Quick answer
NIH's lactation database says no data exist on the safety of maternal melatonin during breastfeeding, but that short-term evening use of usual amounts is unlikely to harm a breastfed infant, although some authors advise against it. NCCIH says research is lacking. Ask your doctor before using melatonin.1,2
Key facts
- NIH's Drugs and Lactation Database says no data exist on the safety of maternal melatonin use during breastfeeding.1
- It also says doses higher than those expected in breast milk after maternal supplements have been used in infants, and that short-term evening use of usual doses is unlikely to harm a breastfed infant.1
- Some authors recommend against it during breastfeeding because of the lack of data and a long half-life in preterm newborns.1
- Melatonin is a normal component of breast milk, at higher levels at night than by day.1
- NCCIH says there has been a lack of research on melatonin use in pregnant or breastfeeding women.2
What does NIH's Drugs and Lactation Database say about melatonin?
LactMed starts with what is missing: melatonin has no specific use during breastfeeding, and no data exist on the safety of a mother's melatonin use while she nurses. It then reasons from related evidence. Doses higher than the ones expected in breast milk after maternal supplements have been used in infants without reported harm, the entry says, and it judges it unlikely that short-term evening use of usual doses by a nursing mother would adversely affect her baby.1
The entry adds a counterweight. Some authors advise against melatonin during breastfeeding, because of the lack of data and a relatively long half-life in preterm newborns. That is a reason for care with a premature baby, not a harm that was observed.1
Is melatonin already in breast milk?
Yes. LactMed describes melatonin as a normal component of breast milk, with higher levels in colostrum than in mature milk and higher levels at night than by day, peaking around midnight to 3 a.m. It reports that women who work night shifts have lower milk melatonin during the night than on days when they are not working.1
Some authors suggest nursing in the dark at night, to avoid reductions in the melatonin content of milk that could disturb an infant's sleep pattern. A survey of 329 mothers found that infants who were fed expressed milk from the wrong time of day took longer to get to sleep than infants fed directly from the breast. These findings are about the body's own melatonin, not about supplements, but they explain why the topic gets attention.1
What do NCCIH and other reviews add?
NCCIH says there has been a lack of research on melatonin use in pregnant or breastfeeding women and that a nursing parent should see a health care provider before taking it. A 2022 scoping review found seven human studies on melatonin and breastfeeding, none of them a randomized trial of melatonin for sleep problems.2,3
Gummies need a second look. NCCIH reports that most of the melatonin gummies in one study were inaccurately labeled, so a parent cannot be sure how much she is taking.2
In a 2023 study, 22 of 25 melatonin gummy products were inaccurately labeled. One had no detectable melatonin, and the rest held 74 to 347 percent of the amount on the label.2,4
Who should ask a doctor about melatonin while breastfeeding?
Ask your doctor or a lactation consultant before using melatonin if you are breastfeeding or pumping. If your baby was born early, say so, because the entry singles out preterm newborns.
- Bring the label and mention any other sleep aid you use, since many combine ingredients that make a person drowsy.2
- Ask whether a plan to use it for more than a few days changes the answer, since the entry speaks only of short-term evening use.
- Ask your baby's pediatrician about it if you have already used it, since the entry does not describe signs to watch for.
Questions people ask
Is melatonin safe while breastfeeding on Reddit?
Online answers are not a source. NIH's lactation database says no data exist on maternal use during breastfeeding, and NCCIH says research is lacking. Ask your doctor.1,2
Is melatonin bad while breastfeeding?
NIH's lactation database judges short-term evening use of usual doses unlikely to adversely affect a breastfed infant, but says no data exist and notes that some authors advise against it. Ask your doctor.1
Is melatonin OK when breastfeeding?
The database does not give a clear yes or no. It reports no data on safety, reasoning from the amounts expected in milk, and notes that some authors recommend against use.1
Are melatonin gummies safe while breastfeeding?
The sources do not treat gummies differently, but NCCIH reports that most gummies in one study were inaccurately labeled, so the amount in a gummy may differ from the label. Ask your doctor.2
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Sources
- Melatonin. In: Drugs and Lactation Database (LactMed). Bethesda (MD): National Institute of Child Health and Human Development; 2006 onward. Updated April 15, 2026. Read as its summary of use during lactation, indexed in PubMed as PMID 30000923. Opened 2026-10-11.
- National Center for Complementary and Integrative Health. Melatonin: What You Need To Know. Bethesda (MD): National Institutes of Health. Last updated May 2024. Opened 2026-10-07.
- Vine T, Brown GM, Frey BN. Melatonin use during pregnancy and lactation: a scoping review of human studies. Braz J Psychiatry. 2022;44(3):342-348. Opened 2026-10-11.
- Cohen PA, Avula B, Wang YH, Katragunta K, Khan I. Quantity of melatonin and CBD in melatonin gummies sold in the US. JAMA. 2023;329(16):1401-1402. PMCID: PMC10130950. Opened 2026-10-01.
This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.