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A B12 shot gets absorbed gradually as the muscle tissue releases the nutrient into the bloodstream over hours to days

24 In a clinically symptomatic patient with specific features of B 12 deficiency, order a B 12 test, see Figure1: B 12 Test Result Review and Process Algorithm for Patients with Risk Factor for B 12 Deficiency* and/or Non- Specific** or Specific Symptom of B 12 Deficiency for more detail

You can only get it naturally from animal products like meat and dairy

Other ways to raise your B12 If injections are not right for you, there are other options: oral B12 tablets or sublingual drops, more B12-rich foods like fish, eggs, and fortified cereals, or a full weight loss program that combines nutrition, activity, and medical oversight