is it safe to take b12 injections The Shot: What Every Human Needs Know About Injectable Vitamin B12 Vitamin B12 Injections - Vie

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The effect of vitamin B-12 supplementation on maternal plasma concentrations during pregnancy is shown in Figure 2

There was no change in heart rate in placebo-treated patients

CDC.gov states: Aspiration before injection of vaccines or toxoids (i.e., pulling back on the syringe plunger after needle insertion but before injection) is not necessary because no large blood vessels are present at the recommended injection sites, and a process that includes aspiration might be more painful for infants (ACIP Vaccine Administration Guidelines for Immunization | Recommendations | CDC, 2018)