b12 injection prefilled syringe Cyanocobalamin (B12) 1000 mcg/mL, Multiple Dose Vial 30 mL Choose a cost Choosing the Right Needle and

Common effects usually mild and often worst during titration include nausea, vomiting, diarrhea, constipation, abdominal pain, upset stomach, headache, and fatigue

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Another study found that men who took vitamin B6 and B12 supplements were more likely to get lung cancer especially if they smoked

Pernicious anemia occurs more commonly in people who already have diseases that are linked to immune-system abnormalities, such as Graves disease, hypothyroidism (under-functioning thyroid gland), thyroiditis (inflammation of the thyroid), vitiligo, and Addison's disease (adrenocortical insufficiency)