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Vitamin B12 injections 

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.


Most people have very busy lifestyles, and find it very difficult to find time for themselves. Due to this, many of us are unaware that we are deficient in essential vitamins and minerals. Deficient levels of vitamin B12 can quickly make people aware that their health is at risk. B12 plays an integral role in many functions of the body.

Vitamin B12 is water-soluble, your body does not store it and many of us are susceptible to not getting enough B12 in our diets. Luckily, people can receive their B12 through foods such as meat, fish, eggs and dairy products. If you do not already receive the B12 injection

vitamin B12 shots

What is a B12 injection?

A B12 injection sometimes referred to as a "shot" delivers a high dose of therapeutic B12, this is usually in the form of cyanocobalamin or hydroxocobalamin. In situations where a higher dose is needed or where injections are the only option, the B12 shot is used.

Sometimes B12 shots are also used as an energy booster since B12 plays a critical role in cellular energy production.


Vitamin B12 is needed to form red blood cells and DNA. It is also a key player in the function and development of brain and nerve cells.

Vitamin B12 binds to the protein in the foods we eat.

In the stomach, hydrochloric acid and enzymes unbind vitamin B12 into its free form.

Reasons why someone may have a B12 injection

Vitamin B12 injections are used to treat lower levels of this vitamin in the body, this is often referred to as a deficiency. B12 helps your body use fat and carbohydrates for energy and make protein. It also has an important role within the blood, cells and nerves. Most people should get enough B12 through the oral intake of their diet, but a deficiency may occur due to certain health conditions such as gastrointestinal disorders, cancers, hereditary issues or general poor nutrition. B12 injections are administered most often to people that have genetic conditions that block absorption and people with the disorder Pernicious Anaemia. Pernicious anaemia is caused by a decrease in red blood cells when the body cannot absorb enough vitamin B12, greatly increasing the risk of neurological complications. 

A diagram how vitamin B12 treats levels of B12 in the body
Diagram Stomach Acid B12 Deficiency

About B12 Deficiency

Vitamin B12 deficiency is believed to be one of the most common nutrient deficiencies in the world. Vitamin B12 deficiency can be more common in people that take anti-biotics frequently, those that are on stomach acid altering medications, elderly people and sometimes those that follow a vegetarian or vegan diet. When someone is B12 deficient they can sometimes need B12 injections to offset the many symptoms of vitamin B12 deficiency, such as fatigue and weakness, poor moods, and low concentration. 

Vitamin B12 deficiency can also have more serious effects in some people. B12 deficiency can disturb red blood cell formation and elevate homocysteine levels, which negatively impacts neurological and cardiovascular health, in addition to posing risks during pregnancy.

Signs and symptoms of a B12 deficiency

Some of the common symptoms of vitamin B12 deficiency include low mood disorders and depression, fatigue and generalised tiredness, memory failure, alongside low blood pressure and anaemia. The B12 injection may be used to boost energy, as a therapy for low mood and depression, or to drive cognitive function. Research is currently taking place to address B12 injections for other problems, such as bipolar disorder, shaky leg syndrome and autism.

A lady very tired with a vitamin b12 deficiency
vitamin B12 ampoules and needle

What does B12 actually do?

Vitamin B12 is a crucial for many vital metabolic and hormonal functions. This includes the production of digestive enzymes and carrying important nutrients in and out of cells. Some of the roles of vitamin b12 are:

  • Forming red blood cells

  • Playing a role in DNA/RNA synthesis 

  • Acting as a cofactor for methionine synthase (helping with methylation or the conversion homocysteine to methionine, which protects cardiovascular health and more)

  • Facilitating metabolic conversion of protein and fats

  • Carrying out neurotransmitter functions and helping with the production of hormones

  • Helping convert amino acids and make creatine 

  • Producing myelin sheath (the coating of the nerves)

  • Helping the synthesis of haemoglobin

  • Playing a role in foetal development during pregnancy 

Benefits of vitamin B12

Vitamin B12 injections offer numerous benefits for overall health and well-being:

  1. Increased Energy Levels: Vitamin B12 plays a crucial role in the production of red blood cells, which carry oxygen throughout the body. Adequate levels of B12 can help combat fatigue and boost energy levels.

  2. Improved Cognitive Function: B12 is essential for maintaining healthy neurological function. Adequate levels of B12 have been linked to improved memory, concentration, and overall cognitive performance.

  3. Enhanced Mood: B12 is involved in the synthesis of neurotransmitters such as serotonin and dopamine, which regulate mood. Supplementing with B12 may help improve mood and alleviate symptoms of depression and anxiety.

  4. Supports Heart Health: Vitamin B12 helps regulate homocysteine levels, an amino acid linked to an increased risk of heart disease when elevated. By keeping homocysteine levels in check, B12 may promote heart health.

  5. Boosts Metabolism: B12 is involved in the metabolism of fats and carbohydrates, playing a role in converting food into energy. Adequate B12 levels can support a healthy metabolism and aid in weight management.

  6. Supports Nervous System Function: B12 is essential for the maintenance of myelin, a protective sheath that surrounds nerves. Adequate B12 levels help support optimal nervous system function and may reduce the risk of neurological disorders.

  7. Enhances Skin, Hair, and Nail Health: B12 contributes to the production of DNA, which is necessary for the growth and repair of skin cells. Adequate B12 levels can promote healthy skin, hair, and nails.

Overall, vitamin B12 injections can provide a quick and effective way to ensure optimal B12 levels, leading to improved energy, mood, cognitive function, and overall health.

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