Does anyone know of a cheap acne cream, that is effective and doesn't contain anything harmful?

Such as xanthan gum or any other ingredient that contains processed gluten (msg). It seems EVERY acne medicine I've ever come across has something bad in it. I'm looking for a cream that doesn't have gums, starches, or anything derived from corn or soy. That is free from processed gluten. I need a good antibiotic cream, but they all seem to have something bad in them.