Welcome to Shijiazhuang Zhengran Biotechnology Co., Ltd., established in 2016 with a registered capital of 500,000 RMB. Located in Zhengding County, Hebei Province, we are a specialized manufacturer of adhesive products, integrating R&D, production, sales, and OEM/ODM customization. With over a decade of experience, we focus on three main categories: self-heating patches, hydrogel cold compress patches, and botanical oil patches. Our core offerings include a variety of self-heating products, coo