vitamin b-9 and folic acid：vitamin b-9generally refers to folic acid. Folic acid is a water-soluble vitamin with a molecular formula of C19H19N₇O6. Named because of its rich content in green leaves, also known as diteroyl glutamate,It is a water-soluble vitamin. It has the effect of promoting the maturation of young cells in the bone marrow. The lack of folic acid in humans can cause macrocytic anemia and leukopenia.