It is often used to help with jet lag or trouble sleeping and comes as tablets, capsules, an oral liquid and chewable gummies. Melatonin is also a natural hormone your body secretes in response to darkness to help maintain your wake-sleep cycle (also called “biological clock”). More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.