Vitamin B6, also known as pyridoxine, is one of the harder-working members of the B-vitamin family. It takes part in more than a hundred enzyme reactions, quietly supporting the nervous system, the way you process food into energy, and the production of healthy red blood cells. Like most B vitamins, it is water-soluble, so the body does not store large reserves and relies on a regular dietary supply.
What vitamin B6 does
B6 is a busy helper behind the scenes. Its main roles include:
- Protein and energy metabolism — helping break down and use the protein, fats and carbohydrates in your food.
- Nervous system support — contributing to the production of chemical messengers involved in mood and nerve signalling.
- Red blood cell formation — supporting the production of haemoglobin, which carries oxygen around the body.
- Immune function — playing a part in a healthy immune response.
Signs of too little B6
Deficiency of B6 is relatively uncommon on a varied diet, but when it happens the effects tend to reflect its roles in nerves and blood. These can include tiredness, low mood or irritability, a sore or cracked mouth, skin rashes, and in more established cases tingling or numbness in the hands and feet. Because these overlap with many other conditions, they are pointers rather than proof.
Why too much can be a problem too
B6 is unusual among the water-soluble vitamins in that taking very high doses from supplements over a long period can cause harm, most notably nerve-related symptoms such as tingling or numbness. This is one of the more useful reasons to test: if you take B6-containing supplements and develop nerve symptoms, a blood level can help clarify whether B6 is involved.
When a test is worthwhile
Testing vitamin B6 is not something everyone needs, but it can be genuinely useful in certain situations, including:
- Taking B6 or high-strength B-complex supplements over a long period
- Unexplained tingling, numbness or nerve symptoms
- A restricted diet or a condition that affects absorption
- Investigating tiredness or anaemia alongside other B vitamins
Making sense of the result
A blood test measures your vitamin B6 level, which is then interpreted alongside your symptoms, diet and any supplements you take. If a level is low or high, your clinician can help you understand what it means and what, if anything, to do about it. As with any nutrient, the aim is a level that sits comfortably within the healthy range rather than chasing a number for its own sake.
Check your vitamin B6
Book online with OneMedicine — CQC-registered clinic in Birmingham, or a home visit / local clinic nationwide. Doctor-reviewed results, most within 24 hours.
Book now
Specialist interest: Cardiovascular Medicine · OneMedicine, CQC-registered clinic