Optimum Fish Oil Soft gels contain long-chain fatty acids, including docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA). DHA and EPA are essential fats that cannot be made by your body. Fatty acids are the basis of fats and oils, and, despite popular belief, are necessary for overall health. These fatty acids are termed “essential” because your body cannot manufacture them by it. So, consuming them through foods like salmon and supplements such as the ON Fish Oil Soft gels that you are holding in your hands is the only way to get DHA and EPA. Our Fish Oil Soft gels are mercury-free and enteric-coated, which means that you get all of the benefits of fish oils without the fishy aftertaste that you might encounter without this special coating.