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Symptoms and Signs of Excess Vitamin B12 True vitamin B12 toxicity is exceptionally rare, and when elevated B12 levels are detected, they are often asymptomatic and discovered incidentally during routine blood tests
Common side effects include, but may not be limited to: pain or redness at the injection site mild diarrhea pruritus (itching) increased swelling joint pain dizziness headache nervousness or anxiety Serious side effects may include: allergic reactions peripheral vascular thrombosis hypokalemia (low potassium levels) pulmonary edema (fluid build-up around or in the lungs) thrombocytosis congestive heart failure There have been reports of anaphylactic shock and death after the parenteral administration of vitamin B12
[2] When used in supplementation, all of the vitamin B 12 vitamers have been argued to be beneficial, with there not being clear evidence that any are relatively more or less effective
The Bottom Line Vitamin B12 can lift energy and mood, especially if you have a deficiency
Personal Preference: Individual preferences regarding injection frequency versus daily pill intake should also be factored in
How often should you get a B12 injection
