I think the reason children are consumed is due to the stem cells. I think they may have astonishing health effect, known to man throughout the ages but, for obvious reasons, enormously taboo.
I’ve read a little about adrenochrome also. Only produced when the victim is terrorized, they say.
Creepy stuff.
There's the adrenochrome and the blood itself...and the histamines, endorphins, serotonin, and who knows what.
But then there's the value of the sacrifice to those things on the other side.
That's not about chemicals...that's about something very different.