A Goodreads user
A Goodreads user asked Deborah Harkness:

In Discovery of Witches, when Matthew puts a drop of his blood in Diana's mouth it acts as a sedative/puts her to sleep. In Discovery of Witches, when Matthew put a drop of blood in Queen Elizabeths mouth, to rub on her gums, it eases her pain but does not put her to sleep. why is that?

Deborah Harkness Because, in my universe, vampire blood has healing and restorative power.

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