Across the country, some parents having trouble getting their little ones to sleep are turning to an "all natural" supplement called Melatonin to help them get a full night's rest.

But some doctors are now warning, that Melatonin might not be as safe and natural as advertised.

ABC News reports, Melatonin in pill form is considered a dietary supplement, and the FDA doesn't regulate supplements as strictly as it regulates food and other drug products.

If you're unfamiliar with Melatonin, it is a hormone that is secreted by your brain and is present in every person's body.

And despite it being a natural chemical, some experts warn that manufactured supplements have not been clinically proven to be a healthy sleep agent.