how to give a vitamin b12 injection in the arm Inject an Injecting B12 What happens when
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So long as you havent had a B12 injection in the past 28 days and arent scheduled to have one in the next 28 days you can purchase a voucher for the B12 service

Moisten a cotton ball with rubbing alcohol and use it to wipe the skin at the injection site

As a result, you can get more B12 with injections than with oral supplementseven if you take higher oral doses
Do not use the vial beyond its labeled expiration date