Main ingredients: The tiny particles in physical sunscreen are generally composed of titanium dioxide and zinc oxide. For chemical sunscreen, salicylate, cinnamate and anthranilate are considered as safe and non-irritating sunscreen ingredients.

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Some misunderstandings in using sunscreen;

Myth 1: Ultraviolet rays are very strong only at very hot and very high temperatures. Reality: Ultraviolet rays don't give off heat. For example, when people climb mountains, the higher they go, the cooler the mountain wind and the stronger the ultraviolet rays. Every upward 1000 meters, the ultraviolet ray is enhanced 10%. The same is true in the sea: the sea breeze makes you feel cool, but the ultraviolet rays have reached a very strong level at this time.

Myth 2: When the clouds are thick on cloudy days, ultraviolet rays will not harm the skin. Reality: Clouds can hardly isolate ultraviolet rays. 90% ultraviolet rays can penetrate clouds, and only dark and big rain clouds can block some ultraviolet rays.

Myth 3: The higher the SPF of sunscreen products, the better for the skin. Truth: The higher the SPF, the more sunscreen you add, and the greater the irritation to the skin. So if you go to work normally, you can choose SPF 15 and PA+ products. For outdoor sports, choose SPF25~SPF35 and PA++ products. If you are swimming at the seaside, you can choose SPF35~SPF50 and PA++.

References:

Baidu encyclopedia-sunscreen