Well depending on what type of yeast infection your talking about there are always OTC (over the counter) medications and/or vitamins that come to mind.
For reocccurent yeast infections you should see your Dr. This can be a symptom or sign of something else. Don't worry just yet yeast infections can also be semi-normal.
For an abundence of yeast in the body there is a vitamin called Canditis (my spelling on that one may be off). Its a supplment you can take daily that helps with digestion and other "yeasty" issues.