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Astra Isatis combines Isatis (Da Qing Ye/Ban Lan Gen), an herb with strong anti-bacterial and anti-viral properties, with Qi, Yin and Yang tonics. The formula is designed for patients with weak constitutions who are prone to many infections. The cooling and warming properties of the herbs are balanced in Astra Isatis to provide long-term therapy for chronic viral infections which tend to exhaust the Qi and Yang. The formula contains herbs that help calm an overactive metabolism and inhibit the agitating effects of pathogenic organisms. It includes spleen and kidney tonic herbs chosen for their immune enhancing properties and their ability to reduce inflammations.