The fields of psychiatry and cardiology are looking at fish and fish oil supplements as ways to offset depression and heart disease. The answers aren\'t in yet, but doctors who recommend the supplements say evidence is building that they work to protect your heart and improve your mood. Dr. Alireza Amirsadri, Wayne State University School of Medicine psychiatrist, says fish oil is good for many reasons including cardiovascular and cognitive preventive measures. "It is a mood modulator and reduces anxiety and depression or even manic symptoms."