There is a reason why we often can't see the shelf life of Japanese products at the bottom of coix seed water. Including this, only the production date does not indicate the shelf life, because according to Article 6 1 of the Japanese Pharmaceutical Law, only "products that will deteriorate within 3 years under normal storage conditions" must indicate the shelf life. If it is not marked, it means that the shelf life of the product in unopened state is at least 3 years.