Omega 3 is an essential fatty acid efa that is sourced from fish oil fatty acids are the basis of fats oils and are necessary for overall health and well being they are essential to the human body because they are a component of every living cell in the body efas are necessary for rebuilding existing cells and the production of new cells essential fatty acids are made up of epa eicosapentaenoic acid and dha docosahexaenoic acid which are both long chain fatty acids that have been sh