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Pyunkang-Hwan is a health functional food researched and developed with the aim of maintaining good health by caring for the foremost organ of our body, the lung Dr. Seo Hyo-seok, the director of Pyunkang Korean Medicine Hospital, developed Pyunkang-Hwan as the result of more than 50 years of clinical research. It has helped over 160,000 people of various conditions related to the respiratory system.