Xi'an Healthful Biotechnology Co., Ltd. (HSF) is a leading manufacturer of natural Vitamin E and Phytosterol series, with its headquarter located in Xi'an high-Tech Development Zone, China. HSF specializes in producing natural Vitamin E and Phytosterol series. HSF is devoted to self-innovated research as well as working with well-known overseas and domestic corporations and universities. Our partners include Shaanxi Normal University, Beijing Chemical University, China Agricultural ...