Hi, I am Dr. Michael Murray. One of the major advances in improving the health of Americans in the last decade or so is the development of highly purified, pharmaceutical-grade fish oils concentrated for the long-chain omega-3 fatty acids EPA and DHA. Research indicates that to cut the risk of a heart attack or stroke, you should take a combined 1,000 mg of EPA and DHA each day. So be sure to calculate the dosage you need by looking at the label closely. The dosage is not 1,000 mg of fish oil; it is 1,000 mg of the omega-3 fatty acids.