Sarah Regan

mbg Spirituality & Relationships Editor

By Sarah Regan

mbg Spirituality & Relationships Editor

Sarah Regan is a Spirituality & Relationships Editor, and a registered yoga instructor. She received her bachelor’s in broadcasting and mass communication from SUNY Oswego, and lives in Buffalo, New York.

Tired Woman Sleeping On A Table

Image by Ulas & Merve / Stocksy

June 20, 2023

Our editors have independently chosen the products listed on this page. If you purchase something mentioned in this article, we may

earn a small commission.

Melatonin is a popular sleep aid to pack when you’re traveling to a new time zone since it can help shift your circadian rhythm and sleep timing. But if you’re looking to take the hormone nightly to help you wind down for bed, be sure to read these busted myths first:


This ad is displayed using third party content and we do not control its accessibility features.

1. Melatonin is a sleep supplement

While the use of melatonin as a supplement has become popular in more recent years, it is, in fact, a hormone that the body naturally produces.

And for what it’s worth, melatonin isn’t advertised (or used casually) as a supplement outside of the United States and Canada, according to David Kennaway, Ph.D., the research program leader of the Circadian Physiology Group at the University of Adelaide in Australia. He previously explained to mbg that outside the U.S. and Canada, melatonin often requires a prescription and is only intended for short-term use.

2. Melatonin helps with sleep quality

You might think that because melatonin signals to your body that it’s time to sleep, it would also improve your overall sleep quality. But according to functional medicine doctor Frank Lipman, M.D., melatonin is better suited for getting your sleep schedule/circadian rhythm back on track temporarily. There is limited evidence1 that it improves nightly sleep quality over longer periods of time.

And as Kennaway adds, the hormone won’t necessarily make it easier to stay asleep or reach deep sleep stages, even if it helps you fall asleep.


This ad is displayed using third party content and we do not control its accessibility features.

3. It’s safe to take in high quantities

It might be tempting to pop another melatonin when you want to fall asleep fast, but Shelby Harris, PsyD, DBSM, a behavioral sleep doctor and author of The Women’s Guide to Overcoming Insomnia, previously told mbg that melatonin is best consumed in low doses (0.5 milligram to 1 milligram).

“If you’re taking more than 3 to 5 milligrams nightly, then melatonin isn’t likely for you. There’s just no data suggesting that more than [0.5 milligram to 1 milligram] is indicated for sleep issues, and sometimes more is just more,” she explains. On top of that, mbg’s vice president of scientific affairs Ashley Jordan Ferira, Ph.D., RDN, adds that “Taking melatonin, particularly at higher doses, can be linked to undesirable desensitizing phenomena, such as nightmares, grogginess, and headaches.”


This ad is displayed using third party content and we do not control its accessibility features.

4. Melatonin is side-effect free

And last but not least, just because melatonin is produced naturally by our bodies doesn’t mean it comes without side effects when consumed exogenously as a sleep aid. As Lipman previously told mbg, since melatonin is a hormone, it can affect your other hormones as well. “Taking a lot of melatonin—a lot of people take 3 to 5 milligrams to sleep—over time is going to affect your other hormones and suppress your body’s own ability to make melatonin,” he says.

Additionally, research has shown2 that while side effects of taking melatonin are typically mild, headaches, queasiness, and dizziness have also been reported. There is also some evidence that taking high doses over time can throw off reproductive hormones like estrogen and testosterone3.

The takeaway

If you’re trying to quickly adjust your sleep schedule, melatonin may be helpful for short-term use. But if you’re taking it every night, you might be better off with a melatonin-free alternative, like the expert-backed options we rounded up here.*

If you are pregnant, breastfeeding, or taking medications, consult with your doctor before starting a supplement routine. It is always optimal to consult with a health care provider when considering what supplements are right for you.