what are vitamin b12 injections given for The Advantages of Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine Benefits of Vitamin B12 Injections
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Some payers limit how many times it can be billed in a single day

In rare instances, repeated injections of certain lipotropic components have led to inflammation or small nodules forming under the skin at the injection site

The metabolism and clearance of both components may be affected by significant liver disease, and patients with severe hepatic impairment should be monitored closely if treatment is deemed necessary

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However, allergic reactions to B12 shots are extremely rare
