Has anyone had good or bad experiences treating acne with high doses or vitamin a?

Don't do it: You are asking for serious health problems up to pseudotumor cerebri. / brain injury. This is serious stuff. If real, scientific acne treatment that your physician can offer has failed, a dermatologist can write for accutane. It's pricey, unpleasant & has some risks, but it's safer than what you're proposing to do on your own. Best wishes & i hope you get effective help.