Introducing our premium blood tests: The Well Woman & The Well Man!

The Vitamin B12 Blood Test

Did you know your body can’t make B12 by itself? Get insights into your B12 levels with this quick test. 

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Finger prick test kit provided
1 biomarker tested
Results in app within 48 hours
Doctor-reviewed report
Free delivery
18+ only

Is it for me?

You’ll want to test your B12 levels if:

You already take B12 supplements and want to monitor your levels.
You don’t eat much meat, fish and dairy (for example, a vegan diet).
You’re concerned your B12 may be low. Common symptoms include: extreme tiredness, mouth ulcers and low energy.

Great test!

'It was helpful to see exactly where my results placed in relation to normal ranges.'


What's tested?

Vitamins are essential micronutrients that your body needs to function normally. When you’re lacking in vitamins long-term, it can lead to various health problems, so getting the right amount you need is vital.
Necessary for red blood cell production, cell and tissue repairs, and overall nerve health.

Meet our experts

Get to know our in-house clinicians

Dr Leah Gorodi

Medical Lead and GP with a special interest in lifestyle medicine and health prevention

doctor taran toor

Dr Taran Toor

Chief Medical Officer, clinical entrepreneur and GP with an interest in digital health

UKAS accredited

Get your results within 48 hours from UKAS-accredited labs.

Your privacy, guaranteed

Just like your doctor, we take your privacy extremely seriously.

Your data is secure. We use the latest encryption technologies and we’re committed to our data protection responsibilities.

Your data is never sold on, rented out, or shared with third parties for financial advantage.

We work with Care Quality Commission-accredited labs and our blood test kits are all CE-marked.


B12 is a key vitamin we get from our diets. It’s needed for a bunch of bodily functions, including red blood cell production, tissue and cell repair, and nerve health.

Vitamin B12 deficiency is common, even though it’s naturally found in many animal foods like meat, fish, eggs and dairy. That’s why if you’re a long-term vegan or vegetarian, it’s wise to check your B12 levels regularly.

But you don’t just have to be a vegan or vegetarian to be deficient in B12. If you have any symptoms such as tiredness, low energy, mouth ulcers, breathlessness, pale skin or headaches, these may be a sign of B12 deficiency.


When you have low vitamin B12 levels, you may get the following symptoms:

  • tiredness
  • headaches
  • pale skin
  • low mood

If your B12 levels are particularly low, then mouth ulcers, pins and needles, and extreme tiredness are common. Keeping track of your levels is crucial to prevent any long-term damage to your body.

No, you don't need to fast before this test.

This is a total B12 blood test. It tests for your body's total B12 levels, both active and inactive.

Talk to your doctor before taking this test. Being pregnant can have a noticeable impact on your results, so make sure to check in with your GP first.