natural hair products like mousse or straighteners

I'm trying to use all natural hair/beauty products.  Is there such a thing as a natural product that will make your hair straight?  Are there natural alternatives to every kind of hair product?  I need a haircut because my hair is entirely too long.  I'm thinking of a medium length razor cut but I know that it looks best with perfectly straight hair.  My hair is annoyingly slightly wavy with little curly bits around my forehead.  Flat irons are damaging and I can never get close enough anyway.  Plus, I don't want to spend a lot of time on my hair everyday.  Guess I'm just looking for some advice.