The reason why cod liver oil and calcium tablets are taken together depends mainly on the specific action of these two drugs. Cod liver oil is rich in vitamin A and vitamin D. It is mainly used to treat a series of diseases caused by vitamin A or vitamin D deficiency. Calcium tablets are rich in calcium ions, and by using cod liver oil and calcium tablets, the body can consume more vitamin D and calcium ions. Vitamin D is an important substance to promote the absorption of calcium ions, through the intake of these two drugs can cause a rapid increase in calcium ions in the blood, and can be converted through the absorption of vitamin D, rapid settlement into the bone, used to treat osteoporosis and other diseases with good results.