Is 500 mcg of vitamin B12 OK?

In one 8-week study in 100 older adults, supplementing with 500 mcg of vitamin B12 were found to normalize B12 levels in 90% of participants. Higher doses of up to 1,000 mcg (1 mg) may be necessary for some ( 10 ).

Is B12 level of 1500 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 level is borderline B12 deficiency?

Patients with B12 levels between 200 and 300 pg/mL are considered borderline, and further enzymatic testing may be helpful in diagnosis. Patients with B12 levels below 200 pg/mL are considered deficient.

What are the neurological symptoms of B12 deficiency?

Is vitamin B12 deficiency serious?

Vitamin B12 deficiency can lead to serious complications such as nerve damage, anemia and fatigue, which is why those at risk should add a high-quality B12 supplement to their diet ( 2 ).

Is 5000 mcg B12 too high?

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.

Is vitamin B12 worth taking?

Vitamin B12 is a nutrient that helps keep your body's blood and nerve cells healthy and helps make DNA, the genetic material in all of your cells. Vitamin B12 also helps prevent megaloblastic anemia, a blood condition that makes people tired and weak.

Is B12 level of 1200 too high?

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).

How can I get 2.4 mcg of B12?

Top foods with B12

The average adult should get 2.4 micrograms (mcg) of vitamin B12 a day, according to the National Institutes of Health. Here are some of the best foods with B12: Clams, 3 ounces: 84 mcg. 100% fortified breakfast cereal (check the label), 1 serving: 6.

Can vitamin B12 damage 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.

What is the most common cause of vitamin B12 deficiency?

However, the most common cause of vitamin B-12 deficiency anemia is a lack of a substance called intrinsic factor, which can be caused when your immune system mistakenly attacks the stomach cells that produce this substance. This type of anemia is called pernicious anemia.

How can I raise my B12 levels fast?

What are the long term effects of B12 deficiency?

Untreated B12 deficiency will eventually lead to anemia and neurologic complications such as unsteady gait and paralysis. Low levels of the vitamin have been found to be associated with depression and dementia, increased confusion, lethargy and even osteoporosis.

Is 400 a low B12 level?

Patients with serum vitamin B12 levels between 150 and 400 ng/L are considered borderline deficient and should be evaluated further by functional tests for vitamin B12 deficiency.

Is 600 a good B12 level?

In order to avoid the development of neuropsychiatric symptoms, some experts recommend that B12 levels should be at least 600 pg/mL, and over 1,000 pg/mL to maximize mental functioning.

Is 350 a low B12 level?

A serum vitamin B₁₂ level between 200 pg/mL and 900 pg/mL is considered normal, but a threshold of 300 to 350 pg/mL is recognized as a marker for a desirable status in the elderly. The laboratory diagnosis is usually based on low serum vitamin B₁₂ levels or elevated serum methylmalonic acid and homocysteine levels.

What level of B12 is dangerously 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.

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.

Is 250 mcg of B12 enough?

While there's no upper limit to how much vitamin B12 you can take, there are general dosage recommendations. For example, the Vegetarian Nutrition Dietetic Practice Group recommends that vegans consider supplementing with 250 mcg of B12 per day.

What is vitamin B12 1000 mcg used for?

Cyanocobalamin is a man-made form of vitamin B12 used to treat low levels (deficiency) of this vitamin. Vitamin B12 helps your body use fat and carbohydrates for energy and make new protein. It is also important for normal blood, cells, and nerves.