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.
1 biomarker as listed by Medichecks.
Active B12 is the form of vitamin B12 that your body can actually use, and low levels have been linked to tiredness, low energy, muscle weakness and memory problems. This test checks that single marker, which suits anyone with possible deficiency symptoms, a diet low in B12-rich foods, or a condition such as Crohn's, coeliac disease or pernicious anaemia that affects absorption.
On price this is one of the strongest options in its comparison group: at £39 it matches London Medical Laboratory's test as the cheapest we track, and comes in well below the £46 group median, undercutting Blue Horizon Medicals, Randox Health, Forth and Better2Know's cheaper kit, as well as Bluecrest Wellness, by varying amounts.
It also scores at the top for collection convenience, since you can choose an at-home finger-prick, an in-store clinic visit, a home nurse visit or a venous draw, with results typically back in around 2 days. Trust signals and results and follow-up both score well too, reflecting the provider's Trustpilot record, lab accreditation, trading history and doctor review of every result.
This is a solid choice if you want a low-cost, fast check of active B12 on its own, for example if you have symptoms like fatigue or memory problems, follow a vegan or vegetarian diet, or have a condition that affects absorption. London Medical Laboratory offers an equivalent single-marker test at the same £39 price, so it is worth comparing collection options between the two if price is equal.
If you would rather check B12 alongside folate or ferritin in one go, look at a combined vitamin B12 and folate test instead, since this one measures active B12 only.
You can collect your sample with an at-home finger-prick kit, or arrange a venous blood draw at a clinic or through a home nurse visit. The lab tests the sample for active vitamin B12, a doctor reviews the result, and your report is typically ready in around 2 days.
At £39, this single-marker active B12 test is tied with London Medical Laboratory's £39 test as the cheapest in our comparison, and undercuts Blue Horizon Medicals, Randox, Forth, Better2Know and Bluecrest, some by a wide margin. It also offers full collection flexibility, including an at-home finger-prick, with results typically back in around 2 days.
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; a home nurse visit is offered; results in around 2 days, in line with or faster than similar tests.
Results are reviewed by a doctor; the provider does not describe the report format.
Trustpilot 4.5 from 2,477 reviews; accredited lab (UKAS ISO 15189 partner labs); doctor review as standard; trading 25+ years.
£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.
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.
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.
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.
