Copper is a component of hemoglobin, the protein that carries oxygen in the red blood cells.- Hyla Cass, M.D., Supplement Your Prescription: What Your Doctor does not Know About Nutrition (Get the book.)Note: To take this high a dose of EPA/DHA without swallowing a dozen capsules a day, you will need to use a highly concentrated fish oil supplement he is 90 percent composed of these fatty acids.