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Home > Health Library > 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.
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.
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:
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:
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.
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.
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.
Current as ofSeptember 11, 2018
Author: Healthwise StaffMedical Review: Kathleen Romito, MD - Family MedicineAlfred J. Lewy, MD, PhD - Psychiatry
Current as of:
September 11, 2018
Medical Review:Kathleen Romito, MD - Family Medicine & Alfred J. Lewy, MD, PhD - Psychiatry
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