Summary: Cod liver oil is rich in vitamins A and D, so some women take cod liver oil during pregnancy. However, research shows that if pregnant mothers take too much cod liver oil, in addition to causing itchy skin and hair loss, there is also a serious hidden danger. Cod liver oil is rich in vitamins A and D, so some women take it during pregnancy. However, research shows that if pregnant mothers take too much cod liver oil, in addition to causing skin itching