H&Z INDUSTRY CO., LTD was established in 1994. As one of the 5 hydroxytryptophan manufacturers and suppliers in China, H&Z Industry and our branches are supplying thousands tons of premium products annually. You can rest assured to buy 5 hydroxytryptophan from us. H&Z Industry Co., Ltd. has achieved rapid development, from the initial small factory to a one-stop purchaser and service provider. Suitable for many customers all over the world. Welcome friends and customers from home and abroad to visit our factory and cooperate with us, hope we can get double-win.