Probiotics.  The friendly bacteria.
D003556:Cystitis / Q000517:prevention & control; D003967:Diarrhea / Q000517:prevention & control / Q000628:therapy; D005260:Female; D006801:Humans; D007107:Immune System / Q000502:physiology; D015212:Inflammatory Bowel Diseases / Q000628:therapy; D019936:Probiotics / Q000627:therapeutic use*; D014627:Vaginitis / Q000517:prevention & control