The main benefits of fish oil come from the omega-3 fatty acids it contains, namely docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA).
Omega-3 fatty acids in the diet assist in lowering triglycerides, reducing the risk of heart attack and helping prevent hardening of the arteries,
The American Heart Association recommends that you eat fatty fish at least twice a week rather than take supplements. Know where your fish come from in order to avoid fish that may be tainted by mercury.
Taking up to 3 g of omega-3 fatty acids from fish per day is classified by the U.S. Food and Drug Administration as GRAS (generally regarded as safe).
Do not exceed the recommended dosage on any supplement you take. Too much fish oil can cause other health problems such as diarrhea, bleeding and certain kinds of stroke.