the reason people take fish oil is for the type of fat it provides: omega-3 fatty acids (dha and epa). most people do not get enough of these fats through diet unless they consume 2 servings of fatty fish such as salmon or tuna per week. these type of fats are important for brain development in babies cardiovascular health and they play a role in brain related conditions such as adhd and dementia. see this article for more information on fish oil.
what vitamins are present in fish oil? carrots are carrots but they contain vitamins as well. what's in fish oil?