... omega-3 fatty acid that found mostly in fatty fish, in small amounts in eggs, and in very small amounts in seaweed. Some EPA is converted ... omega-3 fatty acid that found mostly in fatty fish, in small amounts in eggs, and in very small amounts in seaweed. It is a major ... component of the gray matter of the brain, and also found in the retina, testis, sperm, and cell membranes. Low levels of ...