What are omega-3s? Omega-3 fatty acids are a group of fats that occur naturally in certain foods and in the human body. They are also available as dietary supplements and are sometimes called n-3 fatty acids. • Most scientific research has focused on two types: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). • EPA and DHA are primarily found in seafood, especially fatty fish such as salmon, mackerel, and tuna, as well as in shellfish and fish oil supplements. • Another omega-3, ALA