正光製藥 | 台灣老品牌 享譽半世紀 chengkuang Since its establishment in 1970, Cheng Kuang Pharmaceutical Co. Ltd. has been dedicated to the research and development of herbal external products for pain relief. As a self-proclaimed "expert in pain relief," we combine modern technology to provide affordable, natural, and effective pain relief products. Our products, such as Cheng Kuang Jin Si Gao (Golden Silk Plaster) and various pain relief patches, are highly trusted and recognized as a renowned Taiwanese brand in traditional Chinese medicine. Zhengguang continuously improves its quality to meet the demands of consumers.