Im confused about if it is effective once absorbed or if it literally creates a “screen” on your skin
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Sunscreen is not absorbed, [it’s just a paint which is dark in UV part of the spectrum, and transparent in the visible one](https://www.youtube.com/watch?v=yrs3_F5uzJI), so it sits on top of your skin, absorbs UV rays while allowing most of visible light to pass, and converts UV into heat. Just like dark paint on the sun absorbs light and heats up. Mineral sunscreen also reflects a couple of percent of light, but not all contrary to what other users might have have said, it’s an old myth.
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