Melatonin for sleep: what the evidence says
For chronic insomnia, the NIH's National Center for Complementary and Integrative Health says there is not enough strong evidence on the effectiveness or safety of melatonin supplements for guidelines to recommend them. [1] Melatonin is sold in the US as a dietary supplement, which is regulated less strictly than a drug, and a 2023 study found 22 of 25 gummy products inaccurately labeled. [1] Whether to use it is a decision for you and your clinician.
What is melatonin?
Melatonin is a hormone your brain produces in response to darkness. It helps with the timing of your circadian rhythms, your 24-hour internal clock, and with sleep. [1] Being exposed to light at night can block melatonin production. [1] The supplements are most often made synthetically. [1]
Does melatonin work for chronic insomnia?
NCCIH, part of the National Institutes of Health, reports that practice guidelines from the American Academy of Sleep Medicine (2017) and the American College of Physicians (2016) found there is not enough strong evidence on the effectiveness or safety of melatonin for chronic insomnia to recommend its use. [1] Chronic insomnia means trouble falling asleep, staying asleep, or both, lasting a month or longer by the NCCIH's definition. [1] The same page notes that the ACP guideline strongly recommends cognitive behavioral therapy for insomnia (CBT-I) as an initial treatment. [1] Our article on asking for CBT-I covers that route.
Does the label match what is in the bottle?
Melatonin is regulated as a dietary supplement in the US, which means it is regulated less strictly by the FDA than a prescription or over-the-counter drug. [1] A 2023 study cited by NCCIH found that 22 out of 25 over-the-counter melatonin gummy products were inaccurately labeled. [1] One product did not contain detectable melatonin. In the rest, the amount ranged from 74 to 347 percent of the labeled quantity. [1] NCCIH's general advice is to read and follow label instructions, and to remember that "natural" does not always mean "safe." [1]
Does melatonin have any better-supported uses?
Yes, for different problems. NCCIH says research suggests melatonin supplements may help with jet lag, and lists jet lag, delayed sleep-wake phase disorder, some sleep disorders in children and anxiety before and after surgery among the conditions it has been studied for. [1] The evidence for those is separate from the evidence for chronic insomnia in adults, which is what most midlife readers are asking about. [1]
Is melatonin safe?
NCCIH says there is not enough information about possible side effects, particularly at doses higher than the body normally produces, to give a clear picture of overall safety. [1] Short-term use appears to be safe for most people, but information on long-term safety is lacking. [1] People taking medicine should consult their health care providers first, and people with epilepsy or those taking blood thinners need to be under medical supervision. [1] NCCIH also notes a possible risk of allergic reactions and a lack of research on use in pregnant or breastfeeding women. [1] For older people, it says melatonin may stay active longer and cause daytime drowsiness, and it reports that the AASM recommends against melatonin use by people with dementia. [1]
The National Institute on Aging says some women with sleep trouble during the menopausal transition use over-the-counter sleep aids such as melatonin, and others use prescription medicines, which may help for a short time. [2] It adds that these are not a cure for sleep disturbances such as insomnia and should not be used long term. [2]
What to ask your clinician or pharmacist
Whether melatonin could interact with any medicine you take, especially if you have epilepsy or take a blood thinner. [1] Whether it is right for you at all, given that guidelines found insufficient evidence for chronic insomnia. [1] Whether CBT-I is available to you, since the ACP recommends it as the initial treatment. [5] And how long, if at all, any sleep aid should be used. [2]
Why is melatonin a household safety issue?
Gummies look like candy. A CDC report estimated 10,930 emergency department visits for melatonin ingestion by infants and children aged 5 and younger in the US from 2019 to 2022 (95% confidence interval 7,609 to 14,251), accounting for 7.1% of all emergency visits for unsupervised medication exposures in that age group. [3] NCCIH says the report emphasized keeping medications and supplements out of children's reach and sight. [1] If there are children in your home, store melatonin the way you would any medicine.
When to talk to your clinician
If you have been struggling with sleep for a month or longer, that is a conversation worth having rather than a supplement worth guessing at. [1] Hot flashes at night, a need to urinate, sleep apnea and insomnia are all on the list of things that can break up midlife sleep, and each has a different answer. [4]
Sources
- National Center for Complementary and Integrative Health (NIH), Melatonin: What You Need To Know. Last updated May 2024. Retrieved 2026-10-18.
- National Institute on Aging, Sleep Problems and Menopause: What Can I Do? Content reviewed September 30, 2021. Retrieved 2026-10-18.
- CDC, Morbidity and Mortality Weekly Report 73(9), emergency department visits for melatonin ingestion by young children. Published March 7, 2024. Retrieved 2026-10-18.
- Office on Women's Health, Menopause symptoms and relief. Page last updated May 30, 2025. Retrieved 2026-10-18.
- Qaseem et al., American College of Physicians guideline on chronic insomnia disorder, Ann Intern Med 2016. PMID 27136449. Retrieved 2026-10-18.
Every statement above was checked against the linked source on October 18, 2026. This article is education, not individual medical advice. Related: Magnesium for sleep, Perimenopause supplements, the 7-Day Midlife Sleep Reset.