NOW® DHA-500 is a potent enteric-coated fish oil supplement that has been introduced to meet the needs of those individuals who wish to supplement higher concentrations of DHA ( Docosahexaenoic acid) . Each enteric-coated soft gel contains 500 mg of DHA and 250 mg of EPA ( Eicosapentaenoic acid) —the highest potency currently available in an enteric-coated softgel. Like most NOW fish oil products, the oil in NOW® DHA-500 is molecularly distilled for purity and potency. It is tested to be free of potentially harmful levels of contaminants such as mercury, heavy metals, PCB's, dioxins, and other contaminants.