服用期是多少呢?? should start taking 3 months before 懷孕 and up to delivery
Folic Acid
Also called: Folacin, Folate, Pteroylglutamic acid, Vitamin B9
Folic acid is a B vitamin. It helps the body make healthy new cells. Everyone needs folic acid. For women who may get pregnant, it is really important. When a woman has enough folic acid in her body before and during pregnancy, it can prevent major birth defects of her baby's brain or spine.
http://medlineplus.gov/