Vitamin B9, also known as folate or folic acid, is a water-soluble vitamin that plays a crucial role in cell division and the formation of DNA. It is essential for the production of red blood cells and helps prevent anemia. This vitamin is particularly important during periods of rapid growth, such as during pregnancy, as it supports the development of the fetal nervous system. Good dietary sources of vitamin B9 include leafy green vegetables, legumes, nuts, and fortified foods like cereals. The recommended daily intake varies by age and life stage, but it is especially vital for pregnant women to ensure adequate levels to reduce the risk of neural tube defects in the developing baby.