This is a question that many people ask when they are considering using melatonin for the first time. It's a good question too. Like testosterone, melatonin is a hormone. Most people are aware taking synthetic testosterone in the form of steroids suppresses normal testosterone production. Fortunately, melatonin supplements are not the same. Research shows taking melatonin supplements does not scupper your body's ability to produce melatonin. That means although you may be back where you started, when you stop taking melatonin supplements you should not be in a worse situation than you were before.