NAF EnerG. NAF EnerG is an iron rich, fast acting supplement that can help to support the performance of hardworking equines athletes. NAF EnerG is rich in Iron and also provides the correct balance of copper and zinc which are both important in helping the horse maximise the benefits of supplementary iron. NAF EnerG contains a high spectrum of Vitamin B complexes, Vitamin C for its antioxidant qualities and also Vitamin K. NAF EnerG offers a great peppermint taste for palatability.