NAF Electrolytes. NAF Electro Salts is a supplement which replaces the essential mineral salts (electrolytes) which are lost during exercise when the horse sweats. Fatigue as well as muscle, bone and cartilage damage can be avoided by replacing the essential salts of sodium, potassium, calcium, chloride and magnesium, all of which are present in NAF Electro Salts. It also contains dextrose to speed up absorption. NAF Electro Salts are best used after strenuous exercise or in periods of hot weather.