Herbal Biotic is a powerful combination of immune enhancing herbs, bioflavonoids and vitamins.* The vitamins and mineral in the formula (Vitamin A, Vitamin C, and Zinc) are well-known for their roles in normal immune function.* The herbs and bioflavonoids provide high levels of antioxidant activity and support the body's natural defenses.* This synergistic formula promotes upper respiratory and sinus health.*