Yin Chiao Plus Liquid Extract has been used for thousands of years in China as an effective treatment for colds and flu. The formula contains over 10 herbs including Isatis Indigotae root, which helps to break down phlegm and relieve coughs. Western medicine uses antivirals such as Oseltamivir, Zanamivir, Amantadine, Rimantadine and Relenza to treat influenza. However, these drugs are only effective when taken within 48 hours of symptom onset. In contrast, Yin Chiao Plus Liquid extract works immediately to reduce fever and alleviate symptoms. 1 fl oz (30ml).