Vitamin B12

Understand vitamin B12 or get instant access to AHPRA-accredited online doctors and medical practitioners via telehealth, 24/7, within 15 minutes.

This guide does not replace professional care. In emergencies, call 000 or visit a hospital immediately.

About vitamin B12

Vitamin B12, also known as cobalamin, is an essential water-soluble vitamin that plays a crucial role in maintaining nerve health, supporting red blood cell formation, and aiding DNA synthesis. It is particularly important for brain function and energy production, as it helps in the conversion of food into usable energy. Since the body does not produce vitamin B12 on its own, it must be obtained from dietary sources such as meat, fish, dairy products, and fortified foods, or through supplements. A deficiency in vitamin B12 can lead to anemia, fatigue, neurological issues, and even cognitive impairments if left untreated. People following a vegetarian or vegan diet, older adults, and those with certain medical conditions affecting absorption, such as pernicious anaemia or gastrointestinal disorders, are at a higher risk of deficiency.

Medically reviewed by Dr. Ammar AL-ANI, MBChB, CCBST, AMC

You should consider consulting a GP for a vitamin B12 test if you experience symptoms of deficiency or have risk factors that may lead to low B12 levels. Common signs that indicate a need for testing include:

  • Persistent fatigue: Low B12 levels can lead to tiredness and low energy.
  • Tingling: Nerve-related symptoms such as pins and needles in the hands and feet may indicate a deficiency.
  • Memory problems: B12 plays a crucial role in brain function, and low levels can lead to cognitive issues.
  • Pale or yellowish skin: B12 deficiency can cause changes in skin tone due to its role in red blood cell production.
  • Dizziness: These symptoms can result from anaemia caused by B12 deficiency.
  • Digestive issues: Conditions like Crohn’s disease, celiac disease, or gastric surgery may reduce B12 absorption.
  • Vegetarian diet: Since B12 is mainly found in animal products, those following plant-based diets may be at risk.

Vitamin B12 deficiency occurs when the body does not get enough B12 from the diet or cannot absorb it properly. Since B12 is essential for red blood cell formation, nerve function, and DNA production, its deficiency can lead to serious health issues.

1. Inadequate dietary intake

People who do not consume enough B12-rich foods are at a higher risk of deficiency. This includes:

  • Vegans and vegetarians: B12 is primarily found in animal products like meat, eggs, and dairy.
  • Older adults: May have reduced appetite or dietary restrictions leading to insufficient B12 intake.

2. Malabsorption issues

Even if a person consumes enough B12, their body may not absorb it properly due to:

  • Pernicious anaemia: An autoimmune condition where the stomach does not produce enough intrinsic factor (a protein needed for B12 absorption).
  • Gastrointestinal disorders: Conditions like Crohn’s disease, celiac disease, and atrophic gastritis can reduce absorption.
  • Weight loss surgery: Procedures like gastric bypass remove parts of the stomach and intestines, limiting B12 absorption.

3. Low stomach acid production

  • Stomach acid is essential for breaking down B12 from food. Older adults and individuals taking acid-reducing medications (such as PPIs or H2 blockers) are at a higher risk.
  • H. pylori infection: This bacteria, linked to stomach ulcers, can affect B12 absorption.

4. Alcoholism: Excessive alcohol consumption can damage the stomach lining and interfere with nutrient absorption, including B12.

5. Pregnancy and breastfeeding: Pregnant and breastfeeding women need higher B12 levels to support fetal and infant development. If they have low B12 intake, both the mother and baby may be at risk of deficiency.

  • Identifies B12 deficiency, which can cause fatigue, nerve issues, and cognitive problems.
  • Helps diagnose pernicious anaemia, a condition where the body can’t absorb B12 properly.
  • Assesses B12 levels in people at higher risk, such as vegetarians, vegans, or those with digestive disorders.
  • Monitors B12 levels in individuals receiving B12 injections or supplements.

Preventing and managing vitamin B12 deficiency

  • Eat B12-rich foods such as meat, eggs, dairy, and fortified cereals.
  • Take B12 supplements if you are at risk, especially if you follow a vegan or vegetarian diet.
  • Get regular blood tests to monitor levels, especially if you have a medical condition affecting absorption.
  • Consult an online doctor for a B12 test, prescriptions, or referrals via telehealth.

Yes, Vitamin B12 plays a key role in brain function and mood regulation. A deficiency can contribute to depression, anxiety, irritability, and even hallucinations. Supplementing with B12 may help improve mood, especially in individuals with low levels. Speak to your GP if you think your vitamin B12 is causing mental health issues. Hola Health offers 100% fully bulk-billed mental health care plans.

Yes, telehealth is a safe and effective option for diagnosing and managing Vitamin B12 deficiency. It allows you to receive quick medical advice, prescriptions, referrals, and pathology requests without the need for in-person visits—ensuring timely care and convenience.
Yes! Hola Health provides online referrals for blood tests, including Vitamin B12 testing. You can consult with a registered practitioner via telehealth, and if needed, they will issue a pathology referral that you can take to a nearby lab for testing.

Hola Health provides online referrals if further assessment is needed or if your vitamin B12 deficiency is causing other issues. Hola Health provides referrals to

Yes, if a doctor determines that you need Vitamin B12 medicine, they can issue an eScript. The prescription will be sent via SMS, allowing you to pick up your supplements at a local pharmacy or opt for home delivery.

Yes! All doctors available through Hola Health are AHPRA-accredited, meaning they hold the same medical qualifications and licensing as in-person GPs.
Yes, Hola Health offers 24/7 telehealth consultations, meaning you can speak to a 24-hour doctor anytime, even after hours and on public holidays.

Connect with licensed online doctors 24/7 and quickly obtain medical certificates, online prescriptions, and specialist referrals, all without leaving home. Telehealth helps in the following ways:

  • Online GP consultations: Speak with an AHPRA-registered doctor via telehealth, often within 15 minutes.
  • Round-the-clock access: Get medical support from a 24-hour doctor, no matter where you are in Australia.
  • Online scripts: Secure fast online prescriptions, approved by a licensed doctor.
  • Medical certificates: Request a doctor’s certificate online for work, school, or carer duties, all without a clinic visit.
  • Online referrals: Receive GP referrals for specialists, pathology, and radiology tests without waiting for an in-person appointment.
  • Mental health support: Access bulk-billed mental health care plans from experienced professionals through telehealth.

Instantly connect to a registered practitioner within 15 minutes from anywhere in Australia, 24/7 for:

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