giving b12 injections to cats for How to Give a Cat
Description
Studies in Amazonian children reported a vitamin B 12 deficiency prevalence of 4.2%, with a significantly higher rate of 13.6% in children under 24 months
I discovered on looking through these that it was flagged on a couple of tests as being "RBC's anisocytic mormochrmic"

Legally, AOD-9604 remains unapproved by the FDA and is banned in competitive sports under WADA guidelines, though it is available via compounding pharmacies and research suppliers

It takes more than 12 months for his symptoms to resolve
