Vitamin D and B12 Combo Test

Get insight into your key vitamin levels with this simple to use at home test combination test. With many commonly shared symptoms such as fatigue, low energy and depression, it can be hard to know if you have a Vitamin D or B12 deficiency without testing.

  • Free shipping
  • A doctor validated report
  • Fast results from sample receipt at lab
  • 7-days per week customer care

Collection method:

Finger-prick sample


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More about this test

The major form of vitamin D found and measured in your blood is 25-hydroxyvitamin D. It is relatively inactive but is the precursor to the active hormone. Vitamin D is also known as the ‘sunshine vitamin’ as most of the vitamin that the body requires is produced through the skin’s exposure to the sun. Vitamin D also comes from the food however it can be difficult to get all that the body requires from just the diet.

Vitamin B12, also known as cobalamin, is an essential vitamin and must therefore be taken in through the diet. It is found predominantly in meat, fish, eggs and dairy products; therefore vegetarians and vegans are at greater risk of low B12 levels, though it can be found in very small quantity in certain algae.

Vitamin B12 is bound to the protein in food and is released during digestion by the stomach acid. When released from the protein a substance called intrinsic factor combines with it to enable absorption into the bloodstream. An autoimmune condition called pernicious anaemia prevents absorption by preventing the production of intrinsic factor; this is a leading cause of vitamin B12 deficiency. Other conditions affecting the stomach or small intestine such as coeliac disease, Crohn’s disease and ulcerative colitis can also lead to inadequate B12 absorption.

• Blood collection device using finger-prick method
• Tracked 24 return mailing bag
• A doctor validated report
• 2 working days turnaround from sample receipt at lab

Order by 3pm weekdays and your test will be the dispatched the same day (excluding bank holidays). Royal Mail tracked 24 shipping is provided free of charge. You will be emailed your tracking number.

This test measures 25-OH vitamin D. Your results will show the level of vitamin D in your blood and whether this level is deficient, insufficient, normal or elevated.

Your results will show the level of vitamin B12 in your blood and whether this level is deficient, insufficient, normal or elevated.

You should take this test before you take any vitamin or mineral supplements. Do not take biotin supplements for 2 days prior to this test. If you are taking prescribed biotin you should discuss this with your doctor.



25-OH vitamin D

Total vitamin B12


What are your opening times?

Our customer care team is available on live chat and telephone: 8am-10pm, Monday – Friday and 8am-4pm on the weekends.

Do you have a medical advisory board?

Dr Gareth James (GP & Medical Director) and Sian Baker (Dip ION mBANT mCNHC Head of Wellbeing Services) make up our medical advisory board. They work with us to ensure that products, lab partners and test result reports are accredited and accurate.

I've purchased a test but I'm unsure how to collect my sample?

Our Helpful Guides page contains both video and illustrated instructions to follow to correctly take your sample.

Are your labs accredited?

We only partner with ISO and UKAS accredited labs.