Vitamin B12 side effects are uncommon. However, some of the possible side effects may include: Diarrhea; Blood clots in the legs; Feelings of swelling over the entire body; Signs of an allergic reaction, such as: Hives or a rash; Itching; Swelling of the lips, mouth, or throat; Wheezing or other difficulty breathing.
If you think that Vitamin B12 is making you feel jittery, please do talk to your doc who prescribed the med.
Take care, best wishes!
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