While Vitamin B12 injections are generally well-tolerated, some individuals may experience minor reactions like redness at the injection site, dizziness, or mild headaches
Vitamin B12 Deficiencies and Medications About 10% of the population appears to have normal serum B12, however, their bioavailable B12 is reduced
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Clinical manifestations tend to be subtle and mild,2 although progression to more severe form, like pernicious anaemia (PA), can still occur in a minority of patients.26 Pernicious anaemia, a result of autoimmune atrophic gastritis (type A atrophic gastritis), is most often diagnosed in the elderly
Some people have an MTHFR gene mutation