Stila Cosmetics typically provides a shelf life of about three years for most unopened products. However, once a product has been opened, it is advisable to use it within twelve months for optimal performance and safety. It is important to check the packaging for specific expiration dates or Period After Opening symbols, often represented by an open jar icon with a number inside. This symbol indicates the number of months the product is effective after being opened. Additionally, storage conditions can affect the shelf life, so keeping products in a cool, dry place away from direct sunlight will help extend their longevity. For the most accurate information regarding specific products, it is always best to refer to the labels or the current website of Stilacosmetics.com.