The raw materials for making fish oil preparations are common in mackerel, herring, tuna, halibut, salmon, cod liver, blubber, seal oil, etc. generally, a small amount of vitamin E will be added to play an antioxidant role. Fish oil is a new resource food in China. In a broad sense, fish oil is the fat of fish including cod liver oil, but generally speaking, the main functional components of fish oil are DHA (docosahexaenoic acid) and EPA (eicosapentaenoic acid), which can regulate blood lipid, while the main functional components of COD liver oil are vitamin A and vitamin D, The main function is to prevent and treat vitamin A and vitamin D deficiency. Infants under 1 year of age do not need fish oil supplements (vitamin D supplements can be considered) if breast milk or formula + complementary feeding is sufficient.