Excellent for Martial Art. Actions. Temporarily relieves minor aches and pains of muscles and joints due to: simple backache, rthritis, sprains, bruises sprains. ZHENG GU SHUI is produced by Guangxi Yulin Pharmaceutical. Founded in 1956, Guangxi Yulin Pharmaceutical is one of China's fifty top-rated pharmaceutical industrial enterprises, with more than 700 employees, including 200 technicians. This ancient remedy meets the Chinese and Australian Good Manufacturing Practices standard.