Vitamin B12 deficiency is way more common in women than you think. This condition is mostly left untreated because the early symptoms are often misunderstood as exhaustion or tiredness.

However, if it is left untreated for too long, it could affect your energy levels, nervous system, brain function, and the production of healthy red blood cells.

Vitamin B12 Deficiency is more common in women who consume a vegetarian or a vegan diet because plant-based foods generally do not naturally contain vitamin B12. Most vitamin B12 comes from animal-based foods.

Let’s understand the causes, the symptoms to watch for, and when you should seek medical advice.

Read our guide on 10 Warning Signs of Low Hemoglobin in Women if you’d like to understand another common nutritional deficiency that affects women.

What Is Vitamin B12?

Vitamin B12, also known as cobalamin, is a very important nutrient to keep your body healthy. It helps in producing red blood cells and supports the functioning of the brain and nervous system. Vitamin B12 is also essential for making DNA, the genetic material of every cell.

If your body doesn’t get enough vitamin B12, it cannot produce healthy red blood cells, and the red blood cells become larger than normal and cannot carry oxygen efficiently throughout the body.

This would lead to vitamin B12 deficiency anemia, which also causes symptoms like fatigue, weakness, dizziness, and shortness of breath.

Why Are Women More Likely to Develop Vitamin B12 Deficiency?

Although it can affect anyone, women are considered to be more vulnerable because of certain stages of life and medical conditions.

1. Vegetarian or Vegan Diets

Vitamin B12 is naturally found in animal-based foods. Women who have a vegetarian or vegan diet may not get enough vitamin B12. For that, you need to have fortified foods or supplements to fulfill your requirements.

2. Pregnancy

During pregnancy, the nutritional requirements of the mother increase to support the growth of the baby. If a woman has low vitamin B12 levels before pregnancy, then she can become deficient if they do not consume enough vitamin B12-rich foods or supplements.

3. Breastfeeding

Breastfeeding mothers need more vitamin B12 to support both their own health and their baby’s healthy development. If the woman does not have enough vitamin B12-rich foods or supplements, it would lead to a deficiency.

4. Increasing Age

When a woman gets older, her stomach produces less acid, which makes it difficult for her body to absorb vitamin B12. This is one of the reasons why vitamin B12 deficiency becomes more common in older age.

5. Digestive Disorders

Certain digestive conditions can affect the body’s ability to absorb vitamin B12 properly. These include:

• Celiac disease
• Crohn’s disease
• Pernicious anemia
• Conditions affecting the stomach or small intestine
• Previous stomach or intestinal surgery

6. Certain Medications

Some medicines can interfere with vitamin B12 absorption, especially when you take them for a long time. These include:

• Metformin, commonly used to treat type 2 diabetes.
• Proton pump inhibitors (PPIs), such as omeprazole, used to reduce stomach acid.
• Long-term use of antacids.

If you take these medicines regularly, your healthcare professional may recommend monitoring your vitamin B12 levels.

Warning Signs of Vitamin B12 Deficiency in Women You Shouldn’t Ignore

1. Constant Fatigue and Low Energy

One of the most common and earliest signs of B12 deficiency in women is constant tiredness. B12 helps in producing red blood cells, which helps in carrying oxygen throughout the body, and if you don’t have enough B12, your body doesn’t produce enough red blood cells, which leads to a reduction in the amount of oxygen.

Read our article 25 Best Iron-Rich Foods for Women to understand the difference between iron deficiency and vitamin B12 deficiency.

2. Weakness

Persistent weakness is another common symptom of B12 deficiency. Since your muscles receive less oxygen and nutrients, they may not function efficiently. Many women notice that routine tasks become more difficult than before.

3. Tingling or Numbness in the Hands and Feet

B12 plays an important role in maintaining healthy nerves. A deficiency can cause damage in the protective covering around nerves called myelin sheath, leading to tingling or numbness in hands and feet.

4. Difficulty Concentrating and Brain Fog

Many women with B12 deficiency have a hard time focusing, remembering, or completing everyday tasks. Since the brain depends on healthy nerves and a good oxygen level, low B12 levels can affect memory, concentration, and overall brain function.

5. Mood Changes, Anxiety, or Depression

Low B12 levels may also affect your mental health. Some women experience increased mood swings, anxiety, or symptoms of depression. Although B12 deficiency is not the only cause of these conditions, improving B12 levels may improve symptoms.

6. Pale or Slightly Yellow Skin

A lack of B12 reduces the production of healthy red blood cells, making your skin appear pale. In some cases, the skin may develop a slight yellowish color because of damaged red blood cells. If pale skin occurs together with fatigue or weakness, it may be a sign of anemia caused by vitamin B12 deficiency.

7. Shortness of Breath and Dizziness

When your body doesn’t produce enough healthy red blood cells, less oxygen reaches throughout your body. This can make you feel breathless after mild physical activity, such as walking or climbing stairs. Some women also experience dizziness, especially when standing up quickly.

8. Difficulty Walking or Poor Balance

B12 is essential for maintaining healthy nerves that control movement. If it is left untreated, some women develop poor balance, difficulty walking, or feel unsteady on their feet. These symptoms are more common in older adults but can occur at any age.

9. Blurred Vision

Although it is less common, severe B12 deficiency can affect the optic nerve, which carries visual information from the eyes to the brain. This may lead to blurred or disturbed vision. Vision changes caused by deficiency are quite rare but should always be evaluated by a healthcare professional to determine the cause.

Best B12-Rich Foods for Women

Eating foods rich in B12 is one of the best ways to maintain healthy B12 levels.

Animal-Based Foods

These are naturally rich sources of B12:

• Beef liver
• Chicken liver
• Salmon
• Tuna
• Sardines
• Mackerel
• Eggs
• Milk
• Yogurt
• Cheese
• Chicken
• Lean beef

Vegetarian Sources

Since plant foods do not naturally contain B12, vegetarians should choose fortified foods such as:

• Fortified breakfast cereals
• Fortified plant-based milk (soy, almond, oat)
• Fortified nutritional yeast

Women following a vegetarian or vegan diet should discuss vitamin B12 supplements with their healthcare professional.

How Is B12 Deficiency Diagnosed?

If your healthcare professional suspects B12 deficiency, they may recommend one or more tests, including:

• Complete Blood Count (CBC)
• Serum Vitamin B12 Blood Test
• Serum Folate Test
• Methylmalonic Acid (MMA) Test (in certain cases)
• Homocysteine Test (when needed)

These tests help determine whether your symptoms are caused by B12 deficiency or another medical condition.

How Is B12 Deficiency Treated?

Treatment depends on the cause and severity of the deficiency.

For mild deficiency, your healthcare professional may recommend:

• Eating more B12-rich foods
• B12 supplements

If the deficiency is moderate to severe or caused by poor absorption, treatment may include:

• High-dose B12 tablets
• B12 injections
• Treating the underlying medical condition

Most women feel much better within a few weeks of treatment, but full recovery can take longer depending on how severe the deficiency is.

You should never start high-dose B12 supplements without medical advice. Although B12 is generally considered safe, treating the cause is equally important.

Read Heavy Periods (Menorrhagia): Causes, Symptoms & Treatment to learn more.

Frequently Asked Questions

1. What are the first signs of B12 deficiency in women?

The earliest signs often include fatigue, weakness, dizziness, tingling or numbness in the hands and feet, poor concentration, and mood changes. Most of the women mistake them for stress or lack of sleep.

2. Which foods are highest in B12?

Some of the best sources of B12 include beef liver, chicken liver, salmon, tuna, sardines, eggs, milk, yogurt, cheese, and fortified breakfast cereals.

3. Can vegetarians become B12 deficient?

Yes. Since B12 is naturally found mainly in animal-based foods, vegetarians and especially vegans have a higher risk of deficiency unless they regularly consume fortified foods or vitamin B12 supplements.

4. Can B12 deficiency cause hair loss?

Hair loss is not usually the primary symptom of vitamin B12 deficiency, but it can occur in some people. Hair loss may have many causes, including iron deficiency, hormonal changes, thyroid disorders, and nutritional deficiencies.

5. How long does it take to recover from B12 deficiency?

Many women begin to notice improvement within a few weeks after starting treatment. However, restoring vitamin B12 stores and recovering from nerve-related symptoms may take several months, depending on the severity of the deficiency.

6. Can B12 deficiency cause anxiety or depression?

Yes. Low vitamin B12 levels can affect the nervous system and may contribute to mood changes, anxiety, irritability, or depression in some people. However, these symptoms can have many causes, so a proper medical evaluation is important.

7. Is B12 deficiency permanent?

Not usually. Most cases improve with appropriate treatment, such as dietary changes, supplements, or vitamin B12 injections. However, if the deficiency is left untreated for a long time, some nerve damage may become permanent.

Vitamin B12 deficiency in women is common but often ignored because its symptoms develop gradually. Fortunately, it is usually treatable when diagnosed early. Eating vitamin B12-rich foods, identifying the cause, and following the treatment recommended by your healthcare professional can help restore healthy vitamin B12 levels and prevent serious complications. If you notice persistent symptoms, consult a healthcare professional rather than ignoring them.