Vitamin C, also known as ascorbic acid, can intensify the acidity of urine and in the expulsion of infectious bacteria.
 For maximum results it should be administered to bowel tolerance, or when the stool becomes soft and almost diarrhea-like.
 When fighting an infection, the body can require up to 15,000 mg of vitamin C daily and sometimes even more intravenously.
    Since it is water soluble, vitamin C should be taken every 2 to 3 to prevent nutritional loss during excretion.
 People who do not suffer from an infection but wish to take vitamin C as a preventative agent should take between 2000 and 6000 mg a day.
    Vitamin C serves as an effective combatant of urinary tract infection because of its antibacterial attributes and its ability to enhance the operation of the immune system by encouraging the production of infection-fighting white blood cells.
  During acute attacks, a daily dose of 50 mg of zinc can assist the body in white blood cell production and the elimination of bacterial intruders.
 In addition to zinc and vitamin C, vitamin A can fortify the mucous membrane lining of the bladder, prevent irritation of the bladder and improve functioning of natural antibodies and white blood cells.
    Note, though, that pregnant women, or those who may be pregnant, should substitute vitamin A supplements with risk-free beta-carotene, as studies have correlated high maternal dosages of vitamin A with birth defects.
 Other people can receive sufficient quantities of vitamin A by consuming up to 25,000 IU in halibut or cod liver oil capsules daily.
    Some additional preventative agents that can be used daily include 100 to 200 mg of vitamin B6 and up to 6 capsules of evening primose oil.