Optimum nutrition fish oil contains long-chain fatty acids, with equally long names such as docosahexenoic acid DHA and eicosapentaenoic acid EPA. DHA and EPA are essential respect that cannot be made by your body. So, consuming them through foods like salmon and supplements such as the fish oil softGels is the only way to get DHA and EPA. The fish oil soft Gels are 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.