1. Open WeChat and search for the official WeChat account of Nanjing Tongrentang Green Gold Home.
2. Select "Anti-counterfeiting Query" on the official account page of WeChat.
3. Find the security code on the package, enter it and click Query.
4. If you can't find the product number information, it may be counterfeit.
The above steps are for reference only. It is suggested to obtain more information about the authenticity of products from official website or other official channels.