The iron box in Noah's mug contains medical stone, which is mainly used for drinking water and health care. Medical stone can dissolve 58 minerals such as iron, calcium, magnesium, potassium and sodium in water, which has biological activity and is easily absorbed by human body. It is a comprehensive and complete inorganic nutrient source.

When using Noah's mug, because it contains medical stone, it is necessary to pour a spoonful of soda water into the cup with warm water from time to time, open the lid for disinfection, and then wash it thoroughly with warm water.