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 Size:10x30ml 5-Amino-1MQ 5mg | Research B12 for nerve health
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