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: Common signs are fatigue, weakness, numbness or tingling Feline Anemia Support Size:1000 mcg/ml - 30 ml (Pack of 4) What Causes B12 Side
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