My opinion
This is just my opinion: I am sure others will have more to say on the matter.
In my opinion, the skin is the largest organ of the body and is a window to your inner health. If your skin is bad, it is because of dirty bowels, liver, and blood, or hormone imbalance. Now, It could be that you have a low grade bacteria, or
parasites that are allowed to exist in the body due to low immune system. With a vengeance, I would clean all the organs, using the protocols. After that, I would go on a juice diet drinking a lot of carrot juice. Starting at the same time as the juicing, Take three (oo) size caps of oregano oil three times a day and grapefruit seed extract (oo) caps three times a day for as long as it takes to kill the organisms making the blood dirty. You may need to stay on all the protocols for a year or more. I would have enemas regularly too. So what ever the problem is, hormones, parasites, bacteria, or dirty organs, this will cover your bases. I do not think that one type of vitamin will cure long term, persistent acne.
Ana