do b12 injections help increase wbc's counts Are Vitamin Shots Right for You? Does Vitamin B12 Increase White
Description
The one constant is consistency of timing and route for a mechanism that works by gradually shifting cellular metabolism, day-to-day steadiness matters more than any single dose

doi: 10.1016/S0140-6736(10)60888-4

Almeida OP, Ford AH, Flicker L
Thankfully though vitamin B12 deficiency is pretty easy to diagnose as it just involves a simple blood test that can be sent to the laboratory and the answer will typically come back within a day or two