You can use SPF 100 on your face, and in some cases, it may offer better protection than SPF 50, especially if you don't apply sunscreen properly. A 2018 study showed that participants who used SPF 100 on one side of their face and SPF 50 on the other side experienced better sun protection with SPF 100. However, SPF 100 sunscreen can sometimes be thick and uncomfortable, so many people prefer to reserve it for high UV index days or when they'll be spending extended periods outdoors.
It's important to note that the SPF number only measures protection against UVB rays, which cause sunburn. It doesn't account for UVA rays, which cause premature aging and skin cancer. Therefore, even with SPF 100, it's crucial to choose a broad-spectrum sunscreen that protects against both UVA and UVB rays.
Ultimately, the best SPF for your face depends on your individual skin type, lifestyle, and the level of sun exposure you expect.
