The UVA star rating system measures how effectively sunscreen absorbs UVA rays compared to UVB rays. In simpler terms, it measures how well a sunscreen protects against the sun’s UVA rays. The scoring ranges from 1-5 stars, 5 stars being the most effective. This rating is easy to find and will often be on the front of the bottle.
UVA and UVB rays are both emitted by the sun, but cause different kinds of damage. Different protection must be used to defend against both types of rays.
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