The number of fish oil supplements an individual should take for high triglycerides is 1 to 4 grams daily, states WebMD. Either 4 grams of fish oil, or fish oil providing 2.04 grams of eicosapentaenoic acid and 1.4 grams of docosahexaenoic acid daily has been studied for high blood pressure.
EPA and DHA are two of the most significant omega-3 fatty acids in fish oil supplements, according to WebMD. The number of supplements to take varies depending on the reason for taking it. Heart disease patients who want to decrease their overall death risk should take fish oil that supplies 0.6 to 3.7 grams of DHA with 0.3 to 6 grams of EPA. Rheumatoid arthritis patients should take doses of fish oil that supply 3.8 grams of EPA and 2 grams of DHA daily.