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It's probably vitamin B12. Your body can't retain it well--it goes from your stomach straight through your bloodstream, straight to your kidneys and into the toilet, and it's BRIGHT yellow.
In fact, when I worked for a vitamin company many moons ago, I had a customer call to cancel his regular shipment. He was sad about it, because he liked the vitamins. But he had to cancel because the vitamins were staining his underwear...
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