You have asked, what are the side effects of EPA - DHA Omega 3 fish oil supplements? There are side effects of taking these fatty acids, however, these a very minor. One of the effects I would caution you about, is the fact that fish oil is a natural blood thinner.
This does not normally matter, unless you are taking aspirin or other Prescription type drugs to thin your blood. If you are, then I advise you to consult with your doctor before starting a course of Omega 3 supplements. Even then, I would not recommend taking more than 2,000 mg per day of these oils.
Bee Pollen Complex
Other minor effects are bloating, belching, flatulence and nausea. You can also get diarrhea from taking too high a dose of Omega 3 supplements. The remedy to fix this, is to reduce the amount of fish oil you are taking. The diarrhea will then simply go away. I have found that most cases of belching are caused by ingesting fish oil that is not quite fresh.
I always recommend that you only buy an oil that has been purified by a process called molecular distillation to remove the impurities such as lead, mercury and the PCBs etc. the remaining oil will be the cleanest you can buy.
A lot of the people in the western world are deficient in the Omega 3 fatty acids. So instead of worrying about the minor side effects of EPA - DHA Omega 3 supplements, you would be better off worrying about how you can remedy this situation.
Most of you are aware of the pollution in our oceans and the fish. However there is a simple solution, just take a purified Omega 3 fish oil supplement each day. These soft gel capsules are easy to swallow, and they help to protect our heart and our brain.