Mayo Clinic states that the following have strong scientific evidence for use of Omega-3 fish oil:
Evidence suggests that those who have lower levels of EPA and DHA may have a higher risk of coronary heart disease and heart failure. Clinical trials have suggested that omega-3 fatty acids may have benefits regarding reducing total and heart disease mortality. Omega-3 fatty acids may also help lower triglycerides and inflammation. A reduction in the risk of sudden heart failure has been linked to daily intake of Omega-3.
Several studies have reported that the use of omega-3 fatty acids may help in reducing blood pressure. Effects may be greater in those that have high blood pressure and depend on the dose.
Numerous studies show improvements in experiencing stiffness in the morning as well as joint tenderness with regular consumption of fish oil supplements for up to 3 months. Benefits may even increase with the added use of ibuprofen or aspirin.
Research has shown that omega-3 helps in lowering triglyceride levels. Being overweight can trigger higher levels of triglycerides. While these fats are an important source of energy in the body, high levels can be dangerous and hurt your heart. Like cholesterol, triglyceride, in high levels, can lead to clogged arteries and possibly heart attack or stroke. Consumption of omega-3 can lower these levels.