Essential Fatty Acids (EFA's) are naturally occurring unsaturated fats that are considered essential because they are not produced by the human body. There are two essential fatty acids: linoleic, sometimes referred to as the Omega-6 fatty acid, and alpha-linolenic, referred to as the Omega-3 fatty acid. Without these essential fatty acids, several bodily functions would not be possible. The body uses linolenic acid to make two other essential fatty acids, docosahexaenoic acid, commonly referred to as DHA, and eicosapentaenoic acid, or EPA. These fatty acids are found in fish oil as well.