Folate (vitamin B-9) is important in red blood cell formation and for healthy cell growth and function. Folate is essential for proper fat metabolism, DNA and RNA synthesis, and tissue growth and repair.* Adequate folate in healthful diets may reduce a woman's risk of having a child with a brain or spinal cord birth defect.Folate is essential for proper fat metabolism, DNA and RNA synthesis, and tissue growth and repair.* Adequate folate in healthful diets may reduce a woman's risk of having a child with a brain or spinal cord birth defect.