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What are the benefits of taking vitamin B12?

Author

Emma Payne

Published Jan 14, 2026

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.

How much B12 should you take a day?

The recommended daily amount of vitamin B-12 for adults is 2.4 micrograms.

Does B12 make your hair grow?

Sufficient amounts of RBCs enhance your body's natural functions, including hair growth. B12 could actually make your hair follicles healthier and stronger. This can result in better hair growth and stronger hair strands.

What are the benefits and side effects of vitamin B12?

Vitamin B12 benefits include forming red blood cells, preventing dementia, and reducing birth defects. Vitamin B12 is found in foods like meat, eggs, dairy, and fish. Side effects of B12 are rare but can include headaches, anxiety, and nausea.

What happens when your vitamin B12 is low?

Constipation, diarrhea, loss of appetite, or gas. Nerve problems like numbness or tingling, muscle weakness, and problems walking. Vision loss. Mental problems like depression, memory loss, or behavioral changes.

20 related questions found

What are the warning signs of vitamin B12 deficiency?

Symptoms of vitamin B12 deficiency

  • a pale yellow tinge to your skin.
  • a sore and red tongue (glossitis)
  • mouth ulcers.
  • pins and needles (paraesthesia)
  • changes in the way that you walk and move around.
  • disturbed vision.
  • irritability.
  • depression.

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 ...

Does B12 raise blood pressure?

We found that a higher intake of vitamin B12 was associated with lower systolic and diastolic blood pressure and a higher intake of folic acid was associated with lower systolic blood pressure in children.

What happens when your B12 levels are too high?

However, supplementing with excessively high levels of B12 has been linked to some negative side effects. Several studies have shown that megadoses of the vitamin can lead to outbreaks of acne and rosacea, a skin condition that causes redness and pus-filled bumps on the face.

Does vitamin B12 prevent GREY hair?

In addition to food, both vitamins B6 and B12 can be found in a range of supplements which may help you to prevent grey hairs and restore your natural colour.

Can B12 improve skin?

What it does: B12 is necessary for cell reproduction and can be applied topically for skin benefits because it reduces inflammation, dryness, and acne. It is sometimes used to treat conditions like psoriasis and eczema.

Does B12 deficiency cause joint pain?

It's necessary for maintaining both mental and physical health. Not getting enough vitamin B12 to the point of a deficiency can cause a variety of serious symptoms including depression, joint pain, and fatigue. Sometimes these effects can be debilitating to the point where you might think you're dying or seriously ill.

When should I take B12 morning or night?

As a general rule of thumb, take your B vitamins in the morning or with a meal. Vitamin B12, for example, should definitely be taken in the morning. This is because it is important for energy metabolism, which may interrupt your sleep if taken at night.

How long does it take for B12 to kick in?

It may take a few weeks before your vitamin B12 levels and symptoms (such as extreme tiredness or lack of energy) start to improve. If you have hydroxocobalamin injections to boost your vitamin B12 levels at the start of treatment, the cyanocobalamin tablets may start to work within a few days.

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

What is the dosage for cyanocobalamin tablets? 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.

Which form of vitamin B12 is best?

The vitamin itself is available in several forms, most commonly methylcobalamin and cyanocobalamin. However, the best option is clear. “Go for the methylcobalamin form of vitamin B12 because it is absorbed much better by the body than other forms of vitamin B12,” says Dr. Boyer.

Which vitamin B12 is best?

The body may absorb cyanocobalamin better, while methylcobalamin has a higher retention rate. Both can prevent B12 deficiency, but methylcobalamin should be combined with adenosylcobalamin for best results.

Can lack of vitamin B12 cause back pain?

It is necessary for blood cell formation and repair, production of DNA and overall maintenance of brain cells. Vitamin B12 helps the body replace nerve cells in the spine and additionally also reduce inflammation, a common cause of chronic back pain.

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.

Can B12 cause heart palpitations?

There are a variety of symptoms that come with a B12 deficiency. One sign associated with the condition is experiencing heart palpitations. “Your heart may feel like it's pounding, fluttering or beating irregularly, often for just a few seconds or minutes.

Can low B12 cause hair loss?

Symptoms of low B12 often occur when blood level drops below 300 ng/l and include hair loss, breathlessness, lack of energy palpitations, bleeding gums, mouth ulcers, tingling in the hands and feet.

Can you take vitamin B12 with blood pressure pills?

No interactions were found between lisinopril and Vitamin B12.

Does B12 cause dementia?

Vitamin B12 has not been proven to cause Alzheimer's or dementia, but studies have shown that increasing B12 intake in women can slow cognitive decline.

Can you take other vitamins with B12?

Vitamin B-12 helps maintain your nervous system and form red blood cells. Studies show that taking these two supplements at the same time may reduce the amount of vitamin B-12 that you receive. So, experts recommend taking these supplements at least two hours apart.