every search for iron & b12 shows up with studies about elevated b12, not low b12.
and the only hits regarding b12 storage are affirmations that the liver can indeed store b12.
what that suggests, at the least, is that if i'm having some kind of regulation issue then it's extremely obscure and it could take some time to convince a doctor that i even have it.
can i at least figure out which hormone regulates b12 storage and release?