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KnowYou+

Vitamin B12 Blood Test

At-home blood test

Prepaid tracked return · Processed by a CQC-regulated laboratory.

A simple at-home blood test to check your Vitamin B12 level, an important nutrient involved in energy, nerves and healthy red blood cells.

Want to know whether your Vitamin B12 level could be affecting how you feel?

The KnowYou+ Vitamin B12 Blood Test measures the amount of Vitamin B12 in your blood.

Vitamin B12 plays an important role in energy production, nerve function and the formation of healthy red blood cells. Low levels can sometimes be associated with tiredness, weakness, difficulty concentrating, or tingling and numbness.

Checking your B12 level may be particularly useful if you follow a vegan or vegetarian diet, are an older adult, take certain long-term medicines, or have a condition that may affect how well nutrients are absorbed.

Important: Symptoms associated with low Vitamin B12 can have many different causes. This test provides information about your Vitamin B12 level but does not diagnose Vitamin B12 deficiency or the cause of any symptoms.

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For adults who want to check their Vitamin B12 level, including those experiencing tiredness or other possible symptoms, following a plant-based diet, monitoring a previous result, or testing as part of clinician-led care.

This test measures 6 key hormones linked to menstrual cycle and reproductive health:

  • FSH — Follicle-Stimulating Hormone
  • LH — Luteinising Hormone
  • Prolactin
  • Testosterone
  • Oestradiol
  • Progesterone

Together, these provide a broader picture of hormone patterns and reproductive health.

Strict fasting is not required. Avoid a high-fat meal for at least 6 hours before collecting your sample and drink water as normal. If you take prescribed Vitamin B12 supplements, check with your prescriber before testing, as they may advise pausing them for 24 to 72 hours beforehand.

Collect your sample at home, return it using the prepaid packaging provided, and receive your laboratory result securely.

Everything you need to collect and return your sample, including collection materials, instructions and prepaid return packaging.