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Possible Side Effects Mild side effects of Vitamin B12 may include: ( 12 ) Mild pain, itching, or swelling at the injection site Temporary nausea or headache Mild diarrhea Hot flashes Vomiting These side effects do not affect all patients and are generally temporary and mild While rare, more serious side effects of Vitamin B12 injections can include ( 12 ): Irregular heartbeat Heart palpitations Hives or skin rash If you notice any severe reactions to a Vitamin B12 shot, contact a medical professional immediately

Knowing which tier you are looking at is the only way to make sense of the numbers

Aug 15 2006;229(4):531-4

In fact, since B12 deficiencies can lead to mood changes, proper supplementation often helps improve mood-related issues

Importantly, do not discontinue GLP-1 or GIP/GLP-1 therapy solely to donate blood