system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 What happens to sunscreen? Does my body absorb or metabolize it? Is it stored in some form?
gpt
It's absorbed into your epidermis which is a layer of dead skin cells, and reflects UV rays from there.  Trace amounts \*might\* make it as deep as your capillaries if you're regularly using copious sunscreen, but your Kidneys will, in general, make short work of those traces and it will be expelled in your urine.  Most of it eventually wears off through water, sweat or friction as your skin cells shed off.