The Natural Fish Oil Concentrate used in this softgel is manufactured under strict quality control standards.&ampnbsp; It is tested to be free of potentially harmful levels of contaminants (i.e. mercury, heavy metals, PCB's, dioxins, and other contaminants).From the FDA's website: &ampnbsp;Supportive but not conclusive research shows that consumption of EPA and DHA omega-3 fatty acids may reduce the risk of coronary heart disease.