vitamin b12 side effects mayo clinic

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Dr. Milton Mintz answered:

what are the side effects of vitamin b12?

None that

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I know of
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Dr. Alan H. Ali answered:

Do vitamin b12 supplements have any side effects?

B12 Vitamin

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Generally, there is no risk of toxicity from too much B12, however, if taken at same time with Antibiotics for Acne, such as Tetracycline, it can lower effectiveness of the Antibiotic. Some reported adverse events include Allergy, Fever, Headaches, Joint pains, Upset stomach, Swelling, Dizziness.
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Dr. Andrew Blazar answered:

I'm taking a vitamin b12 supplement of 1,000 mcg's per day, any side effects to worry about?

No

Vitamin_b12
But it may not be helpful and may be wasteful
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Dr. Jack Mutnick answered:

Should i consume tinospora cardifolia concentrate, as in 2010 i was diagnosed with itp and vitamin b12 deficiency? Does the herb has side effects?

ITP

Vitamins_and_supplements
You really should discuss this with your hematologist who treated your ITP and/or whomever follows you for this condition. I cannot personally recommend you to take an "herbal concentrate" since it is not monitored by the FDA and side effects have been reported.
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Dr. Jack Rubin answered:

My doc says im aneamic and has prescribed me dexorange syrup it has iron folic acid and vitamin b12 but im afraid will it giv me any side effects?

Anemia treatmemt

Anemia
Other than possible constipation, caused by iron, the syrup (S) your physician (P) prescribed will give harmless. Ask your P what you folate, iron and B12 values are. If they are normal, you will gain nothing by the S. Anemia can come from blood loss, either by GI or menstrual losses. If you iron (I) level is low, and you eat meat, consider one of those as the cause of your anemia.
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Dr. Joy M. Jackson answered:

When is the best time to take vitamins, such as vitamin B12 and Biotin?

As

As a general rule of thumb, it is better to take vitamins with a meal. This allows for better absorption. However this is not an absolute. In addition, remember to check with your doctor before taking any vitamins, minerals, or supplements in order to ensure that it won't interfere with any possible medications you are taking.
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Dr. Olivia C. Liao answered:

Are all B vitamins essential for our body/health?? Namely Vitamin B12 and B6?? Thank you.

B12 and B6

Neuropathy
are essential for good health. deficiencies can cause nerve damage.
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Is taking prenatal vitamins with vitamin b12 when not pregnant generally considered safe?

Sure

Vitamin_b12
Go for it!
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Dr. Ed Friedlander answered:

Is it true that huge doses of vitamin B12 inhibit the levels of other B vitamins? (source:the web)

No

Medication
Someone writing on the internet can put out any silly fantasy and make money doing it, as they appear very learned and caring. This one's just not true. Unlike these people, the scientific physicians in our community and on HealthTap are bound by law to tell the truth.
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I am 10 weeks pregnant can i take 500 mcg of vitamin b12 i am also taking prenatal vitamins as well.

You can

Medication
However if your blood count is normal there is no need for B12
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