Lizbeth,
Kefir is good. I have taken more than 150 liters of it in two years and still do. But, it won't cure your chronic vaginal candidiasis. I have seen how women post about this problem during almost 3 years I have been visiting this forum. To get a proper treatment to cure a persistent vaginitis you need to research the archives about it. You will find interesting posts about this topic. If you want to go straight, research the work done by Dr. Marjorie Crandall about vaginitis. It is the best I have been across about vaginal candidiasis. I am man but is sad to see women suffering with it without to find a cure. When yeast go intracellular, there aren't topical remedies that work, neither Rx, nor naturals.
I hope this help you,
Jorge.