What Is Melatonin? Sleep Benefits and What Research Says About Its Use

Melatonin is a hormone naturally produced by the body that plays an important role in regulating the circadian rhythm and the sleep-wake cycle. Its levels typically rise after darkness falls, while exposure to light at night can suppress its production. Melatonin has also become a common ingredient in supplements and products associated with sleep.

However, its popularity does not mean that melatonin is a universal solution for sleep problems. Scientific evidence varies depending on the condition being studied, while timing, dosage, and individual health factors may influence the results. It is therefore important to distinguish between the natural role of melatonin in the body and the effects of taking melatonin from an external source.

What Is Melatonin?

Melatonin is a hormone produced by the brain in response to darkness, primarily by the pineal gland. It helps regulate the body's internal biological clock, known as the circadian rhythm, and plays a role in coordinating the sleep-wake cycle.

Melatonin production is influenced by light and darkness. Blood levels generally begin to rise in the evening, remain elevated during the night, and decline toward morning. Exposure to bright artificial light late in the evening can interfere with this process.

It is important to distinguish between melatonin naturally produced by the body and products containing externally administered melatonin. The effectiveness and safety of these products depend on their formulation, timing, dosage, and intended use.

How Does Melatonin Affect Sleep and the Circadian Rhythm?

Sleep is not controlled by melatonin alone. The body's internal biological clock and the increasing need for sleep during wakefulness work together to influence when we feel sleepy and alert.

Light and darkness provide important signals to the circadian system. As darkness approaches, melatonin production increases, helping the body prepare for the biological night. Light exposure, particularly at inappropriate times, can reduce melatonin production.

For this reason, describing melatonin simply as a "sleep hormone" may be an oversimplification. Its primary physiological role includes signaling darkness and helping synchronize the body's internal rhythms with the external day-night cycle.

What Melatonin Benefits for Sleep Are Supported by Research?

The strength of scientific evidence differs depending on the sleep-related condition. Insomnia, circadian rhythm disorders, jet lag, and shift-work sleep problems should not be treated as though they all respond to melatonin in the same way.

1. Melatonin and Falling Asleep

Some studies suggest that melatonin may help reduce sleep-onset latency, which is the time it takes a person to fall asleep.

According to the National Center for Complementary and Integrative Health (NCCIH), melatonin may improve sleep-onset latency and certain measures of daytime sleepiness in some people with insomnia. However, this does not necessarily mean that all aspects of sleep improve.

A 2024 systematic review and dose-response meta-analysis involving 26 randomized, double-blind trials and 1,689 observations found that melatonin administration was associated with changes in sleep-onset latency and total sleep time. The analysis also indicated that timing and dosage were associated with differences in outcomes.

These findings should not be interpreted as establishing one ideal dose or administration time for everyone.

2. Melatonin and Insomnia

Despite melatonin's popularity for sleep problems, the evidence surrounding insomnia is more complex than the claim that it simply "treats insomnia."

According to NCCIH's review of sleep disorders and complementary approaches, a research review involving 12 studies and 2,666 participants found improvements in sleep-onset latency and daytime sleepiness among people with insomnia, but not in sleep quality or time spent awake during the night.

A separate 2022 systematic review and meta-analysis found no clear improvement in sleep-onset latency, total sleep time, or sleep efficiency among adults with chronic insomnia without other associated conditions.

For this reason, melatonin should not be presented as an established treatment for chronic insomnia. NCCIH also notes that previous clinical guidelines from sleep medicine organizations did not recommend melatonin for chronic insomnia because of insufficient evidence.

3. Melatonin and Jet Lag

Jet lag occurs when someone travels rapidly across time zones and the body's internal clock has not yet adjusted to the new local time.

In this area, the evidence supporting melatonin is relatively stronger.

According to NCCIH, a review of 10 studies involving 994 participants found that melatonin may help reduce jet lag symptoms after eastward or westward travel.

This potential benefit is related to melatonin's role in circadian timing, rather than simply making a person feel sleepy.

4. Melatonin and Shift Work

Working at night and sleeping during the day can create a mismatch between a person's schedule and their natural circadian rhythm.

Some research suggests that melatonin may help with certain sleep problems associated with shift work, although the findings are not consistent across studies.

NCCIH reports that a 2022 review involving 10 studies and 318 participants suggested potential benefits for shift-work-related sleep problems.

However, other reviews have reported limited or inconclusive findings. Therefore, melatonin should not be assumed to resolve shift-work sleep difficulties for everyone.

When Should Melatonin Be Taken?

There is no single administration time that is appropriate for everyone.

Because melatonin interacts with the circadian system, timing may be part of its effect, rather than merely a secondary consideration.

The 2024 dose-response meta-analysis found that the timing of melatonin administration relative to bedtime was associated with sleep-onset outcomes. The time of administration during the day was also associated with differences in total sleep time.

However, this does not mean that one timing recommendation from a clinical study can be applied to every product and individual.

The intended use may differ between someone dealing with jet lag, a person experiencing circadian timing difficulties, and someone using a specific melatonin-containing formulation.

Consumers should therefore follow the directions provided for their particular product and avoid changing the timing or dose based solely on research involving different preparations or populations.

What Is the Appropriate Melatonin Dosage?

There is no single melatonin dose that can be considered ideal for every person or every use.

Clinical studies have investigated different dosages, administration times, formulations, and sleep-related conditions.

This variation is also reflected in products registered in Saudi Arabia, where the Saudi Food and Drug Authority (SFDA) lists melatonin products with different strengths and dosage forms.

Therefore, a dose used in one clinical trial should not automatically become a general recommendation. A higher dose does not necessarily mean a better result.

When using a melatonin-containing product, consumers should follow its specific instructions and safety warnings and consult a doctor or pharmacist when they have a medical condition or take other medications.

Is Melatonin Safe?

According to official health sources, melatonin appears to be relatively safe for many people during short-term use, but information about its long-term safety remains insufficient.

The NCCIH melatonin fact sheet discusses potential side effects and limitations in the available long-term safety evidence.

Reported side effects may include:

1. Drowsiness.
2. Headache.
3. Dizziness.
4. Nausea.

The likelihood of side effects may vary depending on the individual, dosage, formulation, and other medications being used.

2026 Safety Update From the Saudi Food and Drug Authority

On April 19, 2026, the Saudi Food and Drug Authority (SFDA) published a safety signal concerning a potential association between melatonin use and cardiac failure, based on pharmacovigilance activities, case reports, and a review of available evidence.

Importantly, the SFDA explains that a safety signal is preliminary and unconfirmed by nature. It does not establish that melatonin causes heart failure.

The authority advised healthcare professionals and regulatory stakeholders to remain aware of the potential signal.

Therefore, this finding should not be presented as proof that melatonin causes cardiac failure. However, it represents relevant safety information that should be considered when evaluating melatonin use.

Read the SFDA safety signal report (PDF).

Who Should Be Cautious About Using Melatonin?

Melatonin may interact with certain medications, and some medical conditions require additional caution.

According to NCCIH, medical supervision is particularly important for people with epilepsy and those taking blood-thinning medications.

People who regularly take medications should also discuss melatonin-containing supplements with a healthcare professional before using them.

Children and adolescents require particular consideration. U.S. health authorities have reported increasing incidents of unsupervised melatonin ingestion among children, including cases requiring emergency medical attention.

For this reason, the availability of melatonin products should not be interpreted as evidence that they are automatically appropriate for every person or age group.

Can Melatonin Be Taken Every Day?

The answer depends on the duration of use, the person's health, the product, and the reason for taking it.

There is more evidence concerning short-term use, while NCCIH emphasizes that the long-term safety of melatonin has not been adequately established.

Therefore, daily long-term use should not automatically be assumed to be safe simply because melatonin is a hormone naturally produced by the body.

Persistent sleep difficulties may also require evaluation of their underlying causes rather than continued reliance on a sleep-related product.

Melatonin in BeCalme

Melatonin is one of the ingredients in VITADIET BeCalme, alongside ashwagandha, magnesium, Melissa herb, hops cones, vitamins B1 and B6, and other ingredients.

According to product information provided by VITADIET, the formulation contains 1 mg of melatonin.

It is important not to transfer the results of studies investigating melatonin alone directly to BeCalme. The product contains multiple ingredients, while clinical studies vary in dosage, formulation, and participant characteristics.

Similarly, the presence of melatonin in the formulation does not mean that BeCalme treats insomnia or other sleep disorders.

You can also read our article on Ashwagandha Benefits: What Does the Research Say About Stress and Sleep? to learn more about another ingredient found in the BeCalme formulation.

Learn more about BeCalme to explore its formulation, product information, directions for use, warnings, and available purchase options.

Health notice: This article is intended for general health education and should not be used to diagnose or treat sleep disorders or any medical condition. Consult a doctor or pharmacist if sleep problems persist, you have a medical condition, take medications, or are unsure whether a melatonin-containing product is appropriate for you.

Frequently Asked Questions About Melatonin

Is melatonin a sleeping pill?

Melatonin is not simply a conventional sleeping medication. It is a hormone involved in regulating the circadian rhythm and sleep-wake cycle. Melatonin supplements may help with certain sleep-related problems or circadian timing difficulties, but their effects vary depending on the condition, timing, and method of use.

How long does melatonin take to work?

There is no single timeframe that applies to every person and product. Its effects depend on administration timing, dosage, formulation, and intended use. Research has shown that the timing of melatonin administration can influence sleep-related outcomes.

Can melatonin be taken every day?

More information is available about the safety of short-term use, while evidence concerning long-term safety remains insufficient. Therefore, daily use over extended periods should not automatically be considered appropriate for everyone, particularly those with medical conditions or taking medications.

Does melatonin treat insomnia?

Melatonin should not be considered an established treatment for chronic insomnia. Some studies have found improvements in the time needed to fall asleep, but these findings do not extend to every aspect of insomnia. Clinical guidelines referenced by NCCIH have not recommended melatonin for chronic insomnia because of insufficient evidence.

Sources and References

1. National Center for Complementary and Integrative Health (NCCIH). Melatonin: What You Need To Know.
2. https://www.nccih.nih.gov/health/melatonin-what-you-need-to-know
3. National Center for Complementary and Integrative Health (NCCIH). Sleep Disorders and Complementary Health Approaches: Usefulness and Safety.
4. https://www.nccih.nih.gov/health/sleep-disorders-and-complementary-health-approaches
5. National Institutes of Health (NIH). Healthy Sleep.
6. https://health.nih.gov/health-topics-a-z/healthy-sleep
7. National Heart, Lung, and Blood Institute (NHLBI). How Sleep Works – Your Sleep/Wake Cycle.
8. https://www.nhlbi.nih.gov/health/sleep/sleep-wake-cycle
9. López-Muñoz F, et al. Optimizing the Time and Dose of Melatonin as a Sleep-Promoting Drug: A Systematic Review of Randomized Controlled Trials and Dose-Response Meta-Analysis. 2024. PMID: 38888087.
10. https://pubmed.ncbi.nlm.nih.gov/38888087/
11. Saudi Food and Drug Authority (SFDA). Safety Signal of Melatonin and the Risk of Cardiac Failure. Published April 19, 2026.
12. https://www.sfda.gov.sa/sites/default/files/2026-04/Safety%20Signal%20of%20MELATONIN%20and%20the%20Risk%20of%20Cardiac%20failure.pdf
13. Saudi Food and Drug Authority (SFDA). Herbal Drugs Database – Melatonin Registered Products.
14. https://sfda.gov.sa/en/herbal-drugs?tradeName=melatonin
15. VITADIET. VITADIET 2026 Product Catalogue – BeCalme Product Information and Ingredients.