Now Foods Cod Liver Oil is a dietary supplement that provides Omega-3 fatty acids, EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). Cod liver oil is also an excellent source of vitamins A and D3. The cod liver oil contained in the preparation comes from Norway and Iceland and is produced based on strict quality control standards. Docosahexaenoic acid (DHA) contributes to the maintenance of good brain function and, in addition, like vitamin A, contributes to the maintenance of correct vision. The beneficial effect occurs with a daily DHA intake of 250 mg. In addition, docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) contribute to the proper functioning of the heart. The beneficial effect occurs when 250 mg of EPA and DHA are consumed per day. The cod liver oil used to produce cod liver oil is tested for the absence of potentially harmful levels of contaminants (ie mercury, heavy metals, PCBs - polychlorinated biphenyls, dioxins and other contaminants).