Vitamin B6 — What It Means in Your Blood Test
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This vitamin helps your body use protein for energy and make chemicals your brain and nerves need.
This Vitamin B6 result reflects how much of the nutrient is available in your blood right now. Keeping it in good supply helps you turn protein into fuel and keeps brain and nerve signals flowing.
Also known as: pyridoxine, pyridoxal-5-phosphate, P5P, PLP, pyridoxal phosphate
This isn't a case where higher or lower is better. Your body keeps it in a narrow band, and both directions can matter.
Last reviewed: 2026-08-16
What does Vitamin B6 do in your body?
This nutrient works behind hundreds of reactions that break down what you eat and pass messages between brain cells [Institute of Medicine, 1998]. A steady supply supports clear thinking, a calm mood, and healthy blood. The reading shows whether your amount sits in a comfortable range.
What is Vitamin B6?
Vitamin B6 is a vitamin that dissolves in water. It helps many body reactions, including how you use protein and how your nerves send signals. This test measures your level.
Why is Vitamin B6 tested?
Your doctor may order this test when looking into signs of too little or too much B6, or conditions that affect how you absorb nutrients.
What is a normal Vitamin B6 range?
- India
- No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison.
- Global
- Normal (as pyridoxal phosphate): 5–50 ng/mL (Institute of Medicine / NIH reference)
Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
Source: [Institute of Medicine, 1998]
What does your Vitamin B6 value mean?
There is no widely-accepted set of value bands for this parameter. Compare your result with the reference range printed on your own report, and discuss it with your doctor.
What does a high Vitamin B6 result mean?
A very high level, usually from high-dose supplements over time, is linked to nerve symptoms. These can include tingling or numbness worth discussing with your doctor.
What happens when your Vitamin B6 is high?
Taking very high amounts over a long time can build up around nerves. This can affect how they carry signals in the hands and feet [Institute of Medicine, 1998].
What does a low Vitamin B6 result mean?
A low level can cause skin changes, nerve symptoms, and a form of anaemia (low red blood cells).
What happens when your Vitamin B6 is low?
B6 helps run the reactions that build brain-signalling chemicals and red blood cells, so a shortfall makes both harder to sustain [Institute of Medicine, 1998].
Which foods are rich in Vitamin B6?
- In India
- whole grains, bananas, dals, and groundnuts (peanuts)ICMR-NIN (2017)
- Internationally
- poultry, fish, potatoes, and bananasUSDA FoodData Central (2024)
What can affect your Vitamin B6 result?
- Poultry, fish, and potatoes
- Age
- Kidney function
- Long-term heavy drinking
- Some immune or gut conditions
Questions to ask your doctor
About this result
- What does my Vitamin B6 result mean for me specifically, given my age and health?
- Is my Vitamin B6 in the range that is right for me, not just the lab's general range?
What to do next
- Could anything I eat, do, or take have affected my protein metabolism vitamin result?
- Is there anything I should do about my Vitamin B6, or is it fine to leave as it is?
About retesting
- Does my Vitamin B6 need to be repeated, and if so, when?
- The typical range for Vitamin B6 can vary between labs — should I compare my result against my own lab's printed range?
The bigger picture
- Should my Vitamin B6 be looked at together with my Vitamin D (25-OH) and Vitamin B12 result?
- Does my Vitamin B6 connect to any condition I already have, or to anything I have noticed in how I feel?
Frequently asked questions
- What is Vitamin B6?
- Vitamin B6 is a vitamin that dissolves in water. It helps many body reactions, including how you use protein and how your nerves send signals. This test measures your level. Your doctor may order this test when looking into signs of too little or too much B6, or conditions that affect how you absorb nutrients.
- What is a normal protein metabolism vitamin range?
- A typical adult range is around Normal (as pyridoxal phosphate): 5–50 ng/mL (Institute of Medicine / NIH reference). No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison. Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
- What does a high Vitamin B6 result mean?
- A very high level, usually from high-dose supplements over time, is linked to nerve symptoms. These can include tingling or numbness worth discussing with your doctor.
- What does a low Vitamin B6 result mean?
- A low level can cause skin changes, nerve symptoms, and a form of anaemia (low red blood cells).
- What can affect your Vitamin B6 result?
- Several everyday factors can influence it, including Poultry, fish, and potatoes, Age, Kidney function, Long-term heavy drinking, Some immune or gut conditions.
Sources
- Institute of Medicine (1998) — Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline
- ICMR-NIN (2017) — Indian Food Composition Tables (IFCT) Link
- USDA FoodData Central (2024) — USDA FoodData Central (National Nutrient Database) Link
Part of the Vitamins
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