Luotian Hengxingyuan Chemical Co., Ltd. now is the largest "MELATONIN" production enterprise of China. Now, we are specializing in the R＆D, production and technical cooperation of APIs, pharmaceutical intermediates, materials of health care products, food and feed additives. There are top-notch professionals and advanced testing equipments in our company, and we conduct the production strictly in accordance with the GMP standards. Thus, we got the certificate of ISO9001:2000 quality system in March, 2005 successfully. At present, our products, with world-top quality, are well sold in EU, USA and Southeast Asia. Sticking to the principle of "quality ＆ credibility first，service ＆ mutual-benefit first", upholding the tenet of "honesty, fairness, cooperation and development" and ..