iO Cod Liver Oil is a fat-soluble supplementary source of Vitamins A and D. Cod liver oil is a superb source of decosaheaxenoic acid, which is also known as DHA, and eicosapentaenoic acid, which is also known as EPA. This maintains equine joint flexibility, promotes a healthy glossy coat, boosts your horses immune system, can work as an anti-inflammatory, has anti-allergic properties and encourages a strong metabolism.