There are no supplements as such that can help. There is the accutane, but this drug is brutal, and should be used only when nothing else helps and acne is really bad. Make sure to try out the following tips before you consider using this drug:
1. Sun tanning is a very effective means of reducing acne and drying out the skin.
2. Use anti-acne lotions at least once per day. Go to your doctor and ask him to prescribe you a topical acne cream. It'll work better then anything available over the counter and your insurance will cover it.
3. Make sure you are showering 3 times per day: upon waking, after workouts and before bed.
4. Zinc containing creams are very effective and available over the counter. Apply them to your trouble areas.
5. Black ointment is extremely effective. It stinks pretty badly, but I am pretty sure you can deal with it for a couple of hours in order to get rid of acne.
6. Shaving foam is very effective in drying out the skin, and it is very easy to get in any shop. Apply it on the troubled area for 15-20 minutes, and wash it off.