A lot of thing will help. Jump Start. Recommended by many natural health doctors/scientists. One gram per-meal, adding one gram more each meal until you have voluntary diarrhea. This is the immune system telling us that we are saturated with vitamin C and take a little less. If you go over 20 grams a day, you have health problems and need more. You can stay at 20 a day or keep adding more. Staying at will probably do the job, only take longer. Also get mult-vitamins and minerals to increase the effectiveness of VC and help the immune system even more to restore health. Please research Dr F R Klenner and his 28 papers on his therapies.
Your Acne will probably be the victim of regimen. As your health how ever long it takes, you will have few if any colds or flu and allergies. Vitamin c will also remove the toxins in you system. Research; 'sugar the sweetest poison of all'.