The best fish oil supplement is recommended for heart and brain health, as fish oil supplements contain healthy omega-3s that are essential fatty acids that cannot be produced. Omega-3 can help fight depression and anxiety, improve eye and brain Health, and reduce inflammation. They can also reduce the risk of heart disease by lowering blood pressure and triglycerides, increasing HDL cholesterol levels, and preventing plaque from hardening the arteries. Fish oil supplements also contain harmful contaminants such as polychlorinated biphenyls and dioxins. If you don't like swallowing pills, make sure you can get your recommended dosage in the least capsules possible. The most common side effects from fish oil are gastrointestinal, gastrointestinal problems, and loose loose food.