Can sunscreen still be used after one year? Sunscreen is no longer effective after one year.

With the coming of summer, many girls have started to prepare sunscreen. Many girls have not used up last year's sunscreen, which makes people curious, can sunscreen still be used after a year?

Can I still use sunscreen after one year?

Sunscreen cannot be used after one year because the sunscreen ingredients in sunscreen are very unstable. These ingredients will easily change when exposed to oxygen and light, so we usually need to reapply sunscreen 2 hours after applying it. Although the sunscreen will not have side effects on the skin one year after opening, its sun protection effect will be greatly reduced. The sunscreen will basically not be able to provide the marked sun protection value. It is easy to get tanned when using such sunscreen, and it is even more likely to get sunburned if you go to places with strong ultraviolet rays. I believe many girls will ask, can the unopened sunscreen from last year still be used this year? What needs to be stated here is that the unopened sunscreen can still be used as long as it has not expired.

How long does it take to use up sunscreen after opening?

After opening, sunscreen should generally be used up within one year. In fact, many girls will use several bottles of sunscreen in one summer. When choosing sunscreen, you should choose according to your own needs. Don’t buy it just because it is new to you. In the end, you will use this bottle of sunscreen and then that bottle, resulting in unused sunscreen. Finally, there will be opened sunscreen at home the next year.