8 Reasons Why Vitamin B12 Is Important

Vitamin B12 is an essential nutrient that supports many important functions in the body. It helps with red blood cell formation, DNA synthesis, nervous system health, and cellular energy production. Maintaining healthy vitamin B12 levels also supports cognitive function, mood, and overall wellness.

Many health professionals emphasize the importance of getting enough vitamin B12 through diet or supplementation because low levels may affect energy, nerve health, and red blood cell production.

In this article, we’ll cover:

• The role vitamin B12 plays in the body
• Eight reasons vitamin B12 is important
• What may happen when vitamin B12 levels are low
• How the body absorbs vitamin B12

What Role Does Vitamin B12 Play in the Body?

Vitamin B12 is an essential vitamin the body cannot produce on its own. It is needed for proper nerve function, red blood cell production, DNA synthesis, and many metabolic processes.

Vitamin B12 is also known as cobalamin because it contains the mineral cobalt. It belongs to the group of eight B vitamins collectively known as the vitamin B complex.

B vitamins support metabolism and help maintain healthy blood cells, nerve cells, skin, and other tissues throughout the body.

8 Reasons Vitamin B12 Is Important

1. Supports Red Blood Cell Formation and DNA Production

Vitamin B12 supports the production of healthy red blood cells by contributing to hemoglobin synthesis.

Red blood cells transport oxygen from the lungs to tissues throughout the body. Hemoglobin, the protein inside red blood cells, makes this oxygen transport possible.

Vitamin B12 also supports the formation of DNA by assisting chemical reactions involved in cell growth and replication.

Low vitamin B12 levels may interfere with healthy red blood cell production, which can contribute to megaloblastic anemia, a condition where red blood cells become unusually large and less efficient at carrying oxygen.

2. Supports DNA Synthesis

Vitamin B12 plays a role in reactions that help convert homocysteine into methionine, which supports the production of compounds needed for DNA synthesis.

Healthy DNA production is important because it supports normal cell growth, repair, and reproduction throughout the body.

3. Supports Healthy Cell Metabolism

Vitamin B12 acts as a cofactor in many chemical reactions involved in metabolism.

These reactions help the body convert nutrients into usable cellular energy and support the production of important biomolecules required for normal body functions.

4. Supports Brain and Nervous System Health

Vitamin B12 supports several important processes involved in brain and nerve function, including:

• Synaptogenesis, which supports communication between nerve cells
• Myelination, the formation of the protective sheath around nerves
• Neurotransmitter production, which supports signaling throughout the nervous system

These processes are important for cognitive health and normal nervous system function.

Low vitamin B12 levels have been associated with memory issues and cognitive changes, especially in older adults. Some studies suggest that maintaining healthy vitamin B12 levels may support cognitive wellness as part of a balanced lifestyle.

5. Helps Maintain Healthy Homocysteine Levels

Vitamin B12 helps convert homocysteine into methionine, helping maintain homocysteine levels already within the normal range.

Maintaining healthy homocysteine levels is important for cardiovascular wellness and healthy circulation.

6. Supports Energy Metabolism and Mood

Vitamin B12 helps the body convert carbohydrates into usable cellular energy through metabolic pathways involved in ATP production.

ATP is the main energy source used by cells for daily functions throughout the body.

Vitamin B12 supplementation may help individuals with low vitamin B12 levels support normal energy metabolism. However, taking additional vitamin B12 beyond normal levels may not increase energy in individuals who already have sufficient intake.

Vitamin B12 also supports nervous system health, which plays a role in maintaining overall mood and well-being.

7. Supports Healthy Red Blood Cell Function

Because vitamin B12 supports healthy red blood cell formation, maintaining adequate levels may help support healthy oxygen transport throughout the body.

Low vitamin B12 levels may contribute to fatigue and weakness associated with impaired red blood cell production.

8. Supports Eye Health

Vitamin B12’s role in maintaining healthy homocysteine levels may also support overall eye health.

Research has explored the relationship between vitamin B12, folate, and visual wellness in aging adults. Vitamin B12 also supports nerve health, which is important for maintaining normal eye function.

What Happens When Vitamin B12 Levels Are Low?

Not getting enough vitamin B12 through diet or absorption may lead to low vitamin B12 levels.

Possible signs associated with low vitamin B12 levels include:

General Symptoms

• Fatigue
• Weakness
• Reduced appetite
• Weight changes
• Sore mouth or tongue
• Digestive discomfort

Neurological Symptoms

• Tingling sensations in the hands and feet
• Muscle weakness
• Balance difficulties
• Vision changes

Psychological Symptoms

• Mood changes
• Difficulty concentrating
• Memory concerns

If you suspect low vitamin B12 levels, it’s important to speak with a healthcare professional for proper evaluation.

People Who May Be at Higher Risk of Low Vitamin B12 Levels

Vegetarians and Vegans

Vitamin B12 is naturally found mainly in animal-based foods such as meat, fish, eggs, and dairy products. People following plant-based diets may need fortified foods or supplements to support adequate intake.

Older Adults

As people age, the body may become less efficient at absorbing vitamin B12 due to changes in stomach acid production.

People with Pernicious Anemia

Pernicious anemia affects intrinsic factor production, which is necessary for vitamin B12 absorption.

People with Gastrointestinal Conditions

Conditions such as Crohn’s disease and celiac disease may interfere with nutrient absorption.

People Who Have Had Gastrointestinal Surgery

Certain digestive surgeries may affect the body’s ability to absorb vitamin B12 properly.

People Taking Certain Medications

Some medications that affect stomach acid levels may reduce vitamin B12 absorption over time.

How Does the Body Absorb Vitamin B12?

The body absorbs vitamin B12 in two main steps:

1. Stomach acid separates vitamin B12 from proteins in food.
2. Vitamin B12 combines with intrinsic factor, a protein produced in the stomach, allowing absorption in the intestines.

Vitamin B12 found in supplements is not attached to protein, so it does not require the same separation process as food-based vitamin B12.

In some cases, healthcare providers may recommend higher-dose supplements or vitamin B12 injections when absorption is impaired.

Takeaway: Supporting Your Daily Vitamin B12 Intake

Vitamin B12 is an essential nutrient that supports red blood cell production, nervous system function, DNA synthesis, and energy metabolism.

Some people can meet their vitamin B12 needs through diet alone, while others may benefit from supplementation due to dietary preferences or absorption challenges.

These supplements are formulated using bioavailable forms of B vitamins and are designed for convenient daily use.

For 100% natural vitamin B12 supplements that work, the go-to store is Why Not Natural. We have three excellent vitamin B12 supplement options.

The first is Why Not Natural Methylcobalamin B12 Dietary Supplement. It is 100% natural, highly potent, and uses the bioactive form of B12 readily absorbed by the body. It has a graduated dropper for easy dosing. Lastly, it has an organic cherry flavor, giving it a delicious taste.

The second is Why Not Natural Methyl B12 + Folate Dietary Supplement. This supplement adds the goodness of folate to vitamin B12, making it excellent for men and women of childbearing age (for reproductive benefits). It’s also 100% natural, highly potent, and readily absorbable. Plus, it has a dropper for easy dosing.

The third option is the Why Not Natural B Complex, which contains all 8 B vitamins. It's tangerine flavored, uses the bioavailable form of B12 and all other B vitamins, and also contains a marked dropper for easy dosing.

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Disclaimer

The statements in this article have not been evaluated by the Food and Drug Administration. The products mentioned are not intended to diagnose, treat, cure, or prevent any disease. Please check with a doctor before starting any new supplement and to ensure the advice in this article is right for you.

Sources

• National Institutes of Health Office of Dietary Supplements. Vitamin B12 Fact Sheet for Health Professionals.
• Harvard T.H. Chan School of Public Health. Vitamin B12.
• Mayo Clinic. Vitamin B12 Deficiency Overview.
• National Library of Medicine. Vitamin B12 and Cognitive Function Research.
• Cleveland Clinic. Pernicious Anemia and Vitamin B12 Deficiency.