This includes: Those who have had allergic reactions to vitamin B12 or cobalt before People with certain health conditions, like Lebers disease Getting a full medical history and talking to a doctor before starting vitamin B12 injections is very important
Treatment of such an overdose would be mainly supportive, since there is no specific antagonist for B vitamin excess
Typically you would be a B12 injection once a week or every few weeks, says Foxx
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Here are the best vitamin B12 injection sites for each method: Subcutaneous B12 injection sites Usually, the best places to give yourself a B12 shot subcutaneously are the abdomen, thigh, and upper arm, as you can see in this illustration: Although not shown above, the buttock is another good site for B12 shots