Nordic Naturals has always used 100% Arctic cod livers in their cod liver oil (CLO) formulas, no fish body oils or synthetic additives are ever used. Arctic cod (Skrei) has the highest DHA, vitamin A, and vitamin D content of any cod species. Each serving provides approximately 600 mg of the essential omega-3 fatty acids, EPA and DHA, fulfilling the expert recommendation of a minimum of 500 mg per day.