I keep getting yeast infections and i feel that i am very careful, i take cranberry supplements/vitamins and only use natrual things. whats wrong?

Uncertain: Yeast infections are due to a fungus called Candida which is normally found in the vagina. However, if there is a lack of healthy vaginal bacteria it can lead to overgrowth of yeast. Some causes of overgrowth: antibiotics, ^ estrogen (pregnancy or some birth control pills), malfunctioning immune system, diabetes mellitus as well as friction against vaginal tissues (intercourse) & douching.