Melatonin During Pregnancy: Common Questions
What current human evidence says about melatonin supplements in pregnancy, sleep treatment alternatives, and breastfeeding.
Melatonin in pregnancy isn’t advised at this time — we don’t know how the medication will impact fetal development or brain function.
Dr. Kecia Gaither: Pregnant and Can't Sleep? Melatonin Isn't the Way to Go Read the original source
The short answer: Melatonin supplements have not been well studied as a treatment for insomnia during pregnancy. A small number of human studies have looked at other uses, but they cannot establish the safety or benefit of routine use for sleep. Discuss any supplement you take or are considering with your prenatal clinician. MotherToBaby's updated melatonin fact sheet and the NIH National Center for Complementary and Integrative Health (NCCIH) both emphasize the limits of the evidence.
What is melatonin?
Melatonin is a hormone involved in the body's sleep-wake cycle. The body naturally makes melatonin during pregnancy; a supplement adds to that natural exposure. A hormone being naturally present does not establish that a supplement is safe at any particular dose. MotherToBaby explains this distinction.
Is taking melatonin during pregnancy known to be safe?
No firm conclusion is possible from the available research. A review of human pregnancy and breastfeeding studies found no randomized trials that tested melatonin for sleep disorders in these groups. Some small studies used melatonin for other reasons. Their findings do not answer whether an over-the-counter product taken for insomnia is safe throughout pregnancy.
What about birth defects or miscarriage?
MotherToBaby says the few human studies involving melatonin have not suggested an increased chance of birth defects, but the overall evidence is too limited to rule out a risk. It also reports that studies of melatonin used in infertility treatment did not show an increased miscarriage chance. Those studies do not measure the risk of routine supplement use for pregnancy insomnia. If you have already taken melatonin, share the product, dose, timing, and reason with your prenatal clinician rather than drawing a conclusion from a single study.
Does melatonin help pregnancy insomnia?
The human-study review found that insomnia was not the primary outcome in the pregnancy studies it identified. We therefore do not have good trial evidence that melatonin reliably treats insomnia during pregnancy. The NCCIH overview also notes that evidence is insufficient to recommend melatonin for chronic insomnia in adults generally.
What can I discuss instead?
Cognitive behavioral therapy for insomnia (CBT-I) is a structured, non-drug treatment. A randomized trial in pregnant participants found that digital CBT-I improved insomnia symptoms and sleep quality compared with sleep education. Ask your care team whether CBT-I is available and whether pain, reflux, restless legs, anxiety, or another treatable problem is affecting sleep. If you drink coffee or tea, our caffeine guide explains how to count amounts across products. A clinician can help weigh other options if symptoms continue.
Do supplement labels and other medicines matter?
Yes. Melatonin is regulated as a dietary supplement in the United States. NCCIH reports that some products have contained amounts different from their labels, and it advises people taking medicines to ask a health professional about interactions. Do not combine sleep products or change prescribed medicines based on an article.
What about breastfeeding?
Melatonin is naturally present in breast milk, but taking melatonin supplements while breastfeeding has not been well studied. MotherToBaby recommends discussing supplements with a health professional while breastfeeding.
Questions to bring to a prenatal visit
- What might be causing my sleep problem, and does it need evaluation?
- Is CBT-I or another non-drug treatment available to me?
- What are the risks and benefits of the specific supplement or medicine I am considering, given my pregnancy and other medicines?
Sources and limits: MotherToBaby's 2026 melatonin fact sheet, NCCIH's melatonin overview, the human-study review, and a pregnancy CBT-I trial. This guide summarizes published evidence; it is not a treatment recommendation or a substitute for prenatal care.