The main component of deep-sea fish oil is fish oil, which belongs to unsaturated fatty acids. Taking it in moderation can help regulate blood lipids, clear blood clots and lower cholesterol, and has a certain auxiliary effect on the prevention of cardiovascular and cerebrovascular diseases, nutrition of the brain and prevention of Alzheimer’s disease. However, long-term overdose of deep-sea fish oil may have certain effects on the human body. Deep-sea fish oil is rich in omega-3 fatty acids, of which eicosapentaenoic acid (EPA) has the effect of inhibiting platelet aggregation. Long-term consumption of deep-sea fish oil may cause blood clotting dysfunction and symptoms such as bleeding gums and nosebleeds. In addition, fish oil is high in calories, and high calories may cause obesity and fatty liver and other related diseases. Long-term consumption of large amounts of fish oil may also cause unpleasant symptoms such as bad breath, nausea, hiccups, epigastric discomfort, heartburn, abdominal fullness and diarrhea. In addition, for the presence of liver disease, or mental illness, such as depression, mania patients are not recommended to take large amounts, as well as children, infants and young children in the process of growth, although need to supplement a large amount of unsaturated fatty acids, but it is not recommended to apply health food fish oil supplement, should be obtained from food. Since deep-sea fish oil does not have medicinal effects, it can only be used for daily conditioning and body maintenance, not for treating diseases. If patients clearly have retinal diseases, liver diseases, cardiovascular diseases, they need to go to the hospital for regular treatment.