are vitamin b12 injections painful

What are the side effects of B12 injections for low levels? https://irp.cdn-website.com/c01262ca/dms3rep/multi/20220+cpt+code-65b6d608.png digestive Neurotransmitter Synthesis – B12 enables creation of “feel good” chemicals for mood like serotonin, dopamine, and norepinephrine Treatment:6 Months

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