Docosahexaenoic acid is a nutritionally-derived ω-3 fatty acid that is abundant in the brain and the retina and is thought to be important in early development and for therapeutic approaches to inflammatory disorders and cancer. 14(S)-HDHA is an oxygenation product of DHA that serves as a precursor to maresin 1 , an anti-inflammatory, pro-resolving mediator that prevents polymorphonuclear neutrophil (PMN) infiltration and stimulates macrophage phagocytosis. At doses as low as 0.2 ng/mouse 14(S)-HDHA administration resulted in reduced infiltration of PMNs into sites of inflammation.