Written by Charles Gumbley, BHSc (Clinical Nutrition), DipHSc (Western Herbal Medicine)
Evidence checked: 20 July 2026
This article provides general nutrition education. It does not diagnose vitamin B6 deficiency or recommend a personal supplement dose. Stop a product containing B6 and seek medical advice promptly if you develop tingling, burning or numbness in your hands or feet. Speak with a doctor, pharmacist or Accredited Practising Dietitian before supplementing for pregnancy nausea, premenstrual symptoms, neuropathy or a diagnosed deficiency.
Conflict disclosure: Nutrition Market sells supplements. No product is ranked or linked in this guide. The adaptive feed is suppressed because the live stand-alone products have not passed current label, ARTG, dose, margin and clinical-placement gates.
Vitamin B6 is a family of six related compounds, including pyridoxine, pyridoxal and pyridoxamine and their phosphate forms. Pyridoxal 5-phosphate, usually shortened to PLP or P5P, is the main coenzyme form in human tissue. Vitamin B-6 is a water-soluble vitamin, but that does not make high-dose long-term use harmless.
The established benefits of vitamin B6 come from meeting nutritional requirements and correcting deficiency. PLP participates in amino-acid metabolism, glycogen breakdown, haemoglobin formation, immune function and neurotransmitter synthesis. These roles do not show that large doses improve mood, sleep, memory, cancer risk or cardiovascular outcomes in people who already get enough vitamin B6.
Key points
- Vitamin B6 helps more than 100 enzyme reactions, especially those involving protein and amino acids.
- Food sources of vitamin B6 include fish, poultry, meat, potatoes, legumes, nuts, fortified cereals and non-citrus fruit.
- Australian adult RDIs range from 1.3 to 1.7 mg per day, depending on age and sex.
- Deficiency can contribute to mouth and skin changes, anaemia, irritability, confusion and weakened immune function.
- Supplementary B6 can cause peripheral neuropathy; the TGA says there is no established minimum dose, duration, form or patient risk factor.
- Check every multivitamin, magnesium, zinc, iron, B-complex, energy drink and stand-alone product before adding the total intake.
What Vitamin B6 Does: Pyridoxine, PLP and Metabolism
The body converts different forms of vitamin B6 to PLP. This coenzyme helps enzymes transfer amino groups, release glucose from stored glycogen and make compounds needed for normal physiology. Vitamin B6 is involved in forming haemoglobin and in converting tryptophan through pathways that contribute to niacin and neurotransmitter production.
PLP-dependent reactions help make serotonin, dopamine, gamma-aminobutyric acid and other signalling molecules. This explains the biological role of vitamin B6 in the nervous system; it does not prove that taking vitamin B6 treats depression, anxiety or insomnia. A pathway is not the same as a clinical outcome.
Vitamin B6 also works alongside folic acid and vitamin B12 in homocysteine metabolism. Supplementation can lower homocysteine in some circumstances, but trials have not established a corresponding reduction in heart attacks or strokes. B6 and B12 should not be treated as interchangeable, and high folate intake can complicate recognition of vitamin B12 deficiency.
Food Sources of Vitamin B6 and How Much Vitamin B6 Is Needed
Sources of vitamin B6 include fish such as tuna and salmon, poultry, beef and organ meats. Potatoes and other starchy vegetables, chickpeas, nuts, bananas, fortified breakfast cereals and some non-citrus fruits also contribute. Vitamin B6 from a mixed diet is generally well absorbed, although plant foods can contain less available glucoside forms.
Australian RDIs for adults aged 19 to 50 are 1.3 mg per day for men and women. From age 51, the RDI is 1.7 mg for men and 1.5 mg for women. Pregnancy is 1.9 mg and breastfeeding is 2.0 mg per day. These are population references for intake of vitamin B6, not treatment doses. Amounts of vitamin B6 used medically are a separate decision.
Most healthy adults can get enough through their diet. Older people, those with a narrow diet or those with certain health conditions may need individual assessment. Fortified food and drinks can add to intake of vitamins, so label checking should include them as well as medicines.
Vitamin B6 Deficiency: Symptoms and Risk
Isolated deficiency is uncommon and often appears alongside low levels of other B vitamins. Possible symptoms include cracked lips or sores at the corners of the mouth, a swollen tongue, dermatitis, irritability or mood changes, confusion, anaemia and reduced immune function. Severe vitamin B-6 deficiency can cause neuropathy or, rarely, seizures, particularly in infants.
Numbness and tingling cannot distinguish low B6 from excessive supplementary B6. They can also arise from diabetes, vitamin B12 deficiency, thyroid disease, alcohol-related disease, nerve compression, medicines and many other conditions. Plasma vitamin B6 concentrations may help in context, but blood levels of vitamin B6 do not replace assessment of symptoms, exposure and other causes. Vitamin B6 status needs clinical interpretation.
Risk is higher with chronic kidney disease, malabsorption conditions, alcohol dependence, poor dietary intake and some autoimmune or genetic conditions. Isoniazid used for tuberculosis and some anti-seizure medicines can affect vitamin B6 metabolism. A clinician can assess the medicine, diet, symptoms and PLP or other tests rather than relying on a stand-alone result.
Health Benefits of Vitamin B6: Can It Reduce Symptoms?
The clearest benefit of supplementation is restoring adequate function in someone with inadequate intake. Beyond that setting, the effect of vitamin B6 supplementation is condition-specific and usually weaker than a list of biochemical roles suggests.
Observational studies link higher dietary vitamin B6 status with some health outcomes. Research on vitamin B6 and risk of colorectal cancer is an example: an association does not establish a cancer-risk reduction from a supplement. Randomised trials have not shown that B6 alone reduces cancer incidence or mortality. The phrase “vitamin B6 in cancer prevention” therefore describes a research question, not a supported retail claim.
For cognitive function and depressive symptoms, low status can accompany illness or poor nutrition, but systematic reviews of B-vitamin trials have not shown a consistent benefit in generally well-nourished older adults. The same distinction applies to cardiovascular disease: lowering homocysteine with folate and vitamin B-12 plus B6 has not reliably reduced clinical events.
Older studies suggest that vitamin B6 may reduce symptoms of premenstrual syndrome, but study quality was poor and the effective amount was uncertain. Evidence does not establish that vitamin B6 is effective for every person. More recent safety concerns make unsupervised high-dose use a poor response to PMS or PMDD.
Pyridoxine is used in clinician-guided care for nausea and vomiting in pregnancy, sometimes with doxylamine. This is different from routine high-dose supplementation in pregnancy. WHO does not recommend routine B6 supplementation to improve maternal and perinatal outcomes, while acknowledging possible nausea relief. A pregnant person with dehydration, weight loss, inability to keep fluids down, blood in vomit or severe symptoms needs prompt maternity care.
Taking Vitamin B6: Risk of Vitamin B6 Neuropathy and Safety
Australian supplements may contain pyridoxine hydrochloride, pyridoxal 5-phosphate or pyridoxal 5-phosphate monohydrate. Absorption does not differ enough to assume that an “activated” form offers protection from toxicity. TGA advice applies across supplementary forms, and multiple products can create large combined amounts without the user realising it. Taking a vitamin B6 supplement should begin with a whole-label audit.
The current published Australian adult upper level for pyridoxine is 50 mg per day. That NRV is under review in 2026 and is not a target or a guarantee that lower intake is safe for every person. High doses of vitamin B6 increase concern, but the TGA reports no established minimum dose or duration at which neuropathy can occur. Products providing more than 10 mg of vitamin B6 per day require a peripheral-neuropathy warning.
In March 2026, the TGA advised that most people already get enough from food and that high or combined supplementary intake increases nerve risk. Stronger Australian scheduling controls for products above 50 mg are due to begin on 1 June 2027. Until then, a legally available product should not be interpreted as suitable for long-term self-treatment.
Peripheral neuropathy is commonly described as tingling, burning or numbness, usually in the hands or feet. Continued exposure after symptoms begin can allow damage to progress and may lead to lasting impairment. Stop all suspect B6-containing products and seek medical advice as soon as possible. Bring every vitamin B6 supplement label or photograph so the total daily amount can be calculated.
Taking vitamin B6 supplements also warrants medicine review. Interactions or altered requirements can occur with isoniazid, cycloserine, some anti-seizure medicines and levodopa when it is used without carbidopa. Pregnancy, breastfeeding, childhood use, kidney or liver disease and existing neuropathy require individual oversight rather than a generic dose.
Benefits of Vitamin B6 Questions
What happens if you take vitamin B6 every day?
Dietary B6 is needed every day, but a daily supplement may be unnecessary. Risk depends on total amount, duration and individual susceptibility. Check all products, stop if tingling, burning or numbness develops, and do not use the current 50 mg upper level as a target.
What does vitamin B6 help you with?
Vitamin B6 helps enzymes involved in amino-acid and glycogen metabolism, haemoglobin, immune function and neurotransmitter production. A supplement can correct inadequate intake. These roles do not establish a general treatment for low mood, heart disease, cancer, poor memory or insomnia.
What are the symptoms of B6 deficiency?
Possible symptoms include cracked lips or mouth sores, a swollen tongue, dermatitis, irritability, confusion, anaemia and weakened immunity. Severe deficiency can affect nerves. Because excess B6 can also cause neurological symptoms, assessment should come before supplementation.
Does vitamin B6 help with sleep?
Vitamin B6 participates in neurotransmitter pathways relevant to sleep biology, but a stand-alone B6 supplement has not been shown to improve insomnia or sleep in B6-replete adults. Sleep apnoea, medicines, mood, pain, alcohol, caffeine and sleep schedule are more useful starting points for persistent problems.
Vitamin B6 References
- National Health and Medical Research Council. Nutrient Reference Values: Vitamin B6. Accessed 20 July 2026.
- Therapeutic Goods Administration. Are you unknowingly taking too much vitamin B6?. Published 4 March 2026; accessed 20 July 2026.
- Therapeutic Goods Administration. Peripheral neuropathy with supplementary vitamin B6. Updated 25 February 2026; accessed 20 July 2026.
- Healthdirect Australia. Vitamin B deficiency. Reviewed February 2026; accessed 20 July 2026.
- National Institutes of Health Office of Dietary Supplements. Vitamin B6: fact sheet for health professionals. Updated 16 June 2023; accessed 20 July 2026.
- Muhamad R, et al. The role of vitamin B6 in peripheral neuropathy: a systematic review. Nutrients. 2023;15(13):2823. doi:10.3390/nu15132823.
- EFSA Panel on Nutrition, Novel Foods and Food Allergens. Scientific opinion on the tolerable upper intake level for vitamin B6. EFSA Journal. 2023;21(5):8006. doi:10.2903/j.efsa.2023.8006.
- World Health Organisation. Vitamin B6 supplementation during pregnancy. Updated 9 August 2023; accessed 20 July 2026.
Charles Gumbley founded Nutrition Market to make evidence-informed supplement guidance more accessible. He writes about supplement evidence and product selection for Nutrition Market. Site content is educational and not individual clinical advice.
