Are meleleuca products FDA approved

Maybe, maybe not - but it does not really matter.

Here's what you need to know about supplements and the FDA:
Dietary Supplements: FDA (http://www.fda.gov/food/DietarySupplements/default.htm)

You are better off checking on the internet on questionable ingredients. From what I have seen the FDA only goes after something once there is an outbreak or epidemic.
Oh and from what I know of meleleuca it is safe.