Omega 3 Fish Oil essential fatty acids (EFAs) are vital nutrients found in cold-water fish, like salmon and mackerel, and in plant sources such as flax seeds and walnuts. Additionally, Omega-3 EPA and DHA have anti-inflammatory properties that may help support joint health and improve flexibility. Since the body cannot produce Omega-3s on its own, they must be obtained through diet or supplements to ensure optimal health.