Fish oil is an excellent source of Omega-3 fatty acids. Thousands of studies show the benefits of Omega-3 fatty acids for the heart and circulatory system. Two important Omega-3 fatty acids are eicosapentanoic acid (EPA) and docosahexanoic acid (DHA), both found liberally in cold water fish such as sardines, anchovies, mackerel and salmon. These fatty acids help reduce low density lipoproteins (LDLs) and raise levels of good high density lipoproteins (HDLs). These nutrients also reduce blood vessel constriction, lower fibrinogen, (the blood clotting factor) and keep platelets from becoming too sticky.