can b12 injections cause heart palpitations Deficiency of vitamin b12:-, Causes: Include pernicious anemia (lack of intrinsic factor), vegan/vegetarian diets, malabsorption issues (like Celiac or Crohn’s), and certain medications. , Symptoms: CYANOCOBALAMIN INJECTION, USP 30000 Size:1,000 mcg C-Litter+Cleaning
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