Does taking prenatal pills help your hair grow if you are not pregnant?

Not really. Prenatal pills are just multi-vitamins. While most of them contain iron, which is known to help hair growth, and some contain biotin (one of the b vitamins), which is also good for hair, they are not present in high enough dosages. You are better off just taking the iron and biotin - or better yet, let a dermatologist try to find out what is causing your hair loss in the first place.