Researchers are seeking participants for a clinical trial examining whether two polyunsaturated Omega-3 fatty acids are effective treatments for depression. The two fatty acids being studied — docosahexanoic acid (DHA) and eicosapentanoic acid (EPA) — are found naturally in fish oil, flaxseed and walnuts. Previous studies have indicated that nutritional supplements that contain Omega-3 fatty acids can be an effective treatment for depression.