We make it so that its quality does not change up to two and a half years from the date of manufacturing when the product remains unopened and preserved in a normal environment. However, contents might experience sight alterations when stored in places containing high temperatures, wide-ranging changes in the temperature, humidity, and/or direct sunlight. Please do not use the product if it smells strange when the package is opened, or if it is discoloured. Please do not store it in areas with high temperatures, humidity, or direct sunlight; use it as soon as possible after opening the package.