Apple Approved iPhone Car Charger

I'm looking for a car charger for my iPhone. There isn't one available from Apple, but there are a few made by third parties. I always hear that you're not supposed to use third party chargers and what not because it'll do this and that with your battery and since the iPhone battery is a critical part of its functionality, I'm wondering if using a third party charger is OK, and if Apple is hiding a car charger somewhere that I can't see.