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.
1 biomarker as listed by Better2Know.
This test measures vitamin B12, a nutrient your body needs to keep blood and nerve cells healthy and to help process the energy from food. A shortage can build up gradually and cause tiredness, mouth soreness or memory problems, so people who are vegan, drink heavily, are over 50 or have digestive conditions that affect absorption are the most common reason to check it.
Within the vitamin B12 comparison group we track, Better2Know's clinic version is the most expensive of the peers we list by some distance: £170 against prices between £39 and £55 for the identical single marker, including Better2Know's own home finger-prick kit at £55. The clinic option adds a supervised blood draw, which some people prefer, but it does not change what is actually measured.
The scores reflect this trade-off. It does well for clarity, because the listing sets out the sample type, collection options and turnaround clearly, and for clinical depth, because a single-marker test does exactly what it claims to measure. It scores poorly on price given the size of the gap to the rest of the group, and only moderately on results and follow-up because the report is not reviewed by a doctor as standard.
This suits someone who wants a supervised clinic blood draw for a B12 check, or who is already visiting Better2Know for another test and wants to add B12 to the same appointment.
If price is the main concern, Better2Know's own £55 home finger-prick kit measures the same single marker for a fraction of the cost, as do equivalent tests from Medichecks and London Medical Laboratory at £39.
You provide a venous blood sample, taken from your arm at a clinic of your choice, or a nurse can visit you at home; Better2Know also sells a separate £55 finger-prick home kit for this marker. The sample is sent to the provider's laboratory for analysis, and results are typically available within about a day of the lab receiving it, viewable through Better2Know's online patient area. The provider does not state that results are reviewed by a doctor as standard, though a consultation can be arranged afterwards.
Better2Know's clinic B12 test costs £170 and gives you a single blood marker with results in about a day. That is far above the roughly £39-55 charged by peers such as Medichecks and London Medical Laboratory for the same marker, and results are not reviewed by a doctor as standard. If cost matters more than a clinic visit, a cheaper single-marker test, including Better2Know's own £55 home kit, will get you the same reading.
The listing publishes a detailed 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 blood sample taken at home by a visiting nurse or phlebotomist; with a venous or clinic option as well; a home nurse visit is offered; results in around 1 days, well ahead of the vitamins norm of 3.5.
Results are not doctor-reviewed and no consultation is included; the provider does not describe the report format.
Trustpilot 4.2 from 775 reviews; CQC registered; trading 18+ years.
£170.00 against a comparison-group median of £46.00 (+270%).
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.
Joint-cheapest B12 test in its comparison group
A single-marker blood test measuring vitamin B12, useful for checking deficiency risk, particularly on a plant-based diet.
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.
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.
Joint-cheapest B12 test in its comparison group
A single-marker blood test measuring vitamin B12, useful for checking deficiency risk, particularly on a plant-based diet.
