Although there is limited research into yogurt’s relationship to vaginal health, eating yogurt or inserting it into the vagina is a popular folk. It is an effective method of treating vaginal yeast infection. But be sure to take some care while doing this method. Steps to be followed Take some unsweetened plain yogurt and apply this to a plastic tampon. Let it freeze for few minutes and place this frozen tampon directly into vaginal yeast infected areas. Yogurt for Yeast Infections A vaginal yeast infection is a common female issue caused mainly by the group of microscopic fungi called Candida albicans. The Candida genus of yeast is a naturally occurring microbe and doesn't cause any infection until there is an imbalance in your system.