is it legal to inject vitamin b12 yourself united states How self-inject intramuscular - Overview Compounded Cyanocobalamin (Vitamin B12) Injection
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The process will be explained to you & consent will be taken

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6 It is taken up by cells in larger amounts per unit time and is better retained in the body than cyanocobalamin

Correlations between maternal, breast milk, and infant vitamin B12 concentrations among mother-infant dyads in Vancouver, Canada and Prey Veng, Cambodia: An Exploratory Analysis

However, this may vary slightly depending on the lab
