Vitamin B12: Why This Essential Nutrient Matters More Than You Think

Feeling tired even after a full night's sleep? Finding it difficult to concentrate at work? Experiencing tingling in your hands or feet that won't go away? While these symptoms can be caused by many different health conditions, one common and often overlooked cause is vitamin B12 deficiency.

Vitamin B12 is an essential nutrient that plays a critical role in keeping your body functioning properly. It supports healthy blood cells, protects your nervous system, contributes to brain function and helps your body convert the food you eat into usable energy. Yet because the body cannot produce vitamin B12 on its own, we rely entirely on our diet—or in some cases, supplements or injections—to maintain healthy levels.

The challenge is that vitamin B12 deficiency often develops slowly. Many people dismiss the early symptoms as stress, ageing or simply being busy. Without treatment, however, a deficiency can lead to anaemia, nerve damage and problems with memory and concentration.

The good news is that vitamin B12 deficiency is usually easy to diagnose and, in most cases, highly treatable. Understanding the signs, knowing who is at risk and recognising when to seek medical advice can help protect your long-term health.

What Is Vitamin B12?

Vitamin B12, also known as cobalamin, is a water-soluble vitamin required for many essential processes throughout the body. Unlike some nutrients, your body cannot make vitamin B12 itself, meaning it must come from dietary sources or supplements.

Although the liver can store vitamin B12 for several years, those stores eventually become depleted if your body isn't receiving enough or is unable to absorb it properly. This is why deficiency often develops gradually rather than suddenly.

Vitamin B12 is involved in almost every system of the body, making it one of the most important vitamins for overall health.

Why Is Vitamin B12 So Important?

Every day, your body depends on vitamin B12 to keep your blood, nerves and brain functioning normally.

What Vitamin B12 Does	Why It Matters
Produces healthy red blood cells	Helps transport oxygen around the body and prevents certain types of anaemia.
Supports the nervous system	Maintains the protective coating around nerves, helping them send signals effectively.
Promotes brain function	Supports memory, concentration and cognitive health.
Helps produce DNA	Essential for healthy cell growth, repair and renewal.
Assists energy metabolism	Helps convert food into energy your body can use.

Because vitamin B12 affects so many body systems, even a mild deficiency can have a noticeable impact on your health and wellbeing.

Who Is Most at Risk of Vitamin B12 Deficiency?

Although anyone can develop vitamin B12 deficiency, some people are more likely to experience low levels than others.

Higher-Risk Group	Why They're at Risk
Adults over 60 years	Ageing reduces stomach acid, making vitamin B12 harder to absorb.
Vegetarians and vegans	Most natural sources of vitamin B12 come from animal-based foods.
People taking metformin	Long-term use may reduce vitamin B12 absorption.
People taking reflux or stomach acid medications	Reduced stomach acid can interfere with vitamin B12 absorption.
People with coeliac disease or Crohn's disease	Digestive conditions can reduce the body's ability to absorb nutrients.
People who have had stomach or bowel surgery	Surgery may affect the digestive system's ability to absorb vitamin B12.
People with pernicious anaemia	An autoimmune condition that prevents normal vitamin B12 absorption.

If you fall into one of these groups, your GP may recommend regular monitoring of your vitamin B12 levels, particularly if you begin experiencing symptoms.

Signs and Symptoms of Vitamin B12 Deficiency

One of the challenges with vitamin B12 deficiency is that the symptoms often develop slowly. They may be mild at first and easily mistaken for stress, ageing or lack of sleep.

As the deficiency progresses, symptoms can become more noticeable.

Common Early Symptoms	Symptoms That May Develop if Deficiency Progresses
Fatigue and low energy	Numbness or tingling in the hands and feet
Weakness	Difficulty walking or poor balance
Dizziness	Memory problems
Shortness of breath	Confusion or difficulty concentrating
Pale skin	Depression or mood changes
Headaches	Ongoing nerve damage if left untreated

Some people may also experience a sore or swollen tongue, mouth ulcers, reduced appetite, unexplained weight loss and irritability.

Because these symptoms are common to many medical conditions, it's important not to self-diagnose. A simple consultation and blood test can help identify whether vitamin B12 deficiency is contributing to your symptoms.

Where Does Vitamin B12 Come From?

Vitamin B12 is naturally found in foods of animal origin. People who eat a balanced diet containing meat, dairy or seafood usually obtain enough vitamin B12, although absorption may still become a problem with age or certain medical conditions.

Food	Vitamin B12 Source
Beef and lamb	Excellent source
Fish including salmon, tuna and sardines	Excellent source
Chicken	Good source
Eggs	Good source
Milk	Good source
Cheese and yoghurt	Good source
Liver	One of the richest natural sources
Fortified breakfast cereals	Suitable for vegetarians
Fortified plant-based milks	Helpful for vegans

People following a vegan diet usually require a reliable vitamin B12 supplement or regularly consume fortified foods, as plant foods do not naturally contain adequate amounts.

How Much Vitamin B12 Do You Need?

According to Australian nutritional recommendations, most adults require approximately 2.4 micrograms (mcg) of vitamin B12 each day.

Requirements increase slightly during pregnancy and breastfeeding to support both mother and baby.

Although the daily requirement is relatively small, maintaining healthy vitamin B12 levels is essential because your body depends on a continuous supply to perform many vital functions.

How Is Vitamin B12 Deficiency Diagnosed?

If you're experiencing symptoms or have risk factors for deficiency, your GP will begin by discussing your medical history, medications and diet before recommending appropriate investigations.

Diagnosis usually involves a blood test.

Test	Purpose
Vitamin B12 level	Measures vitamin B12 in the bloodstream.
Full blood count	Checks for anaemia and changes in red blood cells.
Folate level	Identifies another vitamin deficiency that can produce similar symptoms.
Iron studies	Helps assess other possible causes of fatigue and anaemia.

Depending on your circumstances, additional tests may be recommended to determine why vitamin B12 levels are low.

Early diagnosis is particularly important because neurological symptoms can become permanent if treatment is delayed.

How Is Vitamin B12 Deficiency Treated?

Treatment depends on both the severity of the deficiency and its underlying cause.

Treatment	When It May Be Recommended
Dietary changes	For mild deficiency caused by inadequate dietary intake.
Oral vitamin B12 supplements	Suitable for many people with dietary deficiency or those following vegetarian or vegan diets.
Vitamin B12 injections	Often recommended when absorption is impaired, such as with pernicious anaemia or after stomach surgery.
Ongoing monitoring	Regular blood tests help ensure treatment is working and vitamin B12 levels remain healthy.

Many people notice an improvement in their symptoms within weeks of starting treatment, although recovery of nerve-related symptoms may take longer if the deficiency has been present for some time.

Can You Take Too Much Vitamin B12?

Vitamin B12 is generally considered safe, and excess amounts are usually excreted in the urine.

However, this doesn't mean everyone should take supplements without medical advice.

High-dose supplements may not provide additional benefits if your vitamin B12 levels are already normal. If you're concerned about fatigue or suspect a deficiency, it's best to speak with your GP rather than starting supplements on your own.

Simple Ways to Maintain Healthy Vitamin B12 Levels

Maintaining healthy vitamin B12 levels often comes down to good nutrition and recognising when you may be at increased risk.

Eating a balanced diet that includes vitamin B12-rich foods, choosing fortified foods or supplements if you follow a vegetarian or vegan diet, attending regular health checks as you get older, and discussing vitamin B12 monitoring if you take metformin or long-term reflux medication can all help reduce your risk of deficiency.

If you develop ongoing fatigue, numbness or unexplained neurological symptoms, it's important to seek medical advice rather than assuming these symptoms are simply part of ageing.

When Should You See Your GP?

While occasional tiredness is common, persistent symptoms should never be ignored.

You should consider booking an appointment if you experience ongoing fatigue that doesn't improve with rest, tingling or numbness in your hands or feet, problems with balance or walking, memory or concentration difficulties, frequent dizziness, pale skin, symptoms of anaemia, or a sore tongue and recurring mouth ulcers.

These symptoms don't always indicate vitamin B12 deficiency, but they do deserve proper medical assessment.

How Classic Way Family Practice Can Help

At Classic Way Family Practice, we provide comprehensive assessments for patients experiencing fatigue, nutritional deficiencies and ongoing health concerns.

How We Can Help
Assess your symptoms and medical history	Arrange blood tests where appropriate
Diagnose vitamin B12 deficiency	Investigate possible underlying causes
Provide dietary and lifestyle advice	Recommend supplements or vitamin B12 injections when clinically indicated
Monitor your recovery	Support your long-term health with preventive care

Whether you're experiencing persistent fatigue, following a vegetarian or vegan diet, or simply want reassurance about your health, our team is here to help.

Key Takeaways

Vitamin B12 is much more than just another vitamin. It plays an essential role in producing healthy blood cells, protecting your nervous system and supporting brain function. Because deficiency often develops gradually, it's easy to overlook the early warning signs until they begin affecting your daily life.

Fortunately, vitamin B12 deficiency is usually straightforward to diagnose with a blood test and can often be treated effectively through dietary changes, supplements or injections, depending on the underlying cause.

If you've been feeling unusually tired, experiencing tingling sensations or have concerns about your vitamin B12 levels, don't ignore the symptoms. Speaking with your GP can provide answers, reassurance and, if needed, timely treatment to help you feel your best.

Contact Us

If you're experiencing persistent fatigue, numbness, tingling, memory concerns, or think you may be at risk of vitamin B12 deficiency, the team at Classic Way Family Practice is here to help. Our experienced GPs can assess your symptoms, arrange appropriate blood tests, and provide personalised advice and treatment to support your health.

Classic Way Family Practice

Phone: (07) 5568 0600 Email: [email protected] Address: 2/6 Classic Way, Burleigh Waters QLD 4220

Opening Hours

Monday to Friday: 7:30 AM – 5:00 PM Sunday & Public Holidays: 9:00 AM – 1:00 PM

Book an appointment today to discuss your symptoms or arrange a preventive health check. Early diagnosis and treatment can make a significant difference to your long-term health and wellbeing.