Melatonin may be an over-the-counter supplement, but it can cause significant side effects. American demand for melatonin — a hormone produced by the brain that helps the body get ready for sleep — ...

Melatonin supplements are widely used as a sleep aid, but they can cause headaches, dizziness, and make you feel queasy. While melatonin is generally considered safe, taking too much may lead to ...

Take less than 1 milligram of melatonin to avoid side effects like headaches and confusion. Choose a reputable melatonin brand to ensure it's pure and properly dosed. Taking too much melatonin can ...

(CNN) — More and more adults are taking over-the-counter melatonin to get to sleep, and some may be using it at dangerously high levels, a study has found. The overall use among the US adult ...