Reiterating for clarity:
Uploader here.
This is the original groups upload, but they don't want their group name on it due to DMCA concerns. This is not a snipe or anything of the sort. Just reuploading without watermarks and without a group name attached to the upload. Sorry for the bad communication.
The vampires all suffer from pellagra, which is a result of a lack of vitamin B3 (niacin) exposure, and nixtamalized corn produces a more easily digestible version of tryptophan (which niacin is synthesised from in the body). All in chapter 22 btw.