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is also known as vitamin B9, is a water-soluble vitamin. It is one of the vitamin B complex, equivalent to pteroylglutamic acid (pteroylglutamic acid, PGA), Mitchell (H.K.M itchell, 1941) extraction and purification from spinach leaves, so named folic acid. Have promote bone marrow cells mature, such as lack of folic acid can cause human giant red blood cell anemia, and white blood cells reduce disease, is especially important for pregnant women.