Melatonin

Browse By All Topics

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Melatonin

Overview

What is melatonin?

Melatonin is a hormone made by the pineal gland, a small gland in the brain. Melatonin helps control your sleep and wake cycles. Very small amounts of it are found in foods such as meats, grains, fruits, and vegetables. You can also buy it as a supplement.

What does natural melatonin do in the body?

Your body has its own internal clock that controls your natural cycle of sleeping and waking hours. In part, your body clock controls how much melatonin your body makes. Normally, melatonin levels begin to rise in the mid- to late evening, remain high for most of the night, and then drop in the early morning hours.

Light affects how much melatonin your body produces. During the shorter days of the winter months, your body may produce melatonin either earlier or later in the day than usual. This change can lead to symptoms of seasonal affective disorder (SAD), or winter depression.

Natural melatonin levels slowly drop with age. Some older adults make very small amounts of it or none at all.

Why is melatonin used as a dietary supplement?

Melatonin supplements are sometimes used to treat jet lag or sleep problems (insomnia). Scientists are also looking at other good uses for melatonin, such as:

  • Treating seasonal affective disorder (SAD).
  • Helping to control sleep patterns for people who work night shifts.
  • Preventing or reducing problems with sleeping and confusion after surgery.
  • Reducing chronic cluster headaches.

Is taking a melatonin dietary supplement safe?

In most cases, melatonin supplements are safe in low doses for short-term and long-term use. But be sure to talk with your doctor about taking them.

Children and pregnant or nursing women should not take melatonin without talking to a doctor first.

Melatonin does have side effects. But they will go away when you stop taking the supplement. Side effects may include:

  • Sleepiness.
  • Lower body temperature.
  • Vivid dreams.
  • Morning grogginess.
  • Small changes in blood pressure.

If melatonin makes you feel drowsy, do not drive or operate machinery when you are taking it.

During health exams, tell your doctor if you are taking melatonin. And tell your doctor if you are having trouble sleeping (insomnia), because it may be related to a medical problem.

In adults, melatonin is taken in doses from 0.2 mg to 20.0 mg, based on the reason for its use. The right dose varies widely from one person to another. Talk to your doctor to learn the right dosage and to find out if melatonin is right for you.

Where can you find a melatonin supplement?

You can buy melatonin supplements without a prescription at health food stores, drugstores, and online. Melatonin should only be taken in its man-made form. The form that comes from ground-up cow pineal glands is rarely used, because it may spread disease.

Other Places To Get Help

Organizations

National Center for Complementary and Alternative Medicine (NCCAM), National Institutes of Health
9000 Rockville Pike
Bethesda, MD  20892
Phone: 1-888-644-6226
Fax: 1-866-464-3616 toll-free
TDD: 1-866-464-3615 toll-free
Email: info@nccam.nih.gov
Web Address: www.nccam.nih.gov
 

The National Center for Complementary and Alternative Medicine (NCCAM) at the National Institutes of Health (NIH) explores complementary and alternative healing practices in the context of rigorous science, trains complementary and alternative medicine researchers, and gives out authoritative information.


National Sleep Foundation
1010 North Glebe Road
Suite 310
Arlington, VA 22201
Phone: (703) 243-1697
Email: nsf@sleepfoundation.org
Web Address: www.sleepfoundation.org
 

The National Sleep Foundation, an independent nonprofit organization, can provide you with brochures on sleep disorders and a list of accredited sleep disorder clinics.


References

Other Works Consulted

  • Melatonin (2009). Review of Natural Products. St. Louis: Wolters Kluwer Health.
  • Rajaratnam SM, et al. (2009). Melatonin and melatonin analogues. Sleep Medicine Clinics, 4: 179–193.

Credits

ByHealthwise Staff
Primary Medical ReviewerKathleen Romito, MD - Family Medicine
Specialist Medical ReviewerAlfred Lewy, MD, PhD - Psychiatry
Last RevisedJune 20, 2012



This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use.

How this information was developed to help you make better health decisions.





© 1995-2012 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.