b12 injection site nhs How to self-inject intramuscular vitamin - Overview B12 Shots at Home: How,
Description
Because rapid correction of severe B12 deficiency can trigger a surge in bone marrow activity and red blood cell production

Deficiency may cause fatigue, neurological symptoms, and cognitive changes, with treatment often improving symptoms when deficiency is present
true toxicity is rare

Wang Y, Liu X, Zhang D, Chen J, Liu S, Berk M

[DOI] [PMC free article] [PubMed] [Google Scholar] 3.Pandey A., Chawla S., Guchhait P
