NAF Life-Guard Tonic is a nutritional prebiotic, antioxidant and vitamin supplement formulated as a liquid feed to be added to drinking water for chickens and poultry. The patented formula of prebiotics, antioxidants and vitamins ensures a healthy gut environment and vital growth of natural micro flora. Life-Guard Tonic is natural supplement that will improve the diet, support the immune system and maintain healthy birds, at all stages of life.