Total vitamin B12 blood test in London

Get an Total vitamin B12 blood test delivered straight to your door in London. Track what’s going on inside your body and improve your health.

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Florence Nightingale, the founder of modern nursing, was born in London.

What is Vitamin B12?

Total B12 is the total amount of vitamin B12 in your blood. This includes active vitamin B12 which can be used by your body, as well as inactive vitamin B12, which can't.

Vitamin B12 plays a really important role in red blood cell production and helps your nervous system to function properly.


What is its function?

Vitamin B12 plays a key role in forming red blood cells — which carry oxygen around your body.

Vitamin B12 is also important for a healthy nervous system and plays a role in protecting against heart disease.


What can cause it to change?

A number of things can cause vitamin B12 deficiency, these include:

  • pernicious anaemia — your immune system mistakenly attacks cells in your stomach that produce intrinsic factor (which you need to absorb vitamin B12)
  • diet — vegan, vegetarian, and dairy-free diets are sometimes lacking in vitamin B12
  • medication — some medications, like proton pump inhibitors (PPIs), can inhibit absorption of vitamin B12

You’re also more at risk of vitamin B12 deficiency if you:

  • are pregnant or breastfeeding
  • are over 50 years — because you might stop producing enough hydrochloric acid in your stomach which is needed for absorption of vitamin B12
  • suffer from a gastrointestinal disorder — like coeliac disease or Crohn’s disease

What are the most common symptoms?

If you don't get enough vitamin B12, it can lead to anaemia — meaning your body can't transport around enough oxygen. It can also lead to nerve damage, balance issues, and psychological issues.

Symptoms of vitamin B12 deficiency can include:

  • tiredness
  • lack of energy
  • a sore red tongue
  • mouth ulcers
  • pins and needles
  • muscle weakness
  • disturbed vision
  • mood changes
  • feeling depressed
  • memory problems

What factors within my control could influence it?

Diet You can increase your vitamin B12 levels by eating foods high in vitamin B12 like:

  • organ meats — like liver and kidney are the richest sources of vitamin B12
  • beef
  • fish — like clams, sardines, salmon, and tuna
  • milk and dairy products
  • eggs

Vitamin B12 is only naturally available in meat, fish, and dairy. But there are fortified plant-based sources of vitamin B12 like:

  • fortified milk alternatives
  • fortified cereals
  • fortified nutritional yeast

Supplements If you're not getting enough vitamin B12 from your diet, you might need a supplement. It’s usually available as cyanocobalamin — a form which your body can easily convert and use. It’s also possible to get a vitamin B12 injection — this is especially useful if your deficiency is caused by absorption issues in your stomach. The form hydroxocobalamin can be given every three months.

What is Thriva?

We’re a subscription-based health tracking company. With our blood testing kits you can take control of your health and see exactly what’s happening inside your body. Learn what lifestyle really works for you and improve everything from your sleep and energy levels to your heart health.

01

Order online and choose how often you’d like a test. We’ll post your kit and it’ll be in your hands the very next day.

02

Your kit contains everything you need for your simple finger-prick blood test. When you’re done, use the freepost envelope to send it back.

03

Your full results, along with a personalised report from a qualified GP, will be available to access online.

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