Melatonin

What is Melatonin?

Melatonin is a hormone naturally produced by the pineal gland in the brain, primarily in response to darkness. It helps regulate the body’s circadian rhythm—your internal 24-hour clock that influences sleep, wakefulness, body temperature, and many other biological processes. Light exposure—especially blue light—suppresses melatonin production, while darkness stimulates it, signaling to the body that it is time to prepare for sleep.

As a supplement, melatonin is a non-essential compound rather than a vitamin or mineral. The body does not technically require supplemental melatonin the way it requires essential nutrients. Most supplemental melatonin is synthesized in a lab, though “phytomelatonin” (plant-derived melatonin) and animal-derived forms have existed historically. It is commonly used as a dietary supplement to help with sleep timing, jet lag, and certain circadian rhythm disorders, and it may have additional roles in neurological conditions and antioxidant defense. Because it is a hormone with systemic effects, thoughtful use and proper timing are important.

Benefits of Melatonin

Jet lag mitigation (Strong evidence) Melatonin taken close to the local bedtime at the destination can reduce symptoms of jet lag, especially after crossing five or more time zones. Trials show it helps realign the circadian rhythm more quickly, improving sleep, alertness, and daytime function during travel adaptation. Appropriate timing relative to light exposure (seeking morning light after eastward travel, avoiding late-evening bright light) enhances the benefit.
Delayed Sleep–Wake Phase Disorder (DSWPD) and circadian phase adjustment (Strong evidence) Melatonin can advance the sleep phase in people whose natural tendency is to fall asleep and wake up much later than desired. Low, early-evening doses—paired with morning bright light—can shift the biological clock earlier and improve sleep timing and next-day function. Consistent timing and dose are key, and professional guidance helps optimize protocols.
Sleep onset latency and sleep quality in insomnia (Moderate evidence) Meta-analyses suggest melatonin can modestly reduce the time it takes to fall asleep and may slightly increase total sleep time, with generally favorable tolerability. Effects are most pronounced for sleep onset rather than sleep maintenance. Benefits vary by individual, with better results when combined with sleep hygiene and light management.
REM Sleep Behavior Disorder (RBD) (Moderate evidence) In people with RBD—often associated with Parkinson’s disease—melatonin has been shown in controlled trials and clinical series to reduce dream enactment behaviors and improve sleep safety. Extended-release formulations may be particularly helpful for nighttime symptoms. Clinician oversight is recommended due to comorbidities and medications.
Preoperative anxiety and sedation support (Moderate evidence) Studies indicate melatonin can reduce preoperative anxiety and provide mild sedation without notable respiratory depression. It may be a useful adjunct before certain procedures under medical direction. Dosing and timing are procedure-specific, and patients should follow their surgical team’s guidance.
Headache and migraine prevention (Moderate evidence) Some randomized trials report fewer monthly migraine days with nightly melatonin compared with placebo, with tolerability advantages relative to certain prescription options. Results are not uniform across all studies, and optimal dosing/formulation is still being clarified. Individuals should consult a healthcare professional for personalized management.
Nocturnal blood pressure and cardiometabolic markers (Mixed evidence) Extended-release melatonin has lowered nighttime blood pressure in some trials, but findings are inconsistent. Melatonin may also influence glucose tolerance and metabolic rhythms, making medical oversight prudent for people with diabetes, hypertension, or those on related medications.

Types or Forms Available

Immediate-release (IR) tablets, capsules, or liquids: Absorbed quickly, best for sleep onset or when you want a rapid rise in levels (e.g., jet lag at bedtime). Food can slow absorption; some people prefer sublingual IR for faster onset.
Extended-release (ER) or prolonged-release formulations: Designed to release melatonin gradually through the night, which may help with sleep maintenance or conditions like RBD. ER products vary by matrix and release profile; consistency can differ among brands.
Sublingual tablets or oral sprays: Dissolve or absorb under the tongue, aiming for faster uptake. Useful when rapid onset is desired or for travelers seeking convenience. Taste and sweeteners vary.
Low-dose “micro” formulations (100–500 mcg): Helpful for circadian phase shifting with fewer next-day effects in sensitive users. Small doses can be effective for timing the body clock without excessive sedation.
Gummies and chewables: Palatable options that can be convenient, but they often have variable actual content and added sugars. Independent testing is especially important.
Plant-derived “phytomelatonin” and synthetic melatonin: Most products are synthetic and vegan. Phytomelatonin is marketed as “natural,” but functional effects are similar when dosing is accurate. Historically, animal-sourced melatonin existed but is uncommon now due to safety and ethical concerns.
Combination formulas: Melatonin is often paired with magnesium, theanine, or calming botanicals. Be cautious with products combining serotonergic ingredients (e.g., 5-HTP) if you use antidepressants or other serotonergic medications.

How to Use Melatonin

Melatonin is most effective when timing matches your goal. For sleep onset, it’s typically taken shortly before the target bedtime; for circadian phase shifting (e.g., DSWPD or jet lag), timing may shift earlier or later and should be paired with strategic light exposure. Start with the lowest effective dose and adjust gradually if needed.

Common dosage range: 0.3–1 mg for circadian timing or sensitive users; 1–3 mg about 30–60 minutes before bedtime for sleep onset; occasionally up to 5 mg for short-term use in adults. For jet lag, 0.5–5 mg near local bedtime at the destination for a few nights can help. Higher doses are not necessarily more effective and may increase side effects; avoid megadoses.
Best timing: For sleep initiation, 30–60 minutes before bed. For advancing the sleep phase (earlier sleep/wake), smaller doses taken in the early evening can help. For eastward travel, take at local bedtime; for westward travel, use near bedtime as needed. Pair with bright light in the morning and reduce bright light exposure late evening.
How to take it: Swallow with water. Taking on an empty stomach may lead to faster absorption; a small snack is usually fine if you experience stomach upset. Avoid alcohol and other sedatives near dosing.
Consistency: For jet lag or shift transitions, use short-term. For chronic circadian disorders, consistent daily timing may be needed under guidance. For occasional insomnia, use as needed while prioritizing sleep hygiene. Long-term nightly use should be periodically reassessed with a healthcare professional.

Food Sources and Supplement Options

Melatonin is present in certain plant foods and in animal products, but amounts are generally small and variable compared with supplement doses. Diet can support overall circadian health, but food alone usually cannot match the timing and potency of supplemental melatonin when a specific sleep or travel goal is targeted.

Tart cherries and tart cherry juice
Pistachios and walnuts
Grapes, tomatoes, strawberries
Mushrooms and some grains/legumes
Milk (especially “night milk” from evening-milked cows, not commonly available)

Supplements provide standardized, predictable dosing that can be timed precisely for sleep onset or circadian shifting. They may make sense for short-term jet lag, shift work transitions, circadian rhythm disorders, or when behavioral strategies alone are insufficient. Whole foods, however, offer a host of additional nutrients and phytonutrients that support overall health, so a food-first approach remains valuable alongside targeted supplementation when needed.

Who May Benefit from Melatonin?

Travelers crossing multiple time zones who want to reduce jet lag and adjust sleep timing faster.
People with Delayed Sleep–Wake Phase Disorder or chronic sleep schedule drift who need to shift sleep earlier.
Adults with difficulty falling asleep who prefer a non-sedative option alongside sleep hygiene and light management.
Individuals with REM Sleep Behavior Disorder, particularly in neurodegenerative conditions, under clinician guidance.
Shift workers attempting to transition between day and night schedules, when combined with strategic light exposure and behavioral strategies.
Some individuals with frequent migraines seeking adjunct prevention strategies, in consultation with a healthcare professional.
Older adults who produce less endogenous melatonin and who have difficulty with sleep initiation, starting at low doses.

Side Effects and Considerations

Common side effects: Daytime sleepiness, dizziness, headache, nausea, vivid dreams, and grogginess—more likely at higher doses or with extended-release forms.
Hormonal considerations: Melatonin is a hormone. People who are pregnant, trying to conceive, or breastfeeding should consult a healthcare professional before use. Children and adolescents should use melatonin only under pediatric guidance due to limited long-term data and potential effects on puberty timing.
Medication interactions: May enhance sedation with sleep medications, benzodiazepines, or alcohol. Fluvoxamine and some other CYP1A2 inhibitors can markedly raise melatonin levels; oral contraceptives may also increase levels. It may interact with anticoagulants/antiplatelets, antihypertensives, diabetes medications, and immunosuppressants; consult your clinician if on these therapies.
Metabolic effects: Melatonin can influence glucose tolerance and insulin secretion; people with diabetes or metabolic syndrome should monitor closely and discuss dosing and timing with a healthcare professional.
Immune and autoimmune conditions: Melatonin has immunomodulatory activity. Individuals with autoimmune disease or those on immunosuppressive therapy should seek medical advice before use.
Liver or kidney concerns: Melatonin is primarily metabolized in the liver. Those with hepatic or renal impairment should use lower doses and medical supervision.
Driving and safety-critical tasks: Avoid driving or operating machinery for at least 4–5 hours after taking melatonin because of residual drowsiness risk.
Surgery and procedures: Discuss melatonin use with your surgical team. Some clinicians advise pausing melatonin 1–2 weeks before elective surgery due to potential interactions with anesthetics and bleeding risk, while others may allow it; follow individualized medical advice.
Quality and dosing accuracy: Independent testing has shown variable content in some melatonin products, especially gummies. Choose third-party tested brands (e.g., USP, NSF) to improve label accuracy and screen for contaminants.
Allergies and additives: Check labels for dyes, sweeteners, or excipients that may not agree with you. Most melatonin is vegan, but confirm if you have dietary restrictions.
General caution: Anyone who is pregnant, breastfeeding, taking medications, or managing a medical condition should consult a healthcare professional before starting melatonin.

Common Myths About Melatonin

Myth: Melatonin is a sleeping pill that “knocks you out.” Melatonin does not sedate like prescription hypnotics. It acts as a timing signal for the circadian clock, helping your body prepare for sleep. Many people feel only mildly drowsy; benefits are greatest when timing and light exposure are optimized.
Myth: More melatonin works better. Higher doses often add side effects without better sleep. For circadian shifting, very low doses can be as effective—or more appropriate—than larger ones. Start low, match the dosing time to your goal, and titrate cautiously if needed.
Myth: Because it’s “natural,” it’s safe for everyone long-term. Melatonin is a hormone with potential interactions and special considerations for pregnancy, breastfeeding, children, and people on certain medications. Long-term nightly use should be periodically reassessed with a healthcare professional.
Myth: Eating melatonin-rich foods can fully replace supplements for jet lag. Foods contain small, variable amounts of melatonin—beneficial for general wellness but typically insufficient to produce the targeted circadian shifts achieved with timed supplemental dosing.

Conclusion

Melatonin can be a helpful, well-tolerated tool for improving sleep timing, reducing jet lag, and addressing specific circadian rhythm disorders. It may also support certain neurological and headache conditions. Its effectiveness depends heavily on correct timing, appropriate dosing, and coordination with light exposure and good sleep hygiene. Quality matters—choose reputable, third-party tested products and avoid assuming that higher doses are better.

Because melatonin is a hormone with potential interactions and special considerations, individuals who are pregnant, breastfeeding, taking medications, or managing medical conditions should consult a healthcare professional. A food-first approach supports overall health, while supplements provide precise, short-term or targeted dosing when needed. Used thoughtfully and safely, melatonin can complement behavioral strategies to improve sleep and circadian health.