Plus, if you were to actually take two tablespoonfuls of cod liver oil on a daily basis, you would eventually begin to suffer from hypervitaminosis A (a fancy way of saying vitamin A overdose).

• 其他铅、铬、砷等等若超过自然本底含量均能造成环境污染。其危害取决于它在环境、食品、生物体中的浓度及化学形态和化学状态。重金属污染物不能自净、无法消失。