Pure Phosphatidylserine Powder suppliers About Guanjie Technolgy Shaanxi Guanjie Technology Co.,Ltd was invested and established in 2009 by Xi'an Guanyu Bio-technology Co.,Ltd which was established in 2004. Guanjie is a Hi-tech private enterprise specializing in the research, development, production and sales of natural plant extracts and Chinese traditional medicines to serve customers in the...