The best way to store The Ordinary products is at room temperature in a cool, dry place away from direct sunlight. Some products, such as The Ordinary Granactive Retinoids/Retinols, do require refrigeration after opening. This requirement is outlined in the product's directions. Other products may be stored in a refrigerator if desired, although not required. To ensure that delicate ingredients are not compromised, it is important to make sure that lids and caps are tightly closed on all containers and bottles when not in use. Additionally, users should take care to avoid introducing contaminants into their skincare products by storing them away from sources of heat or moisture.