What are the official authorizations of Yi Yanshi?

Huadong medicine, Diane medical beauty clinic and so on.

Ellansé Yi Yan is a facial filler of polycaprolactone microspheres for injection of medical beauty products. When Ellans is injected into subcutaneous tissue, CMC gel provides real-time filling effect and smoothes the depression. After the degradation and absorption of CMC gel, PCL microspheres continue to stimulate fibroblasts and induce the regeneration of autologous collagen. As PCL microspheres are gradually absorbed by human body, new collagen replaces the original microspheres. The filling of Ellans' Yi Yan poems is to thicken the dermis, fill the depressions and smooth the lines through this process.