Omega-3 fatty acids (also known as n-3 fatty acids) are chemical compounds that naturally occur in some fats and oils. As one of the "essential" fatty acids, Omega-3 oils are required for normal growth, but they also provide a wealth of other benefits.

Omega 3 oils have many beneficial effects, including reducing the risk of thrombotic stroke and heart disease, reducing cholesterol, improving immune system activity, and stimulating blood circulation while reducing blood pressure. They have also been linked with positive effects in schizophrenia treatment, as well as being considered a "brain food" for many years, although without significant scientific evidence.

Although eggs and walnuts are also source of omega 3 oils but fish is renowned one. Mackerel, sardines, anchovies, salmon, and herring, besides tuna to a slighter quantity have major supply of fish oil, which contains the seven times strong omega 3 oil than the other kinds of fish

Despite of the well documented benefits of omega 3 oils and its consuming through fish, the Food and Drug Administration has recently warned about oily fish poisoned with heavy metal, which is also used to produce omega-3 oils. In cold-water fish dangerous heavy metals such as arsenic lead, nickel, mercury and cadmium could accumulate. Therefore it is really important that you know your source of fish or omega 3 oils.

A reduction in blood pressure and a consequent improvement in circulation of the blood is one of the many effects of Omega 3. This may explain the migraine relief effects of Omega 3 fish oil, since the pain experienced by headache sufferers is caused by dilation of blood vessels, which is triggered by reduced blood flow in the brain. Ingesting Omega 3 decreases the instances of this reduction in blood flow, thus providing effective migraine relief.

As omega 3 minimizing the blood triglyceride levels by increased circulation therefore you can get peculiar effects on your heart. Omega-3 minimizes the risk of heart attack if it used frequently. Clotting is a major cause of heart attack. Omega 3 oils prevent clotting by breaking the compound recognized like fiber which is main root of clot forming. Thus we can minimize threat of stroke.