While megadoses of up to 2,000 mcg are considered safe in treating B12 deficiency, it’s always best to avoid excessive amounts of any vitamin, especially when it’s not needed.

What is the maximum amount of B12 you can take daily?

Safety and side effects. When taken at appropriate doses, vitamin B-12 supplements are generally considered safe. While the recommended daily amount of vitamin B-12 for adults is 2.4 micrograms, higher doses have been found to be safe. Your body absorbs only as much as it needs, and any excess passes through your urine …

What is vitamin B12 5000 mcg used for?

B12 5000 mcg Extra Strength B12; Sisu B12 sublingual tablets deliver high-potency B12 in its most active form, methylcobalamin to help the body metabolize carbohydrates, fats, and proteins as well as to help form red blood cells.

How much B12 is considered high?

High. An abnormally high vitamin B-12 status is anything over 900 pg/mL. This result may suggest liver or kidney problems, diabetes, or certain forms of leukemia.

Is 10000 mcg of B12 a lot?

Supplementation of 25-100 mcg per day has been used to maintain vitamin B12 levels in older people. For vitamin B12 deficiency: Vitamin B12 doses of 300-10,000 mcg daily have been used. However, some evidence suggests that the most effective oral dose is between 647-1032 mcg daily.

Is it OK to take 1000 mcg of B12 a day?

The recommended dose for treating vitamin B12 deficiency is 1000 mcg daily. The recommended dose for preventing vitamin B12 deficiency is 1500 mg or 2500 mcg (sublingual tablets) daily. The dose for treating hyperhomocysteinemia is 400 mg daily in combination with folic acid.

Can you overdose on B12?

No, you cannot overdose on B12 Medical term: A tolerable upper intake level is the highest level of nutrient intake that does not pose any adverse health effects for the majority of people. Vitamin B12 is a water-soluble vitamin, meaning it dissolves in water and is quickly absorbed by the body.

Is B12 level of 1000 too high?

There is no consensus on the definition of high or elevated B12. Previous studies have chosen a variety of levels to represent high or very high B12 (pmol/l) levels. Some examples include: 664.219; 5131; 700 (high) and 1500 (very high)11; and 601 (high) and 1000 (very high)10.

What does a vitamin B12 level of 2000 mean?

But a normal level of vitamin B12 in your bloodstream is generally between 190 and 950 picograms per milliliter (pg/mL). Between 200 to 300 pg/mL is considered borderline and your doctor may do more testing. Below 200 pg/mL is low and more testing is needed.

Can B12 hurt your liver?

The common forms of vitamin B include vitamin B1 (thiamine), B2 (riboflavin), B3 (niacin), B6 (pyridoxine) and B12 (cyanocobalamin). Except for niacin (when given in high doses), there is no evidence that the other B vitamins, in physiologic or even super-physiologic high doses cause liver injury or jaundice.

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How much B12 does a woman need?

Life StageRecommended AmountTeens 14–18 years2.4 mcgAdults2.4 mcgPregnant teens and women2.6 mcgBreastfeeding teens and women2.8 mcg

How much B12 should an elderly woman take?

Recommended Vitamin B12 Dosage for Seniors A recent study found that for seniors, a daily dose of 500 micrograms was efficient in reversing the signs of B12 deficiency. In general, experts recommend 2.5 micrograms of vitamin B12 per day for people over the age of 14.

What medications should not be taken with B12?

Certain medications can decrease the absorption of vitamin B12, including: colchicine, metformin, extended-release potassium products, antibiotics (such as gentamicin, neomycin, tobramycin), anti-seizure medications (such as phenobarbital, phenytoin, primidone), medications to treat heartburn (such as H2 blockers …

Can you overdose on vitamin B?

You’re also unlikely to get too much vitamin B if you’re taking any supplementation as directed. That said, overdose is possible — especially if you’re taking a supplement without receiving a deficiency diagnosis from your doctor. Symptoms of a vitamin B complex overdose include: excessive thirst.

Why is B12 sold in such high doses?

Doctors tend to prescribe these higher dosages to treat conditions related to very low vitamin B-12 levels, such as pernicious anemia. Although vitamin B-12 appears, for the most part, to be safe — even at higher dosages — more is not necessarily better.

Can B12 cause anxiety?

B12 Causes Psychiatric Symptoms: B12 deficiency can cause almost any psychiatric symptom, from anxiety, and panic to depression and hallucinations. This is because B12 deficiencies trigger symptoms in the nervous system and red blood cells.

What is the difference between 2.4 mcg and 1000 mcg?

1000 mcg is about 400 times as much as 2.4 mcg.

Is 1300 too high for B12?

The normal range for vitamin B12 (total) is between 200 – 1100 ng/L (nanograms per liter), 200 – 1100 pg/mL (picograms per milliliter), or 148 – 811 pmol/L (picomoles per liter). The normal range for active vitamin B12 (holoTC) is around 20 – 134 pmol/L (picomoles per liter).

What is a dangerously low B12 level?

Values of less than 160 pg/mL (118 pmol/L) are a possible sign of a vitamin B12 deficiency. People with this deficiency are likely to have or develop symptoms. Older adults with a vitamin B12 level less than 100 pg/mL (74 pmol/L) may also have symptoms.

Is High B12 level a problem?

Elevated levels of serum cobalamin may be a sign of a serious, even life-threatening, disease. Hematologic disorders like chronic myelogeneous leukemia, promyelocytic leukemia, polycythemia vera and also the hypereosinophilic syndrome can result in elevated levels of cobalamin.

Is B12 hard on kidneys?

A: Vitamin B-12 is a water-soluble vitamin. Excess amounts of it (no matter how much you take) typically are just cleared by the kidney, so high levels of B-12 can occur if the kidneys aren’t working properly. B-12 is stored by the liver, so any liver damage that causes cells to die can increase blood B-12 levels.

Can B12 cause blood clots?

Population research suggests that having low levels of vitamin B12 might be linked to an increased risk for blood clots in the veins.

Does B12 make you poop?

Constipation. Vitamin B complex helps in stimulating muscle contraction in the digestive system, which is necessary for the easy movement of stool through the bowel. It also stimulates the production of digestive juice to speed up your digestion.

How soon does vitamin B12 start working?

B12 injections work quickly; they are the most effective way for your body to absorb Vitamin B12. Within 48 to 72 hours, your body will begin to make new red blood cells. For mild deficiencies, you may need two to three injections over several weeks to notice peak impact.

How much B12 is in an injection?

If you have a vitamin B12 deficiency, the initial dose is usually 30mcg injected under the skin or into the muscle every day for between 5 and 10 days to boost levels of B12 quickly. For maintenance, it is common to have monthly therapy of 100-200 mcg.

How long does it take to get rid of excess B12?

Unlike most other vitamins, B12 is stored in substantial amounts, mainly in the liver, until it is needed by the body. If a person stops consuming the vitamin, the body’s stores of this vitamin usually take about 3 to 5 years to exhaust.

Why does B12 make me tired?

Fatigue. If you’re low or deficient in B12, you’ll likely feel fatigued. Your body’s cells need B12 to function properly. As such, having inadequate B12 levels can decrease normal red blood cell production, which can impair oxygen delivery ( 8 ).