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Doctor insights on: Vitamin B12 Dosage For Adults

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What is the max daily dose of vitamin B12 an adult female with very low levels can take? If her face is flushed is she taking too much?

What is the max daily dose of vitamin B12 an adult female with very low levels can take? If her face is flushed is she taking too much?

Interesting question: Adults generally need 2.6 micrograms b12/day. To replace deficiencies, im shots bypass gut absorption problems that can contribute to deficiency in the first place. 1, 000 micrograms of intramuscular cobalamin can be given once/day for 10 days, then once/week for four weeks, followed by once/month for life. Sublingual b12, 500-1000mcg/day. The form of B12 (cobalamin) may be important; see comment. ...Read more

Dr. Randy Baker
1,010 Doctors shared insights

Vitamin B12 (Definition)

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


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I'm a lifelong vegan, was told that I should be taking vitamin B12 supplements; I can't get this from anything plant based. But what dosage, please?

1000 mcg methylcob.: A common dosage is 1000 mcg. I advise the methylcobalamin form if you can find it. B12 is usually absorbed better when taken in a sublingual form. See http://bit. Ly/1607tg3
; http://www. Naturalnews. Com/027045_vitamin_b12_cyanocobalamin_methylcobalamin. Html
; http://www. Mend. Net/cgh/methylcobalamin. Html. ...Read more

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Nutritionist told me to take vitamin B12 to help me sleep. Will it work? And is 2500mcg sublingual form too large a dosage? Thankyou

Nutritionist told me to take vitamin B12 to help me sleep. Will it work? And is 2500mcg sublingual form too large a dosage? Thankyou

It depends, no: When someone has insomnia B12 is not the first treatment that comes to mind, but B12 is needed for our bodies to make melatonin which helps regulate sleep, so if you are deficient in B12 then taking it can improve sleep. 2500 mcg is totally safe; only a small fraction of B12 is absorbed no amount of B12 is known to be toxic. See http://bit. Ly/1hlbiaz for more on B12 deficiency. ...Read more

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It has been suggested that I take vitamin B12 because the bottoms of my feet feel numb but they aren't. I do not have diabetes. What dosage?

It has been suggested that I take vitamin B12 because the bottoms of my feet feel numb but they aren't. I do not have diabetes. What dosage?

B12: You should not take vitamin B12 withut getting evaluated for numbness of your feet. You should have b12, methymelonic acid levels and if you are found to be deficient in vit B12 then you need to be treated either with injectable vitb12 or nasal spray in therapeutic dases followed by maintainance doses, the numbness may due to other causes. ...Read more

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I am looking to take liquid vitamin B12 for lack of energy. What would the recommended dosage be if I am not quite certain I am actually deficient?

I am looking to take liquid vitamin B12 for lack of energy. What would the recommended dosage be if I am not quite certain I am actually deficient?

Need more info: Unless you are deficient in B12, taking B12 will not make a difference. Body needs about 3-5 micrograms of B12/day. Taking more will not do harm.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex.
Get HPV vaccine, if you are under 27 years of age. ...Read more

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I took vitamin b12 1000mcg on may 28th how long does it take for b12 too get out of the body fully so I can take a Lower dose 250mcg.

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 250 will be about the same as 1000. You can take the 250mcg any time. Since this is in many foods and is even produced by intestinal bacteria, a clinical deficiency occurs only in special circumstances. Vegan diet. Long term use of PPI or H2 blocker s ...Read more

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Dose metformin cause a vitamin B12 deficiency? I am taking this.

Dose metformin cause a vitamin B12 deficiency? I am taking this.

Yes: Many medications can promote B12 deficiency. Metformin is one of them. Stomach acid-blockers are another.
Aim for serum B12 levels of at least 800. ...Read more

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Have vitamin B12 deficiency, and was told to start taking daily high dose oral supplements (injections not practical). So many options! What's best?

Have vitamin B12 deficiency, and was told to start taking daily high dose oral supplements (injections not practical). So many options! What's best?

Try sublingual tabs: Try the sublingual tablets, then get your levels tested in 3-6 months. Place the tablet beneath your tongue/allow it to dissolve. Can be taken with /without food. Heavy alcohol intake can decrease the effectiveness of this medication. Talk with you doctor if you are drink alcohol on a regular basis. B12 also available in tablet / nasal forms. B12 found in meat, fish, liver cheeses/milk. Take car. ...Read more

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Can I take vitamin B12 supplements with double-dose PPIs for reflux? Worried about the Vit B12 deficiency that might be caused with long-term PPI use.

Can I take vitamin B12 supplements with double-dose PPIs for reflux? Worried about the Vit B12 deficiency that might be caused with long-term PPI use.

Sure: You need gastric acid for pepsin to play its role in protecting and then uncoating vitamin B12. Keep having your levels followed. Oral supplements may work despite this mechanism simply by having so much of the stuff around. And talk with your physician from time to time about whether long-term PPI use is still indicated. Glad you're reading up and best wishes. ...Read more

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I want to add vitamin B12 to my daily regimen but I take Prilosec everyday for gerd. What kind of dose should I take for energy/heart health?

I want to add vitamin B12 to my daily regimen but I take Prilosec everyday for gerd. What kind of dose should I take for energy/heart health?

Vitamin B12: You can take oral vitamin B12 of 1, 000mcg daily. It's not necessarily helpful for energy or heart health, especially if you are not B12 deficient. Prilosec when used for a very long time can cause B12 deficiency. Prilosec should be taken about 30 minutes before meal, and should not be taken together with vitamin B12 as it can decrease the absorption of b12. ...Read more

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My age is 23.i m suffering frm thyroid TSH 7.38 Also vitamin D is 9.8, severe joints pain in whole body. Vitamin B12 is also less. Doctor has prescribe Anachitol 6 dose per week and Megaremon 8 dose per 3 days. Also one tablet Newbona active. Please te

GI problem?: Based on the low levels of several vitamins, I would be concerned about some form of malabsorption syndrome. Do you have chronic diarrhea? Pernicious anemia from low B12? Osteomalacia from low Vit D? You probably need to take some levothyroxine (but will you absorb this?). Sounds like your doctor is giving you vitamins, which is good, but what is the cause of all this? ...Read more

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Symptoms of vitamin B12 low?

Many: Main ones are: fatigue, neurological symptoms (like numbness ; tingling), GI symptoms (like nausea, GI upset) and weight loss. ...Read more

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What food contains vitamin b12?

What food contains vitamin b12?

B12: B12 principally derives from animal sources and eggs. Dairy has little. Select soy can provide some. More vegan foods are being supplemented with B12, as B12 defici, ency is common among vegans. See www. Vegetarian. Org. Uk/factsheets/b12factsheet. Html ...Read more

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Can you overdose on vitamin b12?

Virtually nontoxic: At any dose. I do not believe that you will find very much written on the toxic effects of B12 although I have had a couple of patients who took something on the order of 10x what I had prescribed them was already in the 10, 000IU range so they were taking about 100, 000IU daily for several weeks and the patient developed diarrhea. When he stopped that resident, within several days diarrhea stopped ...Read more

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Why would ihave low vitamin b12?

Why would ihave low vitamin b12?

Possible causes: You could have a low b-12 if you are vegetarian, have been for several years and don't take supplemental b-12. It could be low if you don't make intrinsic factor. This is made in the stomach and is needed to absorb b-12. Lack of intrinsic factor is usually an autoimmune disorder. You could have low b-12 due to taking proton pump inhibitors for a long time as stomach acid is needed as well. ...Read more

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What does high vitamin B12 mean?

Depends: It can mean that you have been taking B12 supplements!
for other reasons, see http://drfairchild. Blogspot. Com/2012/12/b12-deficiency. Html. ...Read more

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My vitamin b12 is 241 is this bad?

My vitamin b12 is 241 is this bad?

Borderline: I assume the units are pg/mL. Consider following this up with a functional assay such as methylmalonic acid and/or taking a routine supplement. Your physician is your best guide. ...Read more

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Is 1000 iu of vitamin B12 too much?

Is 1000 iu of vitamin B12 too much?

Not usually: That is a safe dose generally. What matters more is the kind of b12 you take. There are 4 different kinds of B12 available on the market. Cyanocobalamin is the synthetic kind, and not as good. More info:
Http://drfairchild. Blogspot. Com/2012/12/b12-deficiency. Html ...Read more

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Is vitamin B12 2500 mgs bad for you?

Is vitamin B12 2500 mgs bad for you?

B-12: No, that dosage is perfectly fine. There has not been an upper limit set for oral vitamin b-12. Generally speaking if and individual has a vitamin b-12 deficiency confirmed by test, it is either given im or sc. ...Read more

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What mineral is part of vitamin b12?

What mineral is part of vitamin b12?

Cobalt: There is a tiny cobalt ion in the middle of this huge molecule. ...Read more

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What are the benefits of vitamin b12?

What are the benefits of vitamin b12?

Several: Primarily, B12 supports the production of red blood cells and supports the nervous system (brain, spinal cord, and all the nerves all over your body). ...Read more

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What is the best use for vitamin b12?

Absolutely: B12 in the form of methyl cobalamin is necessary for numerous biochemical pathways. It can prevent psychoses, nerve tissue degeneration and megaloblastic anemia. Methyl B12 can be given safely at doses up to 3mg intramuscularly and can be given weekly in those patients who cannot absorb it through the GI tract. Otherwise, 2mg oraly is optimal. There are no known side-effects of having to much. ...Read more

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What's the best way to get vitamin b12?

Meat, supplements: The best dietary source of B12 is, surprisingly, clams. Beef liver is another good source, though I would only eat this if organic. Salmon & other fish, beef, dairy & eggs are also good sources. Many grains & cereals are fortified with b12. The most reliable vegan source is nutritional yeast but I advise vegans to take a B12 supp. See http://ods. Od.Nih. Gov/factsheets/vitaminb12-healthprofessional/. ...Read more

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Which foods have a lot of vitamin b12?

Which foods have a lot of vitamin b12?

Foods with B12: Foods that are rich in B12 include beef liver, enriched cereals, fortified soy products, and shellfish (clams, crab). ...Read more

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What amount vitamin B12 should I take?

Depends: At your age if your intestinal track works okay you eat fish, chicken or meat at least three times a week, and you don't take any medicines like a proton pump inhibitor like Prilosec for heartburn then you probably don't need any extra B12. Your doctor can confirm if you need. ...Read more

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Is vitamin B12 2500mcg a day too much?

The maximum dose for: People who has confirmed case of vitamin B12 deficiency is 200microgram a day. You are taking higher than the recommended dose and I am not sure if you have vitamin B12 deficiency. ...Read more

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What kind of food contains vitamin b12?

What kind of food contains vitamin b12?

Protein: Best source is animal and vegans often become B12 deficient. Fish and poulty youyr best bet. ...Read more

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Could someone eat too much vitamin B12?

Not usually: When I read "eat too much vitamin b12", I assume you're referring to foods containing b12? Generally speaking, when people talk about B12, they are referring to supplemental vitamin b12. It is generally accepted that high doses of B12 does not pose any dangers, partly because it's a water soluble vitamin. ...Read more

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What are the best sources of vitamin b12?

What are the best sources of vitamin b12?

Animal yes plants no: Vitamin b12, or cobalamin, is in fish, meat, poultry, eggs and milk products. Generally speaking, you won't find vitamin B12 in plant foods. Some nutritional yeast products contain vitamin b12. Follow this link, http://www. Healthaliciousness. Com/articles/foods-high-in-vitamin-b12.Php for more specific info. ...Read more