Omega-3 fatty acids are polyunsaturated fatty acids, distinguished by having a double bond three carbons away from the end of the hydrocarbon tail. Examples of omega-3s are alpha-linolenic acid (ALA), Eicosapentaenoic Acid (EPA), and docosahexaenoic acid (DHA).

This page covers evidence for omega-3s as a whole and is under construction. For mixed EPA and DHA, see fish oil.