What are Essential Fatty Acids (EFAs)?
Essential fatty acids are a group of fats that are vital for human health. The body cannot make them but needs them for many important functions. Therefore, essential fatty acids must be obtained from dietary sources.
Omega-3 and Omega 6 are families of essential fatty acids used to make local hormones that control the local functioning of tissues throughout the body. Omega 6 fats tend to have pro-inflammatory effects, and the Omega 3s tend to have non-inflammatory effects. For optimal health we need to have a balanced intake of Omega 6s and Omega 3s.
Essential fatty acids include Omega 6 fatty acids, (as found in most common vegetable oils and products from livestock animals raised on grain) and the Omega 3 fatty acids, as found in flaxseed oil, wild ocean fish, wild game, products from livestock raised on green vegetation, and fish oil). Most people consume too much Omega 6 fats and insufficient Omega 3s. Therefore, most of us need to decrease the intake of Omega 6 sources and increase the intake of Omega 3.
Fish oils with high levels of Omega 3 have been shown to exhibit beneficial effects for the maintenance of heart health. They may also help maintain 
healthy bones and joints and support natural joint suppleness and flexibility.
The EPA (Eicosapentaenoic acid) and DPA (Docosahexaenoic acid) present in Omega 3 
fish oil are two essential fatty acids that support cellular function, and can have a beneficial effect on the heart.