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Melatonin

Melatonin is a hormone produced by a small gland in the brain to help the body regulate the natural cycle of sleeping and waking. Small amounts of melatonin are found in some foods, and it is also available in dietary supplements.

Natural melatonin production is partly affected by light, since melatonin levels are higher at night than during the day. During the shorter days of the winter months, melatonin production may start earlier or later, causing the body to feel as if it needs more sleep.

Melatonin is used to treat jet lag and insomnia. A low dose taken at a certain time during the day may also be effective for easing symptoms of seasonal affective disorder (SAD).

Melatonin supplements are generally safe for short-term use. The safety and effectiveness of long-term use is still being assessed.

Author Jeannette Curtis
Author Caroline Rea, RN, BS, MS
Editor Kathleen M. Ariss, MS
Editor Susan Van Houten, RN, BSN, MBA
Associate Editor Tracy Landauer
Associate Editor Pat Truman
Primary Medical Reviewer Patrice Burgess, MD
- Family Medicine
Primary Medical Reviewer Adam Husney, MD
- Family Medicine
Primary Medical Reviewer Kathleen Romito, MD
- Family Medicine
Last Updated May 25, 2007

WebMD Medical Reference from Healthwise

Last Updated: May 25, 2007
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.