how long b12 injections take to work Quickly Does a Shot Work? What Expect Vitamin B12 Injections — Anupa
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They might not absorb it as well

People who have gastrointestinal disorders like celiac disease or Crohn's disease or who have undergone weight-loss surgery may secrete too little hydrochloric acid or intrinsic factor

In our practice, we offer injections and support to all patients with an identified B12 deficiency

If you inject weekly, simply alternating between left and right thigh is usually sufficient
