I had terrible Acne on my back for all my life. A year ago I started taking MSM + L-opti-Zinc - and after few months my back became 100% clean. Zinc+MSM cleanses liver very good. Then I started high doses of Iodine and got some new heavy eruptions on my back (probably more toxins coming out) and now again my back is even more clean. I never have even small blackheads now. So I recommend L-opti-zinc (60mg/day) + MSM (8 grams/day) + SSKI (1 gram/day) + 3 drops of Lugol's (to get some elemental Iodine). Do it at least for 6 month. By the way I was vegetarian long time ago but became vegan (no cheese / eggs) at the same time I started zinc+MSM (1 year ago). Before I became vegan, I always noticed that cheese make my Acne much much worse. So also don't forget to check your diet - just taking supplements may be not enough.