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Is high vitamin b12 dangerous

A 31-year-old member asked:
Dr. Lewis Dickinson
Internal Medicine 50 years experience
Ingesting much B12.: No known adverse effect of too much vitamin B12 in blood. You may not need to take any b12.
Dr. Randy Baker
Holistic Medicine 40 years experience
Needs evaluation: B12 is not toxic so high B12 due to taking it is not bad. If someone has high B12 without taking it then it can be a sign of serious problems includi... Read More

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A 39-year-old member asked:
Dr. Thomas Namey
Rheumatology 48 years experience
Nothing.: None toxic and will simply be urinated out, after your body's stores are filled. I take 2500mcg/day! for years!
A 23-year-old female asked:
Dr. Milton Alvis, jr
Preventive Medicine 41 years experience
Intake + Absorption: Vitamin b12, aka cyanocobalamin, is common in a huge variety of foods; low intake rare. However, none of us absorb B12 directly. Instead, the cells of... Read More
A 38-year-old female asked:
Dr. Julie Abbott
Preventive Medicine 45 years experience
Nothing definitive: A few studies have been done which show influence in both directions: post-menopausal women who took vitamin B12 (and other) supplements showed increa... Read More
A 65-year-old female asked:
Dr. Bennett Machanic
Neurology 52 years experience
Comments: Am not personally troubled when my patients' B-12 comes back elevated, as it is truly unlikely that there will be any problem in near or distant futur... Read More
A 27-year-old female asked:
Dr. Ed Friedlander
Pathology 44 years experience
No: This should not cause any concern at all if you are otherwise well. Some folks run a little bit high levels of the carrying protein.
A 24-year-old male asked:
Dr. Randy Baker
Holistic Medicine 40 years experience
The other way around: Vitamin B12 is not known to be toxic in any amount. However, one of the causes of high blood levels of B12 is liver disease including hepatitis ; cirr... Read More
A 30-year-old member asked:
Dr. Clarence Wimberly
Specializes in Family Medicine
Vit. B12: B vitamins do not stay in your body and if not used by you they are excreted in the urine, therefore excessive amounts of B12 will not hurt you.
A 28-year-old female asked:
Dr. Rex Mahnensmith
A Verified Doctoranswered
A US doctor answeredLearn more
High b12: This is not uncommon in my experience. It means your intake has been sufficient. Be thankful. There is no toxicity.
A 50-year-old member asked:
Dr. Ed Friedlander
Pathology 44 years experience
Not much: High B12 is never worrisome. Low platelets, especially if below 100,000, need to be addressed with a physician who knows how to do a differential diag... Read More

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