Has someone here experience with vitamin A and acne, that means the amount of vitamin A intake without risking overdoses. I noticed improvements by supplementing vitamin A, the problem is that after a while I have to increase the dose, because my acne (back and breast) reappears. I am now at 40 000 IU per day what seems to be high. Has somebody tried even higher doses? Otherwise in the forum once a study was posted in which they treated acne with 500 000 IU. Somebody has experience with this?