Folic acid also known as folate is a b vitamin which thought to be needed for cell replication and growth folic acid helps form building blocks of dna and building blocks of rna needed for protein synthesis in all cells therefore rapidly growing tissues such as that of a foetus and rapidly regenerating cells like red blood cells and immune cells have a high need for folic acid folic acid deficiency results in a form of anaemia that responds quickly to folic acid supplementationwhere