Omega-3 is an essential fatty acid (EFA), also known as a polyunsaturated fatty acid (PUFA). It is derived from both animal and plant sources, although Omega-3 from fish oil is the most common supplemental form. Fatty acids form the main useful fraction of fats and oils and are necessary for overall health. Because your body cannot manufacture essential fatty acids, you must get them from food or supplemental sources. Our Omega-3 Fish Oil concentrate is manufactured under strict quality control and is screened to ensure the absence of potentially harmful contaminants (i.e. mercury, heavy metals, PCB's, dioxins, and other contaminants). Derived from salmon, sardines, anchovies, and mackerel fish.