Vampires

So pee is filtered blood. Well more specifically toxins and salt that comes from blood which kidneys turn into urine, Would it be possible for vampires to get their nutrience from pee? Well there's nothing saying what parts of blood is essential. In my opinion, yes, vampires can drink pee but it couldnt be the only thing they consume to thrive. They would probably need actual blood as well as pee? HOWEVER, if I were a vampire, i would not be drinking pee, and if i were a vampire that would be so cool. I also dont think any vampire would drink pee, unless they really dont want to harm people or animals.