high folic acid may be caused by a diet rich in folic acid which is used in fortified foods and supplements and absorbed at a higher rate than folate found naturally in food. it can also be influenced by a vitamin b12 deficiency which causes folic acid to build up on the blood. so it makes sense to get your b12 levels checked to see if that is contributing to your folic acid levels. for more details on folic acid see this webmd article.
why is my folic acid too high in the blood work i had done?