Define Need of vitamin A during pregnancy period?

All four vitamins (A,C,E and K) have specific functions and a common role for all of them is to preserve the structural and functional properties of cells. Excessive consumption of vitamin A is known to be teratogenic. Hence, it is not advisable to use supplements. Vitamin A requirements should be met through diet. Also if ' women of child - bearing age intend using products containing high amounts of vitamin A, they should be advised to consult their physicians before doing so.