What Do Vitamin B-12 Injections Do For You?

B-12 Injections

B-12 Injections are injections that a doctor may prescribe to treat a lack of vitamin B12, especially if the body has trouble absorbing it.

A lack of vitamin B12 can cause many health problems, from tiredness to permanent changes in the brain’s workings.

If a person has low vitamin B12 levels because of a health problem, a doctor may suggest taking the vitamin in pill form or giving B-12 injections.

Most of the time, B-12 injections are for people who have trouble absorbing vitamin B12 or have had gastric surgery. This is because shots allow the body to absorb vitamin B12 without going through the digestive system. 

This article talks about how important it is to get enough vitamin B12 and the benefits and risks of getting B-12 Injections.

What Is Vitamin B12, And What Does It Do?

Vitamin B12, also known as cobalamin, is a vitamin that dissolves in water. It can exist in a few different chemical forms, but all these forms of Vitamin B12 have the mineral cobalt in them.

Since the liver can store the vitamin for a long time, it may take a few years for a deficiency to show up. Vitamin B12 is a water-soluble vitamin that helps the brain work well and makes red blood cells.

Vitamin B12 Deficiency

B-12 injections are usually prescribed for a daily intake (RDI) of 6 micrograms. People who eat a vegetarian or vegan diet are more likely to be deficient. In fact, it is thought that up to 90% of the people who follow these diets are missing something.

This is because B12 is only naturally found in foods that come from animals.

But vegans and vegetarians aren’t the only people who aren’t getting enough. Even some people who eat meat have trouble absorbing it.

Intrinsic factor binds to vitamin B12, so the body can take it in and use it. People can become deficient if they don’t make enough of their intrinsic factors.

A person over 60 is more likely to be deficient because they may not be able to absorb vitamin B12 as well as they used to. 

People who have had intestinal surgery, such as surgery to help them lose weight, are also at risk of being deficient. People with Crohn’s disease or celiac disease, which affect the gut, are also at risk.

Vegans and vegetarians are most likely not to get enough vitamin B12 because they don’t eat meat or dairy. Poor absorption can also lead to a lack of something.

Effectiveness of B-12 Injections

Vitamin B12 deficiency that isn’t treated can cause nerve problems or pernicious anemia. Pernicious anemia happens when your body doesn’t have enough B12 to make enough red blood cells (16Trusted Source).

The most common way to prevent or treat a lack of vitamin B12 is to get B-12 injections. The doctor tells you to give the B-12 Injections intramuscularly, which means into the muscle.

Most of the time, hydroxocobalamin or cyanocobalamin is given as an injection. These are very good at increasing the amount of B12 in the blood and preventing or fixing a deficiency.

If you don’t have enough vitamin B12 in your blood, the B-12 injections work very well to bring it up.

Beneficial For Your Health

Because vitamin B12 is so important to your body, not getting enough of it can harm your health.

Ensuring you get enough vitamin B12 is important for your brain, mind, bones, and eye health. If you don’t have a deficiency, doing a B-12 injection course is probably not necessary.

The Brain’s Job

Brain function seems to worsen when you don’t get enough vitamin B12. Two recent studies found that low blood levels may be linked to the onset of dementia. But the results have been mixed, and people with normal brain function didn’t get better brain function when they took vitamin B12.


Low levels of vitamin B12 have a link to depression.

But one study found that giving vitamin B12 to people with depression didn’t make their symptoms less bad.

At the moment, there isn’t enough good research in this area. To find out if there is a link between vitamin B12 and depression, we need to do better studies.


Osteoporosis is a disease in which bones become weaker and more likely to break because they have lost bone mass. 

Low levels of vitamin B12 in the blood have been linked to less bone mass, which is interesting. So, it has been said that taking vitamin B12 might make you less likely to get osteoporosis. But studies have come up with mixed results.

Age-Related Macular Degeneration

Age-related macular degeneration is a condition that causes you to slowly lose your central vision, usually in both eyes. In one large study, 5,200 women got 1,000 mcg of vitamin B12 daily, along with other B vitamins and folic acid. 

Even though vitamin B12 can’t be the only reason for the lower risk, it does show that getting enough of it may be important.

Other Arguments

Vitamin B12 injections and infusions have become popular in recent years among healthy people who don’t seem to need them. 

People who support this method say that regular injections can give you more energy, help you lose weight, and make you feel better. But there isn’t much or any proof to back up these claims.

How Safe It Is And What It Does

Most people think that vitamin B12 injections are very safe. There are no big problems with them.

But in very rare cases, allergic reactions or sensitivity can cause some people to have side effects. Talk to your doctor if you notice any side effects.


Most people get enough vitamin B12 from what they eat, but some have a shortage. This can happen if your body doesn’t have enough intrinsic factors, if you have a digestive disorder, or if you eat mostly plants. 

Depending on what caused the deficiency, a doctor may suggest taking pills or getting B-12 injections to make up for what you don’t get from food.