Vitamin B6
Vitamin B6 is a water-soluble B-vitamin involved in energy production, brain function, hormone regulation and the production of neurotransmitters such as serotonin and dopamine. It also plays a role in immune function and red blood cell formation.
Although B6 is essential for good health, it is one of the supplements most likely to cause problems when taken in high doses or for long periods. Excess vitamin B6 can irritate the nerves, leading to tingling, numbness or burning sensations — even at doses found in some “stress”, “PMS” or “energy” supplements.
Because B6 deficiency is uncommon and symptoms can overlap with many other conditions, this is not a supplement to take casually or based on guesswork. Most people can meet their needs through food, and supplementation should be guided by testing or practitioner advice.
What It Is
Vitamin B6 (also known as pyridoxine or P-5-P) is a B-vitamin involved in:
energy production
nervous system function
immune health
hormone balance
making neurotransmitters such as serotonin and dopamine
supporting the metabolism of protein and carbohydrates
It appears in supplements as:
Pyridoxine hydrochloride (common form)
P-5-P (pyridoxal-5-phosphate) — a more active form
Both forms can cause problems if too much is taken.
What It’s Used For
Vitamin B6 supplements are sometimes considered to support:
mood and emotional balance
energy levels
premenstrual symptoms
morning sickness (under medical guidance)
protein metabolism
general wellbeing during stress
However, many of these areas are influenced by multiple nutrients and lifestyle factors — not B6 alone.
Because high-dose B6 can cause nerve irritation, supplementation should only be used when there is a clear reason.
What the Evidence Says
Research shows that B6:
supports nervous system and brain function
contributes to psychological wellbeing
plays a role in hormone and neurotransmitter pathways
is involved in red blood cell formation
supports immune function
However, evidence also shows:
too much B6 can cause nerve problems, including tingling, numbness or burning sensations in hands or feet
B6 toxicity can happen at doses found in some high-street supplements
long-term use of high-dose B6 is the biggest risk factor for nerve symptoms
B6 deficiency is relatively uncommon in the UK
symptoms often attributed to “low B6” can have many other causes
This makes safe use extremely important.
When It Can Be Helpful
B6 may be helpful when:
a recent blood test shows low B6
there is low dietary intake of B6-rich foods
a practitioner has recommended a specific form or dose
hormone or neurotransmitter pathways have been reviewed as part of wider testing
pregnancy-related nausea is being managed under GP/midwife guidance
B6 should not be used simply because of tiredness, low mood or stress — these symptoms have many possible causes.
When Caution Is Needed
Vitamin B6 requires careful use because too much can affect the nerves.
Use caution — and seek guidance — if you:
take a multivitamin or energy supplement that already contains B6
use “PMS”, “stress”, “energy” or “hormone balance” blends (these often contain high doses)
notice tingling, numbness or burning sensations — signs that B6 may be too high
have a history of nerve issues
are pregnant (only specific doses are safe)
take medications processed by the liver (B6 can change how your body handles some medicines)
follow multiple supplement programmes at once
Why It’s Not Always the First Step
Because B6 deficiency is rare and symptoms are non-specific, it is not usually the best starting point for low energy, stress or mood concerns.
Before considering B6 supplements, it’s worth exploring:
overall protein intake (B6 works closely with protein metabolism)
meal timing and blood sugar balance
sleep quality
stress load and recovery
other B-vitamins (especially B12 and folate)
whether existing supplements already provide B6
Addressing these factors often reduces symptoms without needing supplementation.
Nutrition Support
You can support natural B6 intake by including foods such as:
chickpeas
bananas
potatoes
oats
poultry
tuna and salmon
sunflower seeds
whole grains
Supporting digestion and balanced meals also helps the body use B6 efficiently.
Food sources rarely cause problems because the body regulates B6 from food more effectively than from supplements.
If You’re Unsure Whether B6 Is Right for You
If you’re considering B6 for mood, energy, hormones or stress, we can look at your diet, symptoms and any recent blood tests to see whether it’s appropriate. Because high doses can affect the nerves, it’s important to approach B6 with clarity and guidance.
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