Vitamins & minerals
Vitamin B6
LOINC 1219-7 · ng/mL
Ranges
Reference range: 5–50 ng/mL
What it is
Vitamin B6 is a B vitamin involved in metabolism, nerve function, and the making of hemoglobin and neurotransmitters.
Why it matters
It supports energy, the nervous system and healthy blood, and helps process the amino acid homocysteine.
What high values can mean
A higher value usually reflects supplements; very high long-term intake can affect the nerves.
What low values can mean
A lower value can affect the nerves, skin and mood and may follow poor intake or some conditions.
How to improve it
A varied diet usually provides enough; supplements correct a deficiency but should not be taken in very high doses long-term.
Food & lifestyle
Poultry, fish, potatoes, chickpeas and bananas are good sources of vitamin B6.
Preparing for the test
A blood test; fasting is not required — follow your lab's instructions.
When to talk to a doctor
Discuss a low or high B6 with a doctor, especially with tingling or numbness.
Related markers
Sources
- NIH Office of Dietary Supplements
- MedlinePlus (NIH)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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