As of 2015, the recommended fish oil capsule dosage is 2,000 milligrams daily, for 500 milligrams of omega-3 fatty acids, states Nature Made. Taking capsules containing 3.2 grams of eicosapentaenoic acid plus 2.2 grams of docosahexaenoic acid daily for three weeks improves athletic performance, notes Mayo Clinic.
Five capsules containing 450 milligrams of EPA, 100 milligrams of DHA and 50 milligrams of other omega-3 fatty acids daily for three months treats anxiety, explains Mayo Clinic. Daily doses of capsules with 1.2 to 3.3 grams of EPA and 0.6 to 1.8 grams of DHA for a year treats Crohn's disease. Consumers should read the labels on their supplements to determine the quantity of omega-3 fatty acids in each capsule, notes Nature Made.