Certain creams containing vitamin E may aid in healing of scar tissue/stretch marks thus affecting their appearance but will not prevent/stop them if you are genetically predisposed or have certain skin colourations. The earlier you start (when they are red/new) the better chance you have of making a difference. Despite this, some people will still get them and be unable to get rid of them.
That said who cares. I don't have any but my ex did from weight gain. Didn't bother me and shouldn't (ideally) bother anyone else.