how and where do i give a vitamin b12 injection Shots at Home: How, & Often to Inject Yourself Instruction Guide for Intramuscular (IM)
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Vitamin B12 deficiency can occur due to many reasons, mainly improper diet or you have a condition where your body cant absorb as much

An economic model of the costsaving potential from increased utilisation of oral versus intramuscular vitamin B12 maintenance therapy for Alberta seniors (Provisional abstract)

Light is the main risk factor and UV light will destabilise them - but how quickly I don't know
