Why is folic acid is vital to every person?

Folic acid (vitamin B9) is vital to everyone. What is it for? First, to establish and maintain healthy new cells. Its presence is particularly needed during periods of rapid development of the organism. So it is necessary for pregnant women and small children. With a shortage of folic acid it suffers from bone marrow (that is where there is an active cell division), resulting in megaloblastic anemia (a blood disorder).
Neither animal nor man can synthesize vitamin B9. In our body it comes with food or by the synthesis of intestinal microflora.
Folic acid in sufficient quantity is contained in green leafy vegetables, citrus fruits, liver, yeast, legumes, as well as part of the honey.
What amount of folic acid is essential for our body? According to Russian documents adult enough to 400 micrograms of folic equivalent per day. Pregnant women are advised to consume 600 mcg and lactating mothers - 500 micrograms.