Does sunscreen have a shelf life? Can expired products be used?

Does sunscreen have an expiration date? Does everything have a shelf life? Some things cannot be used once their expiration date is reached, but some things can be used even after their expiration date. So, does sunscreen have a expiration date? What is the shelf life of sunscreen?

Does sunscreen have an expiration date?

Sunscreen also has a shelf life. Generally speaking, its shelf life is about one year. After this shelf life, it loses its sun protection function. It is useless to apply it on the body at this time. On the contrary, it may clog the pores, which is harmful to the human body. Generally, the shelf life of unopened sunscreen is three years, and some sunscreens can last up to five years.

What does sunscreen do?

The main function of sunscreen is to prevent ultraviolet rays from directly exposing the skin and reducing pigmentation. Sunscreen is a cosmetic that girls need all year round. Sunscreen is divided into physical sunscreen and chemical sunscreen. Physical sunscreen uses sunscreen particles to form a protective film on the surface of the skin to prevent ultraviolet rays from directly hitting the skin.

How often should you apply sunscreen?

When in a sunny environment such as the beach, reapply every 30 to 90 minutes.

Since it takes time for sunscreen to form a protective film, it is generally best to apply sunscreen to exposed areas of the face, back and upper limbs 30 minutes before going out, and try to avoid going out when the sun's ultraviolet rays are strongest (10 a.m. to 3 p.m.). It is easy to sweat in the summer and the sunscreen can be washed off easily, so it should be applied every two hours.

How to apply sunscreen

1. The skin must be cleaned before use: Before using sunscreen, clean the skin first to avoid clogging of pores.

2. Moisturize your skin with moisturizing water first: After cleansing your face, even if you choose a sunscreen that has a good moisturizing effect, do not apply it directly on the cleansed skin.

3. You should first moisturize your skin with the moisturizing water you use daily, which will allow the skin to lock in moisture.

4. When using, do not apply it directly on your face. Instead, apply it on your hands first. After spreading it evenly, use your fingers to apply it on your face little by little. This will make it more even.