The complexity of the poultry respiratory system means they are prone to a range of problems. High stocking density, extreme temperatures and humidity, dust in coop, etc. are all the factors causing respiratory issues. According to thousand years’ experience from our ancestor, we learned medicinal plants are advantageously used in the treatment of respiratory tract diseases. Rezyfresh is composed of Isatidis Radix and Licorice, those are usually used as the treatment and prevention for virus-related respiratory diseases on human beings. The most important feature of Rezyfresh is the process of extraction is rigorous for only retaining the specific active ingredients to make sure the efficiency.