Vitamin B12 Holo-TC Test

Home test for vitamin B12 deficiency.

Note: Only credit card and invoicing are available as payment methods for this product. The accompanying manual is in German.


Delivery : 1–3 business days

Incl. VAT, excl. Shipping

In stock

The Test

Vitamin B12 Blood Test

Vitamin B12 is bound in the blood to special transport molecules known as transcobalamins. Only vitamin B12 that is bound in this way can actually be utilised by the body. The holo-transcobalamin test (holo-TC test) measures only this biologically available vitamin B12.

The conventional serum blood test for total vitamin B12, which is still performed in many doctors' offices, also measures vitamin B12 that is not biologically available at all and therefore does not allow absolutely reliable statements about the actual vitamin B12 supply.

The holo-TC test, howver, gives a good indication of B12 levels that can reliably indicate even an impending deficiency.


Comparison between holo-TC test and MMA urine test

  Holo-TC MMA Urine Test
Material Blood Urine
Accuracy Very high High
Value Directly bioavailable, circulating B12 Indirect adenosylcobalamin in mitochondria
Results Quantitative result shows total supply, no statement about real cellular activity Shows cellular activity of one of the active vitamin B12 forms, quantitative results only possible to a very limited extent
Clinically Recognised Yes Yes


Test for Vitamin B12 Supply

The holo-TC test is useful for determining the biologically available B12 supply and allows quantitative conclusions to be drawn about the state of the body's stores and the severity of any existing deficiency.

The holo-TC test reliably measures the vitamin B12 circulating in the blood, but does not allow any precise conclusions to be drawn about the cellular supply, which can be checked using the vitamin B12 urine test, for example. Optimal results can be achieved by combining both test methods.

How to Use

How our holo-TC test works: 

Individual drops of blood should be taken via a small, painless fingertip prick using the lancet enclosed. Once you have obtained the sample, place it in the sample tube provided and send it, along with the enclosed return envelope, to the partner laboratory. The costs of shipping to the laboratory (from within DE) are included in the price.

The result, which is generated after 5-7 days, will be made available online for download and also sent via email.


The test kit includes:

1 set of instructions
2 return cards with test ID for registration
1 disinfection wipe
2 alcohol swabs
1 fingertip plaster
2 lancets CE 0344
1 blood collection tube
1 transport tube
1 name label
1 mailing bag

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