h2 blockers and b12 injections Causes of Vitamin Deficiency, 1. Inadequate Intake, 2. Malabsorption (Gastric causes), 3. Malabsorption (Intestinal causes), 4. Bacterial Overgrowth or Parasite, 5. Drug-induced, 6. Genetic / What Is the Effective Injection Therapy Size:.5 Gram
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