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is 500 mg of b12 too much to take

A 46-year-old member asked:
Dr. Louis Esquivel
34 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 50-year-old member asked:
Dr. Michael Dugan
Specializes in Hematology
No: Inefficiently absorbed and no down side to "too much".
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A 42-year-old member asked:
Dr. Andrew Lipton
29 years experience Holistic Medicine
B12: Yes, B12 is safe and water soluble, excess will be removed in urine.
A 54-year-old member asked:
Dr. Ed Friedlander
43 years experience Pathology
Rapid: If you are B12 deficient, the anemia will improve and reticulocyte count rise within a week. If your have a neurologic deficit, you'll notice an impro ... Read More
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A 37-year-old member asked:
Dr. Thomas Namey
47 years experience Rheumatology
Yes, but...: It is too much, unless you have severe absorption problems, but 2500mcg should solve that. You will pee out the excess since it will shortly saturate ... Read More
A 36-year-old male asked:
Dr. Eric Weisman
35 years experience Neurology
There is a toxicity: state with Vitamin B6 but not B12 . B12 is present in a lot of different foods but absorption requires a complex mechanism. Generally speaking the wat ... Read More
A 35-year-old female asked:
Dr. Derrick Lonsdale
72 years experience Preventive Medicine
Yes it is safe: But my question is why you are taking these doses. Raising the serum level does not really matter at all. It is the intracellular level that matter ... Read More
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A 26-year-old female asked:
Dr. Randy Baker
39 years experience Holistic Medicine
Yes, no toxicity: Yes, it's safe to take more but it's very unusual to need more. Vitamin B12 is considered to be non-toxic so there is no known dose that is "too much. ... Read More
A 42-year-old member asked:
Dr. James Ferguson
45 years experience Pediatrics
Probably: I believe 72 mg is the highest dose approved by the FDA. Some practitioners use products off label, meaning they try amounts not previously approved, ... Read More
A 34-year-old female asked:
Dr. Ed Friedlander
43 years experience Pathology
No: It's very safe. If you are taking it as an oral supplement, be sure you are able to absorb it by this route -- many people who are deficient cannot. Y ... Read More
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A 35-year-old male asked:
Dr. Su Fairchild
23 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 41-year-old member asked:
Dr. Steven Charlap
36 years experience Holistic Medicine
Depends: From food, no, from supplements maybe. Calcium in supplements has been linked to calcification of arteries so its okay to get calcium from food but av ... Read More
A 34-year-old female asked:
Dr. Gurmukh Singh
48 years experience Pathology
See below: Unless you are a strict vegetarian, B12 deficiency suggests problem with absorption of food stuffs and that can explain other symptoms as well. If you ... Read More
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A 53-year-old member asked:
Dr. Susan Wingo
32 years experience Endocrinology
1500-2000 mg/day: At least 1500 mg of calcium per day from foods rich in calcium and supplements. It is also very important to ensure vitamin d levels are kept normal. ... Read More
A 27-year-old female asked:
Dr. Kathleen Saradarian
33 years experience Family Medicine
Yes: Vitamin b 12 is water soluble. That means that you can not build up and store high levels, you urinate out any extra that you might ingest. So you c ... Read More
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A 62-year-old female asked:
Dr. Gurmukh Singh
48 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 43-year-old female asked:
Dr. Matthew Cahill
24 years experience Internal Medicine
Ask your doctor: Postural Orthostasis maybe helped by florinef (fludrocortisone). As it seems you know it is not without risk. You need and deserve to have a full co ... Read More
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A 38-year-old member asked:
Dr. Randy Baker
39 years experience Holistic Medicine
Probably no unless: If you literally mean 2000 mg that is a very toxic dose, as 2000 mg = 80 million iu of vitamin d! however, I have a feeling you are asking if 2000 i ... Read More
A 41-year-old male asked:
Dr. J. Lawrence Dohan
56 years experience Dermatology
Wrong question: Why ask this? There is no toxic dose of B12. You will absorb only a tiny fraction of these very large doses. Why are you taking it? Most of the time ... Read More
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A 28-year-old male asked:
Dr. Ahmad M Hadied
48 years experience Orthopedic Surgery
See below please: U.S. Recommended dietary allowance (rda) for adults is as follows: 900 micrograms daily (3, 000 iu) for men and 700 micrograms daily (2, 300 iu) for w ... Read More
A 46-year-old member asked:
Dr. Karen Lawson
45 years experience Internal Medicine
No: This is a water soluble vitamin and the body will lose excess by urination. However moderation is an important rule of thumb and there is no reason to ... Read More
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A 52-year-old female asked:
Dr. Klaus d Lessnau
35 years experience Pulmonary Critical Care
1000 micro: Equals one milligram this dose works for most people. See doc if any trouble.
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