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is 1000 mg of b12 too much

A 23-year-old female asked:
Dr. Gurmukh Singh
49 years experience Pathology
Not likely: If you had sex since your last period, you may do home pregnancy test. If the result is negative repeat the test 4-5 days later unless you get a perio ... Read More

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A 27-year-old male asked:
Dr. Su Fairchild
24 years experience Integrative Medicine
Not too much: 500 mg of B12 is fine. But beware that B12 can compete with folate (folic acid) for absorption, so take some folate (folic acid) too. Metafolin is goo ... Read More
A 49-year-old member asked:
Dr. Emad Mousa
23 years experience Obstetrics and Gynecology
Vit.B12 in pregnancy: Yes 1000 mcg is too much, recommended dose usually 2.5 mcg, i recommend prescribed prenatal vitamin.
A 32-year-old member asked:
Dr. Rowena Desailly-chanson
27 years experience Neurology
Check levels first: As a supplement or replenishing a B12 deficiency? I would check the B12 levels first to make sure. Unless you have no meat intake or have difficul ... Read More
A 31-year-old member asked:
Dr. Rex Mahnensmith
A Verified Doctor answered
A US doctor answered Learn more
B12: If taken daily, it is a very high dose. B12 is typically nontoxic but can have side effects at high doses. If taken once a month, then the dose is f ... Read More
A 44-year-old member asked:
Dr. Su Fairchild
24 years experience Integrative Medicine
No: B12 is safe and has no known toxic dose. 5000 mcg may be more than you need, but it will not harm you.
A 33-year-old member asked:
Dr. Andrew Lipton
30 years experience Holistic Medicine
B12: B12 is water soluble and can be taken in relatively high doses without harm.
A 59-year-old female asked:
Dr. Gurmukh Singh
49 years experience Pathology
Yes: A person needs less than 5 microgram of B12 a day. if you are deficient and can not absorb B12 in your intestine talk to your doctor about sub-lingual ... Read More
A 39-year-old member asked:
Dr. Louis Esquivel
35 years experience Holistic Medicine
Maybe: The recommended daily allowance for a health adult is only 2.4 micrograms but depending on other health circumstances such as pernicious anemia or oth ... Read More
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A 43-year-old member asked:
Dr. Michael Dugan
Specializes in Hematology
No: Inefficiently absorbed and no down side to "too much".
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