Why pee is yellow?

Because..: ...It contains uric acid, which gives it a yellow color.

Urochromes: These are metabolites of bilirubin, mostly resynthesized porphyrin rings. They have a "colorful" journey through the body -- all have been to the liver once, and some twice with a stop-off in the large intestine first.

Yellow Pee: The reason for the color intensity of urine lies in the amount of bilirubin contained within the urine itself. When dehydrated your kidkeys and other fluid disposal systems operate at a much slower pace, thus allow bilirubin to build-up within your body and give urine a darker yellow color. Regular hydration, on the other hand, causes our body to process liquids more quickly and urine is clearer.