... the wound intention is slow;immune function is descending;cause to high blood pressure.......It is usual pheomenen exists our life ... ill. Such as: low intelligence,low immune function,want not to eat,midge,sex function is descending etc. The zinc will increase ... our factory----citric acid zinc.Our products now have sold to Beijing,Shanghai,Jiangsu,Liaoning,Xinjiang,Yunnan,Sichuan,Shandong,Hebei,Shanxi ...