Ever since I have started taking a vitamin, a little over a month now, my pee has been extra yellow. Only when I take the vitamin though. If I forget a day, my pee isn't yellow. Is there something inside of the vitamin that is doing this?

Vitamin B makes your urine fluorescent yellow. Are you taking B? I don't know why it does this, but it does.

I am taking a multi-vitamin. I would guess that it has vitamin B in it.