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Doctor insights on: High Levels Of Vitamin B12 Symptoms

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Is it possible to have a vitamin B12 deficiency if your serum level is 250 p/mol? have every symptom plus high MCV and mch

Is it possible to have a vitamin B12 deficiency if your serum level is 250 p/mol? have every symptom plus high MCV and mch

As a matter of fact yes: I cannot go into the complex details, but I had two young patient's years ago, both of whom had elevated blood levels of vitamin B12. But both of them also had evidence of thiamin deficiency that would result in deficiency of energy. I concluded that vitamin B12 was collecting in the blood and not being used in metabolism. Try a supplement of thiamin and see whether the vitamin B12 levels come down. ...Read more

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Dr. Umesh Patel
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36 years in practice
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Dr. Su Fairchild
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Vitamin B12 (Definition)

Vitamin B12 is a vitamin which is a kind of nutritional agent ...Read more


Dr. Umesh Patel
Board Certified
36 years in practice
345K people helped
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What does a high level of vitamin B12 do to me?

What does a high level of vitamin B12 do to me?

Nothing.: None toxic and will simply be urinated out, after your body's stores are filled. I take 2500mcg/day! for years! ...Read more

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What causes high vitamin B12 levels?

What causes high vitamin B12 levels?

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 the upper ? of the stomach which secrete hydrochloric, hcl, acid also produce & secrete a protein, called intrinsic-factor, which binds b12. The small intestines absorb intrinsic-factor with whatever B12 is bound, & the B12 is thereby also absorbed. ...Read more

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Dr. Umesh Patel
Board Certified
36 years in practice
345K people helped
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How does one go about lowering a high level of vitamin B12 of 1000? It has been that high since 2010. My B6 is also high - 33.4.

Stop taking MV pills: Start by stopping any multivitamin or vitamin B12 & b6 supplements you may be taking. These are water soluble vitamins and should clear from your system in a short while. ...Read more

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Could a high level of vitamin B12 affect the digestive system in the body?

Could a high level of vitamin B12 affect the digestive system in the body?

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 ; cirrhosis. Liver disease certainly affects the digestive system. But it is not high B12 that causes liver disease but liver disease that can cause high B12 levels. As i mentioned earlier, other causes of high B12 include kidney disease ; blood disorders. ...Read more

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What can cause extremely high vitamin B12 levels? My result was >2,000... I thought diet and/or supplements wouldn't cause high levels.

What can cause extremely high vitamin B12 levels? My result was >2,000... I thought diet and/or supplements wouldn't cause high levels.

Needs Evaluation: Elevated levels of B12 are non-specific but can be associated with bone marrow diseases like polycythemia. Best to be evaluated by a hematologist. Thanks for trusting HealthTap! ...Read more

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Dr. Umesh Patel
Board Certified, Cardiology
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