Taking cod liver oil in the morning has the best effect. Because after taking cod liver oil in the morning, cod liver oil can promote the body’s absorption of calcium. The main components of cod liver oil are vitamin A and vitamin D. Its main functions are to maintain eyesight, regulate calcium and phosphorus metabolism in the body, and prevent rickets and night blindness. Infants and children start taking cod liver oil after half a month of life to supplement vitamin D until two weeks of age to promote normal calcium absorption throughout the growth and development stage. However, if there is less sun exposure after two weeks of age, the time to take cod liver oil needs to be extended to about three weeks of age. Taking cod liver oil should be taken in appropriate amounts according to the age and physical condition of the people taking it, and should not be taken in excess to avoid causing vitamin A toxicity and affecting the health of the organism. It should be noted that when taking cod liver oil, it should not be taken together with eating milk, otherwise it will affect the absorption of the nutrients of cod liver oil.