Cod liver oil is a fat extracted from the liver of some fish, containing unsaturated fatty acids, and is a compound preparation of vitamin A and vitamin D. There are no clear rules on when to take cod liver oil, some doctors think it should be taken in the morning on an empty stomach or after a meal, some doctors think it is better to take it at night before going to bed, it is recommended that patients choose the right time to take it according to their own situation: 1, taken in the morning on an empty stomach: some doctors think it can promote the absorption of cod liver oil on an empty stomach, but also to a certain extent to avoid the impact of other drugs or food on cod liver oil, gastrointestinal Healthy people can choose to take cod liver oil at this time; 2, taken after meals: some doctors believe that cod liver oil has certain stimulation to the intestines and stomach, especially babies, the elderly and patients with weak spleen and stomach, it is recommended to take cod liver oil after meals to reduce the stimulation to the intestines and stomach; 3, taken before bed: some doctors also believe that cod liver oil can be taken at night before going to bed with calcium tablets at the same time, for cod liver oil digestion and absorption has a better promotion effect. After taking cod liver oil, you can get a moderate amount of sunlight, which can help improve the calcium deficiency of the patient, and after taking cod liver oil, there is no need to supplement vitamin D. Note that cod liver oil contains vitamin A and vitamin D, which are fat-soluble vitamins and should not be used as a supplement for a long time.