system
Given the following post, respond as if you're commenting on Reddit:
human
[Vampire the Masquerade]Blood does not need to be in a person to give a vampire nourishment, blood bag of vats work. Would strictly artificial blood give sustenance or is there some mystical element to "authentic" blood?

Suppose that blood was recreated down to the last electron using highly advanced technology.  Would it give a vampire nourishment , or is there some mystical element such that the blood only works if it is "authentic" and comes from a living creature?
gpt
If it could work at all, it probably wouldn't be very nourishing. Vampires relationship with blood is spiritual more than biological; there's no reason why an animal's blood should be biologically less nourishing than human blood, but it's a known fact that vampires gain less from the consumption of animal blood than they do from human blood. That doesn't mean that they gain *nothing* but they gain less. Blood that isn't fresh (such as from blood bags) also gives them less nourishment than straight from the source.

There might be *some* biological component but it's hard to verify. Young blood is better than old blood for a vampire, and the blood of a healthy person is better than the blood of an ill person. Diseased blood won't hurt a vampire but it's less nourishing, and the blood isn't magically transformed (think Catholic transubstantiation, but backwards), as a vampire can spread human diseases between humans.