Melatonin
Useful mainly for adults with jet lag, delayed sleep phase, or shift-work sleep disruption.
Quick decision guide
May help most
Adults with jet lag, delayed sleep phase, or shift-work sleep disruption
Common dosing range
0.3–5 mg, 30–60 minutes before intended sleep
When to expect effects
Hours (circadian shift takes days to weeks)
Watch out for
Potentiates anticoagulants and sedatives; long-term safety in children is not established
What is it
Melatonin is a hormone produced naturally by the pineal gland in response to darkness that signals the body's transition to nighttime and helps regulate the sleep-wake cycle. It is also available as a dietary supplement, commonly used as a short-term sleep aid and for circadian rhythm adjustment.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Effect | Best fit | Time |
|---|---|---|---|
jet lag Good Evidence | Moderate; reduces jet lag severity and shortens recovery time by 1–2 days | Travelers crossing 3+ time zones, especially eastward travel | 1–3 days |
sleep onset insomnia Good Evidence | Modest; reduces sleep onset by ~7–10 minutes on average vs placebo | Adults with delayed sleep onset or general insomnia | Hours to days |
shift work sleep disorder Limited Evidence | Modest and variable; more consistent for sleeping after a night shift | Shift workers who need to sleep during daylight hours | Days |
jet lag
- Effect
- Moderate; reduces jet lag severity and shortens recovery time by 1–2 days
- Best fit
- Travelers crossing 3+ time zones, especially eastward travel
- Time
- 1–3 days
sleep onset insomnia
- Effect
- Modest; reduces sleep onset by ~7–10 minutes on average vs placebo
- Best fit
- Adults with delayed sleep onset or general insomnia
- Time
- Hours to days
shift work sleep disorder
- Effect
- Modest and variable; more consistent for sleeping after a night shift
- Best fit
- Shift workers who need to sleep during daylight hours
- Time
- Days
Evidence for 3 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
jet lag
Supplement benefitMultiple RCTs and Cochrane reviews confirm melatonin (0.5–5 mg taken at destination bedtime) reduces jet lag severity and jet lag duration. Effects are most consistent with eastward travel and crossing 5+ time zones. Timing at destination bedtime rather than home bedtime is critical for efficacy.
Bottom line: The most evidence-backed non-prescription option for jet lag; take at destination bedtime on the day of travel.
sleep onset insomnia
Supplement benefitMeta-analyses show melatonin modestly reduces sleep onset latency and improves sleep quality scores compared to placebo. The effect on time to fall asleep (around 7–10 minutes) is statistically significant but modest compared to prescription sedative-hypnotics. Melatonin works primarily as a chronobiotic — it resets timing — rather than as a sedative.
Bottom line: Modest but real reduction in sleep onset time; most appropriate for circadian timing issues rather than pure insomnia.
shift work sleep disorder
Supplement benefitRCTs in shift workers show melatonin can modestly improve daytime sleep duration and quality when taken shortly before daytime sleep after a night shift. Results are more variable than for jet lag. Light-blocking strategies (blackout curtains) combined with melatonin produce better outcomes than melatonin alone.
Bottom line: Can help shift workers sleep during the day, but effect is modest and depends on good sleep environment.
How it works
How to take it
What to track
3 commercial forms
Compare the main delivery options and what they’re best suited for.
Immediate-release
Best suited for difficulty falling asleep. Available in tablets, capsules, sublingual, and gummies.
Rapid onset within 30 to 60 minutes; short half-life of about 40 minutes.
Extended-release
Often used for sleep maintenance issues, particularly in older adults. May reduce middle-of-the-night awakenings.
Slower release designed to mimic the body's natural overnight melatonin pattern.
Sublingual / liquid
Useful for rapid sleep onset and for people who prefer to avoid swallowing pills.
Absorbed through the oral mucosa, potentially faster onset than swallowed tablets.
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Who should avoid it
- Children and adolescents — only under pediatric supervision given developmental concerns
- People taking anticoagulants (warfarin) without medical guidance
- People with autoimmune conditions — melatonin modulates immune function
Pregnancy & breastfeeding
Avoid during pregnancy and breastfeeding — insufficient safety data; melatonin is a hormone with potential developmental effects.
Interactions
Melatonin may potentiate anticoagulant effect, increasing bleeding risk
Additive CNS depression and drowsiness
CYP1A2 inhibition markedly raises melatonin blood levels
Melatonin's immune-modulating activity may interact with immunosuppressive regimens
Melatonin may modestly affect blood pressure; monitor
Estrogens inhibit melatonin metabolism, raising blood levels — may increase sedation
Documented interactions
Evidence-graded pair pages with sources, dosing notes, and timing guidance — a complement to the narrative section above.
Warnings (7)
+ caffeine
moderateCaffeine and melatonin push the sleep-wake system in opposite directions. Caffeine taken too late in the day suppresses your own melatonin, delays your internal clock, and can blunt the effect of a melatonin supplement.
+ propranolol
moderatePropranolol blocks the beta-adrenergic signal the pineal gland uses to make melatonin at night, lowering the body's own nighttime melatonin.
+ alprazolam
moderateAlprazolam and melatonin both promote sleep and can produce additive sedation, so taking them together may increase drowsiness, slow reaction time, and carry over into next-day grogginess. The combination is generally manageable but warrants your prescriber's awareness, especially for older adults and anyone who drives in the morning.
+ diphenhydramine
moderateDiphenhydramine and melatonin both promote sleepiness through different mechanisms (H1 antihistamine blockade and MT1/MT2 receptor activation). Used together they have an additive sedating effect, which can mean heavier-than-expected drowsiness, lingering next-day grogginess, slower reaction time, and a higher fall risk, especially in older adults.
Protocols featuring Melatonin
Evidence-backed routines where Melatonin plays a role.
Falling Asleep Faster
sleep
Sleep-onset insomnia (difficulty falling asleep) is mechanistically distinct from sleep-maintenance issues (waking up). The drivers are usually nervous system over-activation, melatonin signaling, and core body temperature — not deep sleep architecture. This stack targets sleep onset specifically: magnesium for GABA modulation, L-theanine for alpha-wave relaxation, low-dose melatonin as a circadian signal (NOT a sedative), and glycine for the core body temperature drop that precedes sleep. Use this for "I can''t turn my brain off at night" patterns. If you fall asleep fine but wake up at 3 AM, see Staying Asleep instead.
Eastbound Jet Lag (5+ zones)
jet lag
Eastbound travel is the harder direction because your body is being asked to fall asleep earlier than its current circadian phase wants. The internal clock shifts about 1 hour per day naturally — so a 5-zone flight east takes about 5 days to fully reset on its own. The goal of this protocol is to compress that to 2-3 days by combining a phase-advancing melatonin dose with sleep-supportive nutrients. The melatonin dose is deliberately low (0.3 mg). Higher over-the-counter doses (3-10 mg) are LESS effective for phase-shifting than the low dose, and more likely to cause next-day grogginess. The mechanism is hormonal, not sedative — you want the smallest dose that registers as a signal, not the largest dose that knocks you out. This is a 5-day protocol — start the night you arrive at your destination.
Westbound Jet Lag
jet lag
Westbound travel is the easier direction for circadian recovery — your body is being asked to STAY UP later than its current phase wants, which aligns with the natural human tendency to drift later (the internal clock has a natural period slightly longer than 24 hours). Most people adapt to westbound travel in roughly half the time of equivalent eastbound jet lag. This protocol uses melatonin timed for PHASE DELAY (staying up later) and supports the difficult parts: fighting drowsiness in the destination evening when your body wants to sleep, and falling asleep later than your home schedule once you''re ready. For eastbound travel (the harder direction), see Eastbound Jet Lag (5+ zones) — different protocol with different melatonin timing.
Kids Sleep Support
kids
Sleep problems affect 25-40% of children at some point — difficulty falling asleep, frequent night wakings, early morning waking, or behavioral resistance at bedtime. The overwhelming majority of these are BEHAVIORAL in origin: inconsistent bedtimes, screen exposure before bed, inadequate wind-down routine, parental management patterns that reinforce wakings, or simple mismatch between bedtime and the child''s circadian biology. Behavioral interventions — consistent routine, sleep hygiene, age-appropriate sleep training — outperform supplements dramatically. Skipping the behavioral work and reaching for melatonin almost always under-treats the actual problem. This protocol is a LAST RESORT for kids 4+ where sleep environment and behavioral plans have already been tried, ideally with pediatric oversight. Before adding any supplement, sleep-disrupting medical conditions must be ruled out — particularly obstructive sleep apnea (snoring, mouth breathing, restless sleep with adequate sleep duration but daytime sleepiness), restless leg syndrome (often iron-deficient), and behavioral insomnia. Melatonin in children is increasingly controversial: the AAP and AASM advise caution, pediatric melatonin ingestion calls to US poison control rose 530% from 2012-2021, and most "kids melatonin" products are dramatically over-dosed (3-10 mg) relative to the 0.3-1 mg that the pediatric trial evidence actually supports. Talk to your pediatrician before starting ANY sleep supplement in a child.
Shift Worker / Night Owl
sleep
Shift workers and natural night-owls face a fundamental conflict: their work schedule misaligns with their circadian biology. Long-term shift work is associated with elevated cardiovascular, metabolic, and cancer risk. This stack supports circadian phase-shifting and sleep quality when sleeping during atypical hours: timed melatonin to signal "night" to the brain when sleeping in daylight, magnesium glycinate for nervous system relaxation, L-theanine for wind-down regardless of clock time, and ashwagandha for the chronic cortisol stress shift work imposes.
Food sources
| Food | Amount | %DV |
|---|---|---|
| Tart cherries (Montmorency) | 1 cup | — |
| Pistachios | 1 oz | — |
| Walnuts | 1 oz | — |
| Eggs | 2 large | — |
| Milk (especially nighttime-milked) | 1 cup | — |
| Salmon | 3 oz | — |
Tart cherries (Montmorency)
- Amount
- 1 cup
- %DV
- —
Pistachios
- Amount
- 1 oz
- %DV
- —
Walnuts
- Amount
- 1 oz
- %DV
- —
Eggs
- Amount
- 2 large
- %DV
- —
Milk (especially nighttime-milked)
- Amount
- 1 cup
- %DV
- —
Salmon
- Amount
- 3 oz
- %DV
- —
Choosing a product
What to look for on the label — and what to be skeptical of.
Look for…
Be skeptical of…
Frequently asked questions
How much melatonin should I take?⌄
Start with the lowest effective dose, often 0.3 to 1 mg, taken 30 to 60 minutes before bed. Higher doses are not necessarily better and may increase morning grogginess.
Is melatonin habit-forming?⌄
Melatonin is not considered physically addictive and does not appear to cause tolerance or withdrawal in most studies. However, psychological reliance can develop, and using it nightly long-term has not been thoroughly studied.
Can I take melatonin every night?⌄
Long-term nightly use has limited safety data. For short-term issues like jet lag or temporary insomnia, melatonin is generally considered safe. For chronic sleep problems, consult a clinician to address underlying causes.
Will melatonin make me sleep through the night?⌄
Melatonin primarily helps with falling asleep rather than staying asleep. Extended-release formulations may help with sleep maintenance, especially in older adults whose endogenous melatonin is reduced.
Can children take melatonin?⌄
Pediatric use should be supervised by a clinician. Behavioral sleep approaches are typically the first line. Melatonin can be appropriate for children with ADHD or autism who have sleep difficulties, but doses should be conservative.
References by claim
Track Melatonin with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.