Fish oil is a general term for all oils in fish, including body oil, liver oil and brain oil. The main fish oil is a kind of oil extracted from fatty fish, which is rich in omega-3 polyunsaturated fatty acids (DHA and EPA) and has health benefits such as anti-inflammation and blood lipid regulation. In a broad sense, fish oil not only refers to fish oil preparations in the form of capsules, but also refers to the fat in fish. The main functional component is omega-3 polyunsaturated fatty acids.