A single-marker blood test measuring vitamin B12, useful for checking deficiency risk, particularly on a plant-based diet.
1 biomarker as listed by London Medical Laboratory.
Vitamin B12 supports the nervous system and healthy blood, and low levels can affect both over time. It is a particularly common concern for people on a plant-based diet, since B12 is mainly found in animal products, and this test checks that one marker on its own.
At £39 this ties with Medichecks as the cheapest test in its comparison group, undercutting the £46 median by about 15%. Other peers range from £45.25 (Blue Horizon Medicals, two variants) up to £170 (Better2Know's standard Vitamin B12 Test).
Clinical depth is treated as solid because the test measures exactly the single marker it sets out to, and value for money scores well given the below-median price. Collection convenience is high because it can be done entirely at home, and trust signals reflect the provider's CQC registration and doctor-reviewed report as standard.
This is a good option for a quick, low-cost check of B12 status, for example for people following a vegan or vegetarian diet, or anyone with possible deficiency symptoms who wants a first check before speaking to a GP. If you also want folate and vitamin D checked at the same time, London Medical Laboratory's own Vitamin Profile covers all three for £89.
This is a blood test. You can use an at-home finger-prick kit (£3.99 postage), attend a partner clinic for a venous draw (£35), or arrange a phlebotomist home visit. Results are typically ready within a day and are reviewed by a doctor.
This one-marker B12 test costs £39, matching Medichecks as the joint-cheapest in its comparison group and about 15% below the £46 median. It can be done with an at-home finger-prick kit.
The listing publishes a short description, the full biomarker list, a stated turnaround, clear collection options, the sample type; it does not state what the report looks like.
A single-marker test measuring exactly what it sets out to; depth is not the point of this comparison group.
A finger-prick sample you take at home; with a venous or clinic option as well; results in around 1 days, well ahead of the vitamins norm of 3.5.
Results are reviewed by a doctor; the provider does not describe the report format.
No Trustpilot rating on record; CQC registered; doctor review as standard.
£39.00 against a comparison-group median of £46.00 (-15%).
Calculated 13 September 2026 from the facts we hold about this test and provider, using our published scoring formula. Scores are not hand-edited.
This test belongs to our Vitamin B12 test comparison group. See how it stacks up against equivalent tests from other providers.
Tied for cheapest single B12 test, with fast results
This test measures active vitamin B12 on its own, the form of B12 that is actually available for your body to use. It suits people with possible deficiency symptoms, such as fatigue, low energy or memory problems, or a diet or condition that raises their risk.
Fast at-home B12 test, near the median price for its group
Checks active B12 (holotranscobalamin), the form of vitamin B12 taken up and used by your cells, from an at-home sample. Suited to a quick, flexible check on B12 status, including for vegetarians and vegans, who are more at risk of low B12.
Flexible collection, price close to the group average
This blood test measures total vitamin B12, the standard marker for checking B12 status. It suits people who want a straightforward single-marker check rather than the added detail of active B12 or related markers.
Priced above the median for active B12 tests we track
A single-marker blood test measuring active vitamin B12, suited to people at risk of deficiency, including vegetarians and vegans.
At-home B12 test priced right at the group median
An at-home blood test measuring vitamin B12 levels, useful for vegans, vegetarians and anyone with symptoms of low energy or tiredness that could point to a deficiency.
Mid-priced B12 kit, well under Better2Know's clinic price
This at-home finger-prick test checks your vitamin B12 level, a nutrient needed for healthy blood and nerve cells. It suits people who want a quick, independent check for a B12 deficiency without a clinic visit.
Priciest B12 test in a group full of £39-55 options
A single blood test that measures your vitamin B12 level, useful if you want to check for a deficiency affecting energy, mood or nerve health.
Among the priciest B12 tests we compare, bar one
A single blood test measuring Vitamin B12, commonly used to assess levels relevant to nerve function and red blood cell production. Useful for vegans, vegetarians or anyone with absorption concerns.
Why Take the Vitamin B12 Test? Vitamin B12 is a vital nutrient that plays a crucial role in maintaining overall health.
Tied for cheapest single B12 test, with fast results
This test measures active vitamin B12 on its own, the form of B12 that is actually available for your body to use. It suits people with possible deficiency symptoms, such as fatigue, low energy or memory problems, or a diet or condition that raises their risk.
Fast at-home B12 test, near the median price for its group
Checks active B12 (holotranscobalamin), the form of vitamin B12 taken up and used by your cells, from an at-home sample. Suited to a quick, flexible check on B12 status, including for vegetarians and vegans, who are more at risk of low B12.
Flexible collection, price close to the group average
This blood test measures total vitamin B12, the standard marker for checking B12 status. It suits people who want a straightforward single-marker check rather than the added detail of active B12 or related markers.
Priced above the median for active B12 tests we track
A single-marker blood test measuring active vitamin B12, suited to people at risk of deficiency, including vegetarians and vegans.
