Single-biomarker blood testVitamin B6 (Pyridoxine) Blood Test
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Vitamin B6 (Pyridoxine) Blood Test

£119 ✓ In Stock

What's covered in the price: Laboratory-supplied test kit with sample collection materials and prepaid return packaging. Results turnaround varies by test — see the estimated turnaround time shown above.
Results ready within 8 working days

Your sample goes to a UKAS accredited laboratory meeting ISO 15189 standards.

Date of birth required

After you receive your order confirmation email, please reply with your date of birth.

Blood sample
Clinic visit
(phlebotomy charges apply)
CQC registered Accredited UK labs ISO 15189

How it works

Your testing journey

From order to results in four simple steps. Full transparency on where each step happens and what it costs.

1
Medi Test Direct kit delivered by post

Receive your kit by post

Dispatched same working day if ordered before 3pm. Royal Mail Tracked delivery, typically 1–3 working days. 90% of kits arrive within 24 hours.

2
Clinic sample collection

Visit a partner clinic

Book a phlebotomy appointment at one of our 365+ UK partner clinics. Take your kit with you — the phlebotomist will collect your sample using the materials provided.

Phlebotomy fee applies (paid at clinic)
3
Venous blood draw at a clinic

Venous blood draw at a clinic

A trained phlebotomist takes a small blood sample from a vein in your arm using the vacutainers provided in your kit. The appointment takes around 10 minutes.

4
Return sample by prepaid envelope

Return by prepaid envelope

Seal your sample in the biohazard bag provided and drop it in any Royal Mail postbox using the prepaid Tracked 24 envelope. Post Monday–Thursday for best results.

Vitamin B6 (pyridoxine) is a water-soluble B vitamin essential for over 100 enzyme reactions in the body, primarily involving protein metabolism. It plays a crucial role in producing neurotransmitters such as serotonin, dopamine, and GABA—chemicals that regulate mood, sleep, and cognitive function. B6 is also vital for haemoglobin production, immune function, and maintaining healthy homocysteine levels (an amino acid linked to cardiovascular risk when elevated).

This test is particularly valuable if you experience persistent fatigue, mood disturbances including depression or irritability, peripheral neuropathy (numbness or tingling in hands and feet), skin problems such as dermatitis or cracked lips, or a weakened immune system with frequent infections. Those at increased risk include people taking certain medications (like isoniazid, penicillamine, or oral contraceptives), individuals with kidney disease, autoimmune conditions, or alcohol dependence, and those following restrictive diets.

What's covered in the price: You receive a venous blood collection kit and professional laboratory analysis. Because this test requires a venous blood draw, you'll need to arrange collection with a qualified phlebotomist—either at a clinic near you or through your own arrangements. A phlebotomy fee may apply separately. Your results will be ready within 8 working days.

Venous Blood Collection Kit

This kit is sent to you and taken to your chosen clinic. The phlebotomist will collect your sample using the materials provided.

  1. 1Vacutainer blood collection tubes
  2. 2Needle and butterfly needle
  3. 3Tourniquet
  4. 4Alcohol swab
  5. 5Cotton wool and gauze
  6. 6Adhesive plaster
  7. 7Biohazard specimen bag
  8. 8Prepaid return envelope (Royal Mail Tracked 24)
  9. 9Laboratory request form
  10. 10Instructions for the phlebotomist
Fasting: Please fast for 8–12 hours before your test, drinking only water. Take regular medications as prescribed unless advised otherwise by your doctor. Supplements: Stop taking vitamin B6 supplements or multivitamins for at least 24 hours prior to sampling to ensure accurate results. Medications: Some medications can affect B6 levels. Continue taking prescribed medications but inform your healthcare provider of all medications you're taking when reviewing results.

Vitamin B6 (pyridoxine) is a water-soluble vitamin essential for amino acid metabolism, neurotransmitter synthesis (including serotonin, dopamine, and GABA), haemoglobin production, and immune function. It exists in several forms, with pyridoxal 5'-phosphate (PLP) being the active coenzyme form measured in blood tests. B6 is involved in over 100 enzymatic reactions, primarily relating to protein metabolism, and helps regulate homocysteine levels—an amino acid associated with cardiovascular risk when elevated. Deficiency can cause microcytic anaemia, dermatitis with scaling on the lips and cracks at the corners of the mouth (cheilosis), glossitis (swollen tongue), depression, confusion, and peripheral neuropathy. Importantly, excess B6 from over-supplementation can also cause nerve damage (sensory neuropathy), making testing valuable to identify both deficiency and toxicity. Good dietary sources include poultry, fish, potatoes, chickpeas, bananas, and fortified cereals. Results outside the normal range may need a follow-up with your GP.

Medical Disclaimer

This test is for screening and information only — it is not a medical diagnosis or professional advice. Please have your results reviewed by a qualified doctor or healthcare provider who can explain what they mean for your personal health situation. If your results show anything outside the normal range, or if you're worried about your health, see your doctor as soon as you can. Don't change any medications or treatments based on these results alone — always talk to your healthcare provider first.

NO CLINICS, NO QUEUES, NO HASSLE

Four steps to clarity

Pick your panel 01

Pick your panel

Browse over 200 clinically designed test kits and choose the one that fits your goals.

Kit to your door 02

Kit to your door

Everything you need arrives in discreet packaging with step-by-step instructions inside.

Collect your sample 03

Collect your sample

Follow the simple instructions in your kit — whether it's a finger-prick at home or a venous draw at a partner clinic.

Insights delivered 04

Insights delivered

Clear, easy-to-understand results sent to you online with actionable health guidance.

Frequently asked questions

No. Vitamin levels are not significantly affected by recent food intake.

Vitamin B6 is essential for amino acid metabolism, neurotransmitter production, and immune function. Deficiency can cause peripheral neuropathy, anaemia, depression, and confusion. Both deficiency and excess (from high-dose supplementation) can cause nerve damage.

Yes. Long-term supplementation above 200mg/day can cause peripheral neuropathy (tingling, numbness in hands and feet). The UK recommended upper limit is 200mg/day from supplements. Testing confirms your level is in the safe range.

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