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Vitamin B12

Check your active vitamin B12 levels with our home finger prick blood test kit analysed at one of our UKAS accredited UK labs.

This health check measures the active form of B12 which is the most accurate means of measuring your level of vitamin B12 (as opposed to total B12). Active B12 is the best early indicator of B12 deficiency.  

Vitamin B12 (along with folate) plays an essential role in the formation of red blood cells and also has a key role in nerve health. The human body doesn’t produce Vitamin B12, so it has to be absorbed through diet. Low levels of this essential vitamin can leave you feeling tired and weak while prolonged deficiency can lead to anaemia.

Finger prick
Estimated turnaround
2 days
From receipt of sample

Why check Vitamin B12 ?

  • You want to check levels to ensure your diet is ok
  • You are suffering from low energy levels
  • You want to guard against anaemia
  • You want to check if you need to supplment or are over-supplementing

Benefits of vitamin B12 testing

By taking our home vitamin B12 blood test, you can get fast and accurate insights into your vitamin B12 levels.

If you’re experiencing a lack of energy or feelings of weakness, this test could identify whether a B12 deficiency is at the root of those issues.

By the same token, those who are simply being proactive about assessing their health and guarding against any future deficiency or anaemia will benefit from this accurate insight into existing levels.

Given that the body does not produce vitamin B12, our intake has to come from diet, a blood test to check your levels is an excellent indicator as to whether improvements might be needed to your diet in order to prevent a deficiency.

Our check includes a quick and simple finger prick test carried out at home. Your results will be made available in a simple, easy to read dashboard, where you can also track your levels over time and gain information, tips and advice on how to improve.

Biomarkers included in this package

Vitamins & minerals

Active B12

How it works

Collect sample

We will send you a finger prick kit to use at home

Post sample

Pop your sample in the post to us using a pre-paid envelope

Online results

View your results on your secure personal health dashboard

What our customers say

I enlisted the help of Forth to help me get to the bottom of my current health concerns. The test was really easy to and my results were available within day. Using Forth has helped me take the action needed to get my hormones back on track.

Holly Rush, 39

I suffer from a hereditary condition which causes my body to store too much iron.  My biggest issue before using Forth was getting an appointment with my GP.  Now using Forth I can track my iron quickly and easily and take action before levels start to affect my health

Mark Threfall, 29

I'd put off getting regular blood tests before because of the long-winded process of a GP visit. Forth has changed all that. The process is very quick and very easy, with thorough, well-explained results delivered to your inbox within days.

Alice Hector

Forth really helped me understand issues that I was having, which in the end turned out to be problems with iron absorption. Without their test I would never have known this. I now have the knowledge I need to improve.

Sean Conway

As a working mum, I often find myself training ‘tired’ as the demands of day-to-day life take their toll.  Forth has enabled me to gain a valuable insight into what is happening ‘under the surface’, so I  can adapt my training and lifestyle.

Kate Allan

I ran my first marathon in 2014 which left me feeling exhausted and constantly unwell. What I didn’t know then was that my iron and vitamin D levels were incredibly low.  By using Forth to test key biomarkers has put me in control of the areas I need to improve.

Jude Peck, 42

Taking the test is simple just make sure you follow all the instructions so you follow the correct procedures. The customer service is second to none and the results are easy to understand and follow.

Matthew Bottrill

I was keen to use Forth’s service to help monitor my haematological markers in particular since I've had problems in the past and by the time they are picked up by the GP I'm normally feeling unwell.  The test was quick and easy to do and results were back very quickly. The results are also incredibly accurate, being almost identical to those from tests done by my GP the same day.

Alice Lethbridge

As a former Olympic cyclist I always wanted to look after my health. This has never changed to this day but become a lot easier via Forth, it’s the only way to really understand your own body. 

Brian Smith

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