1. Observe the package to see if there is any information such as factory name, address, production date, shelf life, batch number, implementation standard, quality certificate or inspection report, anti-counterfeiting mark or scratch code.
2. Observe whether the product has abnormal conditions such as color, smell, taste, precipitation, caking and deterioration, and whether there are instructions or labels.
3. Consult the official flagship store customer service. For example, this probiotic is sold on the platform of JD.COM.