There is SOUL ENERGY in the blood. There is MAGIC in the blood. Stop applying peasant science to what these ((people)) do. The chemistry is irrelevant.
I did a dig on this a long time ago. People on the druggy forums have tried to get high off lab created adrenochrome. It doesn't work very well at all.
Young blood. Virgin blood. The blood of the innocent. Like little Haitian kids. If all they needed was any old blood, they're bodies already have 9 pints.