There is no official recommendation or guidelines from any authoritative health organizations for the dosage of fish oil an average adult needs daily, but many advocate that the omega-3 fatty acids found in certain fish and fish oil supplements, is essential to heart health. The American Heart Association recommends eating albacore tuna, mackerel, lake trout and other fatty fish at least twice a week for healthy adults, with the exception of pregnant or nursing women.

On the Other: Consider the Side Effects

Fish oil supplements do not have to be regulated by the government, so there is always a question whether there are harmful substances such as mercury in the supplements and if they are providing the right type of omega-3 fatty acids that are needed. High amounts of fish oil can have side effects and cause bleeding.

Bottom Line

The Food and Drug Administration considers up to 3 grams of fish oil daily as safe. Dosage may be higher for those with certain health conditions under medical supervision. Eating fatty fish two to three times a week is the best way for a healthy adult to get all of the fish oil needed. Consult with your doctor before using any supplements.

Source:

American Heart Association Recommendation

Mayo Clinic: Safety of Fish Oil and Omega-3s

University of Maryland Medical Center: Omega-3 Fatty Acids

Resource:

Fish Oil Information