Fish oil cannot be considered similar to omega-3 fatty acid because these are not the same things. Fish oil is the rich source of this fatty acid, which can also be found in other sources such as dark leafy greens, flaxseed, etc. But, you can enjoy the benefits of both by taking fish oil and omegas supplements for heart diseases and other problems to remain healthy. It eliminates the possibility of abnormal health rhythm, stroke, heart attack, and more health issues.