Personally I’d say yes, since I never understood why the victim has to be alive - as long as the blood has all the nutrients the vampire needs, and it hasn’t gone bad in some way, it should be fine.
That works for more sciency vampires, but most settings that include vampires have explicit magic. When you add magic, you can basically apply whatever rules you want for why vampires drink blood. If they’re really feeding on the victim’s life force or soul or whatever then the synthetic stuff wouldn’t cut it, and the blood itself may not even matter.
That works for more sciency vampires, but most settings that include vampires have explicit magic. When you add magic, you can basically apply whatever rules you want for why vampires drink blood. If they’re really feeding on the victim’s life force or soul or whatever then the synthetic stuff wouldn’t cut it, and the blood itself may not even matter.