Dr Susan Weed recommends these teas instead of a prenatal vitamin during pregnancy. The amount of vitamins and minerals, including folate is better than taking a synthetic vitamin. I did this during my pregnancy and I didn't have any health issues at all, regardless of my age. When asked at the doctors office, if I was taking my prenatals, I'd answer yes. I never felt like I needed to explain what the source of my prenatal vitamins was.
Whatever your fertility issue is, please look up these individual herbs for more details. I like to keep my posts short and there is a lot of information on the following websites about these herbs and more: Natural-fertility-info.com and google Dr. Susan Weed are great resources. Good Luck!