Can I take melatonin while pregnant?
Ask your doctor or midwife first. There isn’t enough research on melatonin’s safety in pregnancy or while breastfeeding, so nobody can tell you a dose that’s known to be safe. In the meantime, a fixed wake time, morning daylight and dim evenings help your own melatonin start on time without a pill.
This is general information, not medical advice. It sums up what US health agencies and the studies below say as of November 2026, and anything about your own pregnancy is a question for your doctor or midwife.
Sleep often gets harder during pregnancy, and melatonin looks like the gentle option, since your body already makes it. The US National Center for Complementary and Integrative Health says research on its safety in pregnant or breastfeeding women is lacking. Without that research, nobody can say what dose is safe, so ask first.
We’d leave melatonin out unless your doctor or midwife says otherwise, and work on the light and the timing, which help without any pill.
Dim evening light is the free version of the tablet. It lets the melatonin your own brain makes start when it should.
What helps without a pill
Your brain starts releasing its own melatonin in the evening as the light fades, and light at the eyes holds it back. In a 2011 study of 116 adults, ordinary room light in the hours before bed made their melatonin start later in 99 percent of them and shortened it by about 90 minutes. Light also moves your body clock. Morning light pulls it earlier and evening light pushes it later.
- Get up at the same time every day, and get outside soon after.
- Switch to lamps in the evening, and keep overhead lights off.
- Keep the bedroom dark, and use a dim night light for bathroom trips.
Another reason to ask first
US supplements aren’t checked before they’re sold, and the label often misses. In a 2023 test of 25 US melatonin gummy products, 22 didn’t match their label, from 74 to 347 percent of the stated amount, and one had none. If your doctor or midwife does suggest melatonin, ask which product and strength to use.
If you took melatonin before you knew you were pregnant, mention it at your next appointment.
5 sources
- National Center for Complementary and Integrative Health, Melatonin: What You Need To Know, last updated May 2024nccih.nih.gov
- Gooley JJ and others, Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans, Journal of Clinical Endocrinology and Metabolism, 2011pubmed.ncbi.nlm.nih.gov
- Khalsa SBS and others, A phase response curve to single bright light pulses in human subjects, Journal of Physiology, 2003pubmed.ncbi.nlm.nih.gov
- US Food and Drug Administration, Questions and Answers on Dietary Supplementsfda.gov
- Cohen PA and others, Quantity of melatonin and CBD in melatonin gummies sold in the US, JAMA, 2023pubmed.ncbi.nlm.nih.gov
