Cod liver oil is an old-fashioned home remedy that modern research has proven right. Cod liver oil has enormous health benefits. These are primarily due to its high concentrations of vitamins A and D and omega-3 fatty acids. If you are looking at cod liver oil as a dietary supplement for you or your children, there are several things to consider. Determine your need for cod liver fish oil benefits. Look carefully at your diet with an eye toward other sources of vitamins A and D and omega-3 fatty acids you are consuming. Think about what medical conditions you or your child suffers from. Research has suggested that cod liver oil is good for ear aches in children, arthritis and joint problems, heart disease and many other common conditions. Make certain you are not pregnant. The use of cod liver oil for pregnant women may not be recommended because vitamin A can harm the baby.