There a great many benefits to fish oil and just about everyone should be taking them.  As with everything beneficial, occasionally there are some side effects. Fish oils do have some rare side effects.

Omega 3 contains powerful essential fatty acids. It is the most beneficial form of the omegas, contains 2 fatty acids EPA and DHA, and they can only be found in fish oil.  These 2 fatty acids are essential to fight or prevent both physical and mental disease.  EFA’s are important in normal body functions including regulating pressure in the eye, joints and blood vessels, promoting healthy circulation, balancing the hormonal system, maintaining proper kidney function, preventing blood clots, just to name a few.

Not everyone can tolerate fish oils.  Allergic reactions have been reported, and it is not known if this is due to the fish oil itself, or the gelatin capsule they come in.  More serious contraindications may be excessive bleeding in people who may be taking blood thinners, and fish oil may not be advisable if severe high blood pressure is not under control (due to possibly increase risk of hemorrhagic stroke).

There is one specific drug that fish oil may interact with that needs to be considered.  Fish oil may promote anti-platelet action of aspirin or other NSAIDS such as Ibuprofen and Motrin.  Therefore the use of fish oil with aspirin may be harmful.

It has been reported in some cases that large doses of fish oil may suppress the immune system and consequently may not be advisable for people with suppressed immune systems.  A large dose in this case considers to be 3 grams per day or more.

No adverse reactions with pregnancy have been shown in humans.  However some studies in animals have reported an increase in the rate of prolonged difficult labors and an increase in blood loss during labor.

Some people have reported allergic reactions, mainly rashes. Another side effect is indigestion, especially if people have a problem with digesting fats.  Some other people have commonly reported burping when they take fish oil and a fishy odor on their skin.  I have heard of some rare occasions where fish oils have caused diarrhea and hypoglycemia.

The quality of the fish oil must be addressed. You should purchase your fish oil from a good quality manufacturer.  There have been some instances of mercury found in the fish oil that has not been screened for quality.  Mercury is a very toxic substance and should be avoided at all cost.  Taking a good quality Omega 3 fish oil will give the added benefits, free of side effects.

It is up to the individual to decide whether the potential risks out weigh the potential benefits of fish oil.  I believe Omega 3 fish oil is a critical nutrient that the majority of the US population will benefit from immensely.  Ultimately, the decision on whether to take Omega 3 fish oils is yours. Using fish oil should be an educated decision with caution as to what drugs you are taking. Talk to your physician if your are not sure whether you should be taking Omega 3 fish oil.