What Kind of Drug Is It?

Melatonin is a dietary supplement sold without a prescription at U.S. health stores or through Web sites. It is sold primarily as a sleep aid because it induces sleep. Researchers have studied melatonin's potential benefits for certain conditions, such as insomnia (difficulty sleeping); jet lag; and even cancer (the uncontrolled, abnormal growth of cells that can lead to serious illness and death).

However, taking melatonin supplements has not been proven by scientific studies to be effective for any condition. Much more research needs to be done to prove the positive claims of melatonin use. Also, because it is considered a dietary supplement, it is not regulated by the U.S. Food and Drug Administration (FDA). This means that the supplements are not produced under the strict guidelines of the FDA, so their side effects and long-term effects are not clearly known...