NAF Echinacea Plus. Give your horse the extra boost they need with the NAF Echinacea Plus. Echinacea Plus helps to maintain the immune system for horses that need a little extra help such as those that are working hard, travelling regularly or facing a little challenge in their life. Echinacea is one of the main ingredients and is found to be one of the best known herbs used to help support the immune system by supporting red blood cells. Echinacea Plus offers the ideal day to day support for the immune system.