Carvacrol, the active ingredient in oregano oil capsules is incredibly effective against harmful organisms such as E-Coli, Campylobacter, jejuni and listeria. More recently because of its success it has been tested on antibiotic resistant Salmonella. That makes it the perfect supplement for your bladder in helping the fight against recurrent urinary tract infections (UTIs), Cystitis, Candida and yeast infections. Test have also linked taking Carvacrol to a healthy prostate.