No, because the natural folic acid has isomers, low absorption rate, 60% so eat vegetables and fruits will not lead to excessive folic acid, and vegetables during pregnancy to eat less easy to lack of folic acid.

Normal people do not need to deliberately supplement folic acid, normal food will contain traces of folic acid.

Unless it is during pregnancy, or long-term alcohol consumption of women need to be specifically supplemented, the normal does not lack, there is no need. Too much folic acid can also block the absorption of vitamin B12, leading to neurodegeneration, causing neurological lesions and aggravating cognitive damage. Excessive folic acid intake in children may also hinder the absorption of iron. It can also aggravate anemia.