any side effects from vitamin b12 injections Common & Rare of What Are B12 Shots? 5
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Oral supplements pass through the digestive tract to be absorbed by the bloodstream, and much of the nutrient is lost in this process
doi: 10.1111/j.1365-2125.2009.03453.x
It is within the cell that it is used for energy production and methylation of myelin and neurotransmitters
