The active ingredient is concentrated omega-3 acid ethyl esters that are made from fish body oils that are purified and esterified.[1] For the Lovaza product, each 1000 mg softgel capsule contains 840 mg omega-3 fatty acids: eicosapentaenoic acid ethyl ester (460 mg) and docosahexaenoic acid ethyl ester (380 mg).[2]