The shelf life of sunscreen spray is usually two to three years. Most people think that there is no problem if they don't open it within the shelf life, and they will use it within one year after opening it. This is a very wrong idea.
Myth: Usually, the essence with more active ingredients is recommended to be used within half a year after opening to avoid oxidative decomposition of some ingredients.
Dr. Ni Xiling from the Plastic Surgery Center of Xuzhou Third Hospital told you that the sunscreen ingredient in sunscreen is a rather unstable ingredient, which is easy to change when exposed to oxygen and light. The reason is that the sunscreen needs to be repaired is because the sunscreen is exposed to air and sunlight in a large area on the face, and the failure rate reaches the maximum, so the concept of repairing sunscreen has come into being. Then after the sunscreen is opened, it is also exposed to oxygen and sunlight in the bottle, but the failure rate is much slower. So if you really want to reach the SPF value marked on the sunscreen, you must use it within six months after opening it.