1. Choose formal channels: choose reputable pharmacies, hospitals or professional health care products sellers, and give priority to purchasing through official authorized channels, so as to avoid purchasing from unqualified online shopping malls or individual sellers, so as to avoid encountering counterfeit and shoddy products.

2. Product certification and accreditation: Check whether there are relevant certification and accreditation marks on the product packaging, such as the approval number of the State Administration of Pharmaceutical Products, which is an important reference for judging the authenticity of the product.