Efavet has for a long time been the top brand of oil-based supplement for dogs with itchy skins. It is based on Evening Primrose Oil with Marine Fish Oil, along with specific vitamin & mineral co-factors, all of which are designed to provide the maximum health benefit to the skin. A healthy skin works as a more effective barrier to allergens & is better able to control potential over-growth of aggravating bacterial & fungal infections. Efavet 330mg & 660mg capsules contain balanced levels of essential fatty acids (EFAs) including GLA (an important Omega-6 nutrient) & EPA (an important Omega-3 nutrient), provided by premium quality Evening Primrose Oil & Marine Fish Oil.