From the very little I remember from high school biology classes, what you get from food and supplements is actually a provitamin which gets "activated" in your body and turns into vitamin D by being out in the sun. So technically taking the vitamin D from someone whose body has already done all that work would make sense?
When I was young, I read in a magazine that vampires are based on people with a severe iron deficiency, because it causes dry and pale skin, cracked (bleeding) lips and corners of the mouth, cracked fingernails, weak teeth (maybe vampire fangs are based on people's broken teeth?), brittle hair / hair loss, and also deteriorates your mental health. Which I guess would mean that some people are driven to insanity and decide that the way to get iron is to drink blood.
But idk I also read that vampires were created by people as an analogy to the aristocracy. Hence the "bloodsucking" and also the seducer trope.
I take pills, everyone takes pills nowadays
When I was young, I read in a magazine that vampires are based on people with a severe iron deficiency, because it causes dry and pale skin, cracked (bleeding) lips and corners of the mouth, cracked fingernails, weak teeth (maybe vampire fangs are based on people's broken teeth?), brittle hair / hair loss, and also deteriorates your mental health. Which I guess would mean that some people are driven to insanity and decide that the way to get iron is to drink blood.
But idk I also read that vampires were created by people as an analogy to the aristocracy. Hence the "bloodsucking" and also the seducer trope.