– “;6. Folate: Fatigue, Diarrhea, Smooth Tongue, and More;Folate, or folic acid, is a B vitamin that’s particularly important for women of childbearing age, which is why prenatal vitamins usually contain a hefty dose. According to the Mayo Clinic, folate supports healthy growth and function and can reduce the risk of birth defects, particularly those involving the neural tube (the brain and spine). Psota points out that a folate deficiency can decrease the total number of cells and large red blood cells and cause neural tube defects in an unborn child.”