Fish oil and cod liver oil have certain differences in composition, efficacy and price. 1. Composition: Although fish oil and cod liver oil are both nutrients, there are some differences in composition. Fish oil is mainly extracted from deep-sea fish fat, and its main component is unsaturated fatty acids. Cod liver oil belongs to fat oil, mainly extracted from the liver of deep-sea fish, the main components of cod liver oil are vitamin A and vitamin D. The main components of cod liver oil are vitamin A and vitamin D. 2. Efficacy: the main effect of fish oil is anticoagulation, regulation of blood lipids, blood pressure, cardiovascular and cerebrovascular diseases and Alzheimer’s disease has a certain preventive effect. Cod liver oil is mainly used as a nutritional supplement for children during their developmental period because of its rich content of vitamin A and vitamin D. 2. Price: Because fish oil and cod liver oil are different in composition, extraction method, function and so on, so there is a significant difference in price between fish oil and cod liver oil in general, and cod liver oil will be relatively more expensive. It should be noted that the distinction is generally used to give the growing children to supplement the nutrition is cod liver oil, fish oil is more used in the adult auxiliary treatment of various diseases, for the use of drugs, it is recommended that patients take under the guidance of a doctor.