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Omega-3 essential fat deficiency is one of the most common nutrient deficiencies. Only a handful of foods—some types of fish, flaxseeds, walnuts—contain omega-3’s in significant amounts. Consequently, even many healthy eaters don’t get enough of them. Adequate omega-3 intake is needed for healthy cell walls, nervous system function, immune function, and more.
If you regularly eat the few foods that contain large amounts of omega-3’s, you don’t need to take a fish oil supplement. Otherwise, you should. In any case, it can do no harm. Another option, if you’re vegan, is flaxseed oil, but fish oil is considered the best source of omega-3’s because it contains two specific fats—EPA and DHA—that flaxseed oil lacks.