Submitted by nateblackmt t3_11a9tvk in askscience
CrateDane t1_j9v2u3r wrote
Reply to comment by BizzarduousTask in Why is urine yellow? by nateblackmt
Riboflavin, AKA vitamin B2, is intensely yellow and water-soluble, so whatever your body doesn't need just colors your urine.
It's even used as food coloring sometimes.
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