Scientific, yes. And it is comparable. A vampire could sustain themselves on it alone, however for most the taste is... lacking. It is primarily the younger ones among us who still have memory of human food that best adapt to drinking it.

( he does not have a shortage of willing humans throwing themselves at his feet whatever their reasons. few know his age, but everyone who has set foot in his presence understands his power. he wears it unselfconsciously. )