It can be seen that there will be a shelf life column after the product is packaged, which is generally 12 months. In addition, if stored in the refrigerator, the shelf life will be longer. Half of them have a shelf life on the side or back, and some have two rows of dates. One is the production date and the other is the expiration date. Some have only the validity period, some have the date of production plus the shelf life, and half are n months.