"EPA/DHA essentials is an ultra-pure, molecularly distilled fish oil concentrate that has been tested for environmental contaminants (heavy metals, PCBs, dioxins and furans), microbial contaminants, and oxidation and rancidity. It contains well below the strict limits for these criteria as established by the Council for Responsible Nutrition (CRN), Europea Pharmacoepeia (EP) and U.S. Pharmacoepeia (USP). DHA contributes to maintenance of normal vision and brain function. EPA and DHA contribute to the normal function of the heart."