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Untreated and persistently high levels of B12 could result in complications like an increased risk of death in older adults. Vitamin B12 injections can cause serious side effects such as low potassium, heart failure, blood clots, or fluid buildup in the lungs. Save on prescriptions for too much B12 with a SingleCare prescription discount card.
High blood levels of B12 are rare. If your levels are high, you might not know it unless you visit a doctor and have a B12 blood test. Although there are a few potential side effects from any dose of B12, it carries little risk of causing serious symptoms or side effects, even at very large doses.
Another possible cause of elevated vitamin B12 levels is a blood disorder (QJM, June 2013). Some people with high vitamin B12 levels are at greater risk for liver or pancreatic cancer (Cancer Epidemiology, Biomarkers & Prevention, April 2019).
Therefore, hypercobalaminemia (or, high serum vitamin B12 levels) may be a warning sign of some serious underlying pathology: The aetiological profile of high serum cobalamin predominantly encompasses severe disease entities for which early diagnosis is critical for prognosis.
Because of the ill effects that can develop from not getting enough vitamin B12, it’s essential to have your levels tested by a healthcare provider, eat more foods with the nutrient, or take supplements if you find you are low in the vitamin.
If you take too much vitamin B12, you may suffer from nausea, vomiting, headache, diarrhea, tiredness or weakness, and tingling. Vitamin B12 plays an essential role in many of your body's functions.