41769636}

3-100 mg 3 studies 206 people

Ranks #2 of 42 supplements

Proven benefit

Recover from jet lag faster

Gets your internal clock back on local time so you lose fewer days. ^{11279722,2496815,3085768 +7}

0.3-8 mg 0-6 weeks 10 studies 976 people

Ranks #1 of 2 supplements

Proven benefit

Fall asleep faster

Shrinks the gap between hitting the pillow and actually sleeping. ^{15914575,16423108,20712869 +27}

0.1-15 mg 0-52 weeks 30 studies 2.4k people

Ranks #1 of 17 supplements

Likely benefit

Steady your blood sugar levels

Keeps fasting glucose and your three-month average in a healthier range. ^{25937837,32802105,33766084 +3}

0.3-100 mg 8-10 weeks 6 studies 2.5k people

Likely benefit

Last longer before giving out

More reps, more miles, and a higher ceiling before fatigue forces you to stop. ^41769636

1 studies 266 people

Ranks #5 of 41 supplements

Likely benefit

Reduce everyday pain intensity

Lower intensity, fewer flares, and longer stretches of relief. ^{32455582,36104141,38355388 +5}

2-20 mg 4-12 weeks 8 studies 4.5k people

Ranks #8 of 47 supplements

More findings

Smaller effects and promising leads

Sleep longer each night Proven modest benefit

More genuine sleep hours so your body finishes its repair cycles. ^{11696071,15914575 +23}

25 studies 0.1-24 mg

Ease the burden of dementia caregiving Proven modest benefit

Less energy spent managing resistance, more spent on real connection. ^{32455582,36104141 +1}

3 studies 2-20 mg

Reduce the emotional weight of pain Proven modest benefit

Pain feels less overwhelming and occupies less headspace. ^{32455582,36104141 +1}

3 studies 2-20 mg

Jump higher and react faster Proven modest benefit

More explosive takeoff force and quicker ground contact. ^{39972597,41769636}

2 studies 3-10 mg

Lower low-grade inflammation Proven modest benefit

Brings down C-reactive protein, a blood marker your doctor tracks. ^{28503495,31023972 +10}

12 studies 0.3-219.9 mg

Improve overall sleep quality Likely modest benefit

Deeper, less interrupted nights that leave you recharged by morning. ^{15914575,20712869 +26}

28 studies 0.1-50 mg

Reduce everyday fatigue Likely modest benefit

Less of that heavy, worn-out feeling that makes simple tasks feel like a chore. ^{23432361,2496815 +4}

6 studies 2-20 mg

Wake up clear-headed Likely modest benefit

Less grogginess, more energy from the moment you open your eyes. ^{38764237,24718775 +17}

19 studies 0.5-50 mg

Reduce belly and deep abdominal fat Likely modest benefit

Targets the visceral fat that wraps around your organs and drives inflammation. ^{25937837,28503495 +3}

5 studies 0.3-100 mg

Lower perceived effort during exercise Likely modest benefit

Same workout, same pace, but it feels less punishing. ^{38613044,40559702}

2 studies 5-10 mg

Ease anxiety around surgery Likely modest benefit

Calms the dread that builds before procedures and dental visits. ^{33319916,39359816}

2 studies 0.5-10 mg

Lose body fat Proven but unnoticeable

Body fat percentage drops and the mirror shows it before the scale does. ^{33766084,41515249}

2 studies 0.3-100 mg

Ease cold and flu severity Proven but unnoticeable

When you do get sick, the whole experience hits lighter. ^{27165014,30653130 +1}

3 studies 2-6 mg

Ease headache and migraine pain Proven but unnoticeable

Dials down how intense each headache feels when it hits. ^{27165014,30653130 +1}

3 studies 2-6 mg

Lose weight on the scale Likely real but unnoticeable

Less weight on your joints, better blood markers, easier movement. ^{27165014,28503495 +7}

9 studies 0.3-100 mg

Get fewer headaches and migraines Likely real but unnoticeable

Cuts the number of attacks per month so headache days stop piling up. ^{27165014,30653130 +1}

3 studies 2-6 mg

Reduce migraine disruption Likely real but unnoticeable

Headaches steal fewer workdays, social plans, and hours of patience. ^{30653130,41627537 +1}

3 studies 2-6 mg

Boost sprint speed and peak power Likely real but unnoticeable

More watts and faster times in short all-out efforts. ^{39972597,41769636}

2 studies 3-10 mg

Lower bad and total cholesterol Likely real but unnoticeable

Cuts the cholesterol that builds into artery plaque over time. ^{38965577,41515249 +4}

6 studies 0.3-100 mg

17 promising leads — boost overall cognitive performance, lower tnf-alpha inflammation, sharpen visual and spatial memory, retrieve words faster mid-sentence, and 13 more

Boost overall cognitive performance — Broad gains in memory, speed, and mental sharpness at once. ^35075641

1 studies · 40 people

Lower TNF-alpha inflammation — Reduces one of the immune system's strongest pro-inflammatory signals. ^{33581247,38613044 +2}

4 studies · 2.0k people

Sharpen visual and spatial memory — Hold onto faces, scenes, and locations with less effort. ^32302347

1 studies · 35 people

Retrieve words faster mid-sentence — The right word surfaces instead of stalling on the tip of your tongue. ^32302347

1 studies · 35 people

Hold power across repeated sprints — Burst speed and power fade less as efforts stack up. ^40559702

1 studies · 24 people

Boost cardiovascular exercise output — Your heart pushes more blood per beat and sustains higher intensity longer. ^40559702

1 studies · 24 people

Improve daily life with acid reflux — Heartburn and regurgitation interfere less with meals, sleep, and comfort. ^37768310

1 studies · 72 people

Strengthen oral antioxidant defense — Raises antioxidant levels in your saliva to protect gums and cheeks. ^{31450726,34184295 +4}

6 studies · 1.7k people

Speed up thinking and reactions — Shortens the gap between seeing a question and having the answer. ^{32302347,25862116}

2 studies · 53 people

Reduce itching — Calms itch intensity on body and scalp so you stop reaching to scratch. ^34567175

1 studies · 80 people

Ease stomach and belly pain — Fewer pain episodes and less intensity when they hit. ^{15914575,20082715 +2}

4 studies · 180 people

Ease constipation and stay regular — Softer stools, less straining, and more complete bowel movements. ^37098505

1 studies · 68 people

Strengthen planning and mental control — Organize priorities, switch tasks, and catch mistakes more easily. ^32302347

1 studies · 35 people

Reverse fatty liver buildup — Shrinks fat deposits in the liver and calms the inflammation driving disease forward. ^28503495

1 studies · 97 people

Increase antioxidant defenses — Your blood neutralizes oxidants faster, before they damage cells. ^{31450726,34184295 +6}

8 studies · 1.7k people

Improve ovulation and fertility hormones — Strengthens the estrogen and progesterone signals that drive ovulation. ^28293053

1 studies · 66 people

Ease nerve pain and sensitivity — Overactive nerves calm down so ordinary touch stops feeling threatening. ^25052847

1 studies · 42 people

59 early-stage findings — stay alert on long drives, improve everyday quality of life, lower your resting heart rate, keep arteries flexible, and 55 more

Stay alert on long drives — Sharper reaction times and steadier steering when driving fatigue sets in. ^{24718775 +5}

6 studies

Improve everyday quality of life — Fewer days where health problems dictate what you can and cannot do. ^{37457114 +3}

4 studies

Lower your resting heart rate — Each beat pushes more blood, so your heart needs fewer beats per minute. ^{10792199 +3}

4 studies

Keep arteries flexible — Artery walls that stretch and recoil absorb each heartbeat smoothly. ^{34184295 +1}

2 studies

Lower your blood pressure — Brings down both systolic and diastolic, especially when baseline runs high. ^{10792199 +8}

9 studies

Quiet persistent ear ringing — Turns down the volume so tinnitus fades into the background. ^28966750

1 study

Lower elevated liver enzymes — Brings down blood markers that spike when liver cells are damaged. ^{28503495 +6}

7 studies

Ease indigestion and heartburn — Less upper-stomach heaviness, burning, and acid discomfort after eating. ^{20082715 +1}

2 studies

Boost skin hydration — Locks more moisture into skin so it feels softer and less tight. ^39852376

1 study

Stay independent longer with aging — Bathing, dressing, climbing stairs, and daily tasks stay within reach. ^{23432361 +1}

2 studies

Restore interest and enjoyment — Brings back the ability to feel pleasure in things that used to matter. ^16437462

1 study

Build and keep muscle — More muscle tissue, better body composition, and size that reflects the work you put in. ^31023972

1 study

Sharpen focus and mental stamina — Concentrate longer, resist distraction, and stay mentally sharp through demanding tasks. ^38613044

1 study

Reduce daily stress — Everyday pressure stops running your nervous system hot. ^38764237

1 study

Build stronger muscles — Higher one-rep max, stronger grip, and more force from every muscle group. ^{41769636 +1}

2 studies

Strengthen social engagement — Reduces the withdrawal, fatigue, and low drive that make you cancel plans. ^29347988

1 study

Lower multiple inflammation markers — Several inflammation blood markers drop together, not just one in isolation. ^37181363

1 study

Blunt blood pressure spikes — Keeps your numbers steadier when stress, caffeine, or exertion hits. ^24495468

1 study

Buffer the burn during hard efforts — Acid builds up slower in muscles during intense exercise. ^38613044

1 study

Improve overall sexual function — Every phase improves: desire, arousal, comfort, and orgasm. ^41693954

1 study

Improve insulin sensitivity — Your cells respond to insulin again so your pancreas works less hard. ^{25197811 +4}

5 studies

Boost circulation to hands and brain — More blood reaches your fingers, toes, and brain through the tiniest vessels. ^38110301

1 study

Spend more time in REM sleep — More time in the sleep stage that processes emotions and consolidates memory. ^{25862116 +1}

2 studies

Reduce missed work and activity days — Fewer days calling in sick or skipping plans because of symptoms. ^29347988

1 study

Reduce hot flashes and night sweats — Fewer episodes and milder flushes, especially overnight. ^24718775

1 study

Strengthen natural killer cell activity — You field more cells that destroy infected and abnormal cells on contact. ^33681747

1 study

Reduce oxidative damage to your DNA — Less daily wear on your genetic material inside each cell. ^31450726

1 study

Improve kidney filtration rate — Your kidneys clear waste from the blood more effectively. ^38613044

1 study

Speed muscle repair after training — Your body releases more repair hormones after hard exercise. ^22370698

1 study

Reduce metabolic syndrome markers — Brings down the blood sugar, blood pressure, and belly fat that cluster together. ^25937837

1 study

Improve blood vessel relaxation — Boosts nitric oxide where you need it for circulation, dials it back where it causes harm. ^34707777

1 study

Sharpen accuracy and agility in sport — Execute skills more precisely when fatigue and pressure mount. ^38613044

1 study

Ease the full menopause symptom load — Less joint pain, fewer palpitations, and cooler nights. ^41693954

1 study

Lower the internal cost of exercise — Same effort feels easier as your body works more efficiently. ^38110301

1 study

Build glutathione antioxidant levels — Your cells' main internal antioxidant defense gets deeper reserves. ^33811754

1 study

Reduce oxidative cell damage — Less oxidative damage to your cell membranes, proteins, and DNA. ^{29142618 +10}

11 studies

Boost vaccine response — Your body builds more antibodies and longer-lasting memory from each shot. ^39539030

1 study

Ease inflammation tied to metabolism — Fat tissue produces fewer inflammatory signals and more protective ones. ^29142618

1 study

Ease hormonal swings in menopause — Smooths the estrogen drop and overactive pituitary signals behind hot flashes. ^22370698

1 study

Reduce excess androgens in PCOS — Lowers the hormones that cause acne, unwanted hair, and missed periods in PCOS. ^38965577

1 study

Lower triglycerides — Reduces the blood fats that rise after meals and drive heart risk. ^{25937837 +5}

6 studies

Raise good cholesterol levels — Boosts the cholesterol that pulls fat out of artery walls. ^{25937837 +3}

4 studies

Lift and steady your mood — Good days come more often and bad ones feel less heavy. ^{34567175 +5}

6 studies

Lower day-to-day anxiety — The background hum of worry that colors everything gets quieter. ^{15914575 +4}

5 studies

Ease anxiety in older adults — Quiets the health worries and body tension that build with age. ^{15914575 +4}

5 studies

Reduce pre-competition anxiety — Quiets the overthinking that hijacks execution right before you compete. ^{15914575 +4}

5 studies

Ease depression symptoms — Lowers the weight of sadness, low energy, and emotional numbness over weeks. ^{15914575 +8}

9 studies

Ease winter depression symptoms — Compensates for the sunlight deficit when days get short. ^{15914575 +8}

9 studies

Ease depression tied to chronic pain — When pain loosens its grip, mood follows. ^{15914575 +8}

9 studies

Increase deep, restorative sleep — More time in the sleep stages where your body does its heaviest repair. ^{25862116 +1}

2 studies

Break the insomnia cycle — Quiets the nervous-system overdrive that keeps you wired at bedtime. ^{29912983 +5}

6 studies

Ease endometriosis pelvic pain — Daily life and intimacy stop being filtered through constant discomfort. ^{27000311 +1}

2 studies

Reduce caregiver burden and stress — Caring for a loved one feels less overwhelming day to day. ^{35246237 +2}

3 studies

Reduce dizziness when standing up — Your blood pressure adjusts faster when you go from sitting to standing. ^24495468

1 study

Reduce period cramp intensity — Cramps hurt less, end sooner, and need fewer painkillers. ^34668986

1 study

Shorten migraine attacks — Each episode wraps up sooner so you recover your day faster. ^{27165014 +3}

4 studies

Stay asleep through the night — Fewer wake-ups and more unbroken hours of real rest. ^{23129488 +19}

20 studies

Flatten post-meal blood sugar spikes — Blunts the glucose surge after eating so energy stays level. ^{25197811 +1}

2 studies

Reduce dizziness when standing — Less lightheadedness and weakness when you go from sitting to standing. ^24495468

1 study

What doesn’t help

Claims without support

Reduce PCOS skin and hair symptoms

Eases excess hair, thinning scalp hair, and breakouts from PCOS.

Reduce pain after surgery

Recovery hurts less in the first days and stays quieter in the months after.

Ease eczema flares

Less redness, fewer outbreaks, and reduced need for steroid creams.

Safety

What to watch for

⚠

fatigue — severe

⚠

insomnia — severe

⚠

major side effects (severe dizziness, vivid nightmares, crippling drowsiness, severe headache, behavioral changes, pain worsening) — severe

⚠

major side effects (combination arm: severe dizziness, vivid nightmares, drowsiness, severe headache, behavioral changes, pain worsening) — severe

⚠

drowsiness — severe

⚠

nausea — severe

⚠

stroke (acute ischemic event) — severe

⚠

severe sedation / somnolence — severe

Interactions

Drug and supplement interactions

other — moderate, decreases_effect

lipid_modifying_agents — moderate, increases_effect

metformin — moderate, increases_effect

blood_glucose_lowering — moderate, increases_effect

antineoplastic_agents — moderate, increases_effect

hypnotics_and_sedatives — moderate, additive

other — moderate, increases_concentration

antithrombotic_agents — moderate, increases_toxicity

antihypertensives — moderate, decreases_effect

antithrombotic_agents — moderate, increases_toxicity

Synergies

What pairs well

Calcium

8 shared endpoints · d=0.28

Vitamind

8 shared endpoints · d=0.28

Caffeine

4 shared endpoints · d=1.33

Vitamink

1 shared endpoints

Strontium

1 shared endpoints

The bottom line

Melatonin earns its spot if you take forever to fall asleep or your body clock gets wrecked by travel. It looks much less impressive if your main issue is waking up in the middle of the night, and bigger doses don't guarantee better sleep. If you get next-day drowsiness, dizziness, headaches, or vivid dreams, melatonin is the wrong dose, the wrong timing, or just the wrong fit for you.¹²³

Frequently asked

Common questions

What does melatonin actually work for?

The clearest wins are falling asleep faster and recovering from jet lag faster. Sleep quality and total sleep time improve a bit, but melatonin looks less reliable if your main problem is staying asleep all night.¹²

How much melatonin should you take for sleep?

Sleep trials span 0.1-15 mg, and benefits show up well below the mega-dose range. A practical starting point sits on the lower end because more melatonin doesn't automatically mean more sleep, and higher doses raise the odds of grogginess and vivid dreams.¹³

When should you take melatonin?

Take it 30-60 minutes before the bedtime you want, not after you already miss the window. For jet lag, line it up with local bedtime at your destination so it resets your clock in the new time zone.²³⁴

Does melatonin help you stay asleep?

Sometimes, but the research doesn't line up cleanly. The evidence for sleep onset is much stronger than the evidence for fewer night awakenings.¹³

Can you take melatonin every night?

Lots of people do, but nightly use only makes sense if the dose and timing actually improve your sleep. If you wake up groggy, dizzy, headachy, or stuck with vivid dreams, the setup is wrong for you.³

Track melatonin in the app

Log doses, check interactions, see how it compares to alternatives — all evidence-based.

Join the waitlist

Sources

1. Meta-analysis: melatonin for the treatment of primary sleep disorders (2013) ↑
2. Melatonin for the prevention and treatment of jet lag (2002) ↑
3. Melatonin
4. Circadian Rhythms

Generated April 3, 2026