Eat right. Sleep. Exercise. No stress.
I've been researching this shit for months and I have a lot to contribute.
First of all, cut all sugary stuff, basically go low carb.
Adopt a lot of meat, fish, eggs, poultry, vegetables, moderate amount of fruit.
Forget about vegetable oils, cut out alcohol, possible allergens, any processed food.
Basically eat home made food and stuff that you don't have to right down 100 ingredients to say what you're eating.
For supplements I would recommend zinc, vitamin C, cod liver oil (liquid, capsules are shitty), coconut oil, extra virgin olive oil.
Digestion is very important, so are bowel movements. A little bit of apple cider vinegar before each meals helps you acidify the stomach and destroys all kinds of bacteria.
Try to get at least a bowel movement per day so that said drink lots and lots of water. Digestion slows down after 8 pm. so try to have all your meals during the day.
Exercise is very important - needless to say sweating. And all the other benefits you already know.
Sleeping is also vital. Get 8 hours of sleep and try to do that in complete darkness.
Stress seems also to contribute so anything that helps you - from music to walking in the nature, do it.
Avoid gluten. Vitamin A is essential - excellent source: liver. Vitamin E - extra virgin olive oil.
Here's an extremely good link:http://www.arthurdevany.com/?p=1317
In my opinion, if you even have moderate acne doing just few of these will help you enermously. Cutting out bad carbs, exercising and getting enough sleep will probably change things dramatically.
And please guys, don't go the Accutane route. I've read so, so, so many stories that I will never consider it in a lifetime. Antibiotics are very harmful so if you can avoid those.
I know it all sounds like a 'paradigm shift' but if you spend the amount of time I did on this thing you know practically everything I'm saying is right. There's a lot of controversy going on about everything, but these are pretty much the things that everybody has agreed on.
And I did the topicals/antiobitcs routine and it didn't work. Major changes were after serious reconsideration of lifestyle and diet.