Fish oil is a dietary supplement derived from the tissues of oily fish, such as salmon, mackerel, and sardines. It is rich in omega-3 fatty acids, which are essential fats that the body cannot produce on its own. These fatty acids are known to support heart health, reduce inflammation, and promote brain function. Many people take fish oil supplements to help meet their daily omega-3 needs, especially if they do not consume enough fish in their diet. It is available in liquid form or as capsules, making it easy to incorporate into daily routines.