High Vitamin B6 on Your Blood Test
Why B6 builds up from supplements, how it can cause tingling and numbness, and what the TGA wants you to check on every label, in plain English.
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The Quick Answer
Vitamin B6 (also called pyridoxine) is measured in your blood as active B6, or pyridoxal-5-phosphate (P5P). The typical Australian adult reference range is roughly 20 to 121 nmol/L, though this varies between labs. A result above this range is almost always explained by supplements, not food, since it is very hard to reach a high level from diet alone.
In Australia, the Therapeutic Goods Administration (TGA) has specifically warned that vitamin B6 is present in many everyday products, magnesium tablets, general multivitamins, energy drinks and pre-workout powders, and that people often unknowingly combine several of these at once. Taken together over months or years, this can push B6 high enough to cause tingling, numbness or a burning feeling, usually in the feet. The single most useful thing you can do is check the ingredient label of every supplement and fortified drink you take.
What Is Vitamin B6 and Why Can Too Much Be a Problem?
Vitamin B6 is a water-soluble vitamin your body uses to build neurotransmitters, support red blood cell production and help metabolise protein. Because it is water-soluble, most people assume any excess is simply flushed out in urine, and to a large extent that is true for a normal diet.
The problem is dose and duration. Unlike most water-soluble vitamins, sustained high intake of B6, generally well above the roughly 1.3 to 1.7 mg per day an adult needs, can build up faster than it clears and become directly toxic to peripheral sensory nerves. This is unusual among vitamins: most people think of vitamin toxicity as a fat-soluble vitamin problem (vitamin A or D), but B6 is one of the few water-soluble exceptions.
The nerves most affected are the long sensory fibres running to your feet and hands, which is why symptoms typically start as tingling or numbness at the furthest points from your spinal cord first. This pattern is called a length-dependent sensory peripheral neuropathy, and it is the main reason clinicians take a high B6 result seriously even when someone feels otherwise well.
Causes of High Vitamin B6
The overwhelming majority of high B6 results trace back to supplements, and very often to more than one product taken at the same time, rather than a single obvious culprit.
Multivitamin and multi-mineral tablets
Many everyday multivitamins contain 25 to 100 mg of B6 per tablet, well above the 1.3 to 1.7 mg daily requirement. Taken alone this is usually harmless, but it adds up fast when combined with other products.
Magnesium supplements
B6 is often added to magnesium tablets because it is marketed as helping magnesium absorption. This is one of the main sources the TGA flagged, since people often do not realise their magnesium tablet also contains a significant dose of B6.
Energy drinks and energy shots
Many energy drinks add B vitamins, including B6, at doses well above daily requirements, often several times over. Drinking two or three cans a day can be a meaningful source of B6 that people rarely think of as a supplement.
Pre-workout and sports performance powders
Pre-workout blends frequently include high-dose B vitamins. Combined with a separate multivitamin, this can push daily B6 intake well past safe long-term levels.
Standalone B-complex or high-dose B6 tablets
Some B-complex products contain 50 mg or more of B6 per tablet, intended for short-term use. Taking these daily for months or years is the classic pattern behind B6-related nerve damage.
PMS, menopause or mood support formulations
B6 is included in many formulations marketed for premenstrual symptoms or menopause, sometimes at doses of 50 mg or higher, and is easy to overlook if taken alongside a general multivitamin.
Prescribed high-dose B6 for a medical condition
Occasionally a doctor prescribes higher-dose B6, for example for certain forms of nausea in pregnancy or specific metabolic conditions. This should always be taken exactly as directed and reviewed regularly.
Rare kidney or metabolic causes
Reduced kidney clearance of B6, or rare inherited metabolic conditions, can occasionally raise blood B6 without high supplement intake. Your GP will usually only consider this if supplement use has been ruled out.
Symptoms That Can Accompany High Vitamin B6
Many people with a mildly high B6 level feel completely well, and the result is picked up incidentally on a routine panel. Symptoms usually only appear after months of sustained high intake, and the nerve symptoms are the ones worth taking seriously.
Tingling or pins-and-needles in the feet
Usually the earliest symptom of B6-related nerve irritation. Often starts in both feet at the same time and can spread upward over weeks to months of continued high intake.
Numbness in the feet or hands
A reduced ability to feel light touch, temperature or vibration, usually in a stocking-and-glove pattern affecting both sides of the body evenly.
Burning pain in the feet
Some people describe a burning or electric-shock sensation rather than numbness. This can be worse at night and may be mistaken for other causes of nerve pain.
Unsteadiness or balance problems
Reduced sensation in the feet can make it harder to judge foot placement, particularly in low light or on uneven ground, increasing the risk of trips and falls.
Sensitivity to light (photosensitivity)
Skin reactions to sunlight have been reported with very high B6 intake, though this is less common than the nerve symptoms.
Nausea or reduced appetite
Non-specific digestive symptoms can occur with high B6 intake and often improve quickly once supplements are stopped.
Headache
Reported with high intake in some people, usually mild and non-specific, and not a reliable way to tell whether B6 is the cause on its own.
Skin changes or acne-like breakouts
Occasionally reported with sustained high B6 intake. Usually resolves once intake returns to normal levels.
Red Flags, When to See Your GP Promptly
Most people with a high B6 level and no symptoms can simply stop the relevant supplements and mention it at their next routine appointment. But some findings should prompt a call to your GP within a week or two:
Numbness or tingling spreading up the legs or arms
Suggests more advanced nerve involvement and should be reviewed by your GP promptly rather than waiting for a routine appointment.
Difficulty walking or a change in balance
Reduced sensation in the feet increases fall risk, particularly in older adults. Tell your GP if you have started stumbling or feeling unsteady.
Weakness as well as numbness
Muscle weakness alongside sensory symptoms points toward a broader nerve or spinal cord problem and needs prompt assessment to identify the cause.
Symptoms in only one limb, or only on one side
B6-related neuropathy typically affects both sides evenly. A one-sided pattern suggests a different cause, such as a trapped nerve or spinal issue, and should be assessed separately.
B6 level very high (above roughly 500 nmol/L)
Levels this high carry a meaningfully higher risk of nerve damage and warrant prompt review of every supplement you take, plus closer monitoring for symptoms.
Symptoms not improving weeks after stopping supplements
Most people improve within weeks to a few months. If there is no improvement, or symptoms are getting worse, further investigation is needed to make sure B6 was the correct explanation.
What Your GP Will Do Next, The Workup
Australian GPs follow a fairly practical pathway when investigating a high B6 result, focused mainly on finding the source rather than ordering lots of further tests.
Confirm the high result
A single high B6 result is usually repeated to confirm it was not a one-off, and to check whether it has been trending up. Your GP will also ask when you last took any supplements before the blood was drawn, since recent intake can temporarily raise the level.
List every supplement, drink and product you take
This is the single most useful step. Bring every bottle, sachet or packet, not just the ones you think of as vitamins, and check the ingredient panel of each for pyridoxine or vitamin B6. Many people are surprised to find it in three or four different products.
Ask about nerve symptoms specifically
Your GP will ask about tingling, numbness or burning in your feet and hands, and may test your sensation to light touch, vibration and reflexes at the ankles to check for early peripheral neuropathy.
Stop non-essential B6-containing products
Under your doctor's guidance, you will usually be advised to stop supplements that are not medically necessary, while keeping anything genuinely prescribed for a specific reason.
Rule out other causes of your symptoms
If you have nerve symptoms, your GP may also check vitamin B12, folate, fasting glucose or HbA1c, kidney function and thyroid function, since these are more common causes of tingling and numbness and can coexist with high B6.
Recheck B6 and symptoms after a few weeks
Blood levels usually fall within a few weeks of stopping supplements. Your GP will typically recheck your B6 level and ask whether nerve symptoms have started improving.
Refer to a neurologist if symptoms persist
If numbness or tingling continues despite normalising B6 levels, or if symptoms are severe or worsening, referral to a neurologist for nerve conduction studies may be recommended to look for other causes.
What Happens Once You Know the Cause
Stopping the source, under medical advice
For the great majority of people, treatment is simply identifying and stopping the non-essential B6-containing products, done with your doctor or pharmacist rather than on your own, particularly if you take a supplement for a specific medical reason. Do not stop a prescribed medication without checking first.
Monitoring your B6 level
Blood B6 typically falls back into the normal range within a few weeks of stopping supplements, since it is water-soluble and clears fairly quickly once intake drops. Your GP will usually recheck the level alongside asking about your symptoms.
Managing nerve symptoms
Tingling, numbness or burning usually starts improving over weeks to a few months once the B6 source is removed, though recovery can take longer if very high doses were taken for an extended period. Your GP may suggest simple measures for comfort in the meantime and will monitor your progress at follow-up visits.
Reading every label, going forward
Once your level has normalised, the most useful long-term habit is checking the ingredient panel of any new supplement, energy drink or sports product for pyridoxine or vitamin B6, so you do not unknowingly reintroduce the same combination.
Common Products and Typical B6 Doses
Doses vary a lot between brands, so these are general guides only. Always check the actual label of the specific product you use rather than relying on typical figures.
Standard daily multivitamin
Typical B6: 2 to 100 mgRanges hugely between brands. Some gentle formulations contain only a small amount; others, particularly energy or stress-support multivitamins, contain far more than the daily requirement.
Magnesium plus B6 combination tablet
Typical B6: 10 to 50 mgA very common pairing on pharmacy shelves. The B6 dose is easy to overlook because the product is bought and thought of as a magnesium supplement, not a B6 one.
Energy drink (single can)
Typical B6: 2 to 10 mgA single can rarely causes a problem, but regular daily use, especially alongside other supplements, contributes meaningfully to total intake.
Pre-workout powder (single scoop)
Typical B6: 5 to 50 mgDoses vary widely by brand. Products aimed at endurance or energy commonly sit at the higher end of this range.
Standalone B-complex tablet
Typical B6: 25 to 100 mgIntended for short courses in most cases. Long-term daily use at this dose, especially combined with other B6 sources, is the pattern most often linked to nerve symptoms.
PMS or menopause support formulation
Typical B6: 50 to 100 mgSome formulations use B6 specifically for mood or fluid-retention symptoms. Worth checking the label if taken alongside a general multivitamin.
Sources and reference ranges
Adult reference ranges on this page follow the AACB and RCPA harmonised reference intervals unless stated otherwise; the range printed on your own report always takes precedence because laboratories differ.
High Vitamin B6, Frequently Asked Questions
What does it mean if my vitamin B6 is high?
A high vitamin B6 (pyridoxine) result almost always means you are taking more B6 than your body needs, usually from supplements rather than food. The most common source is not a single high-dose B6 tablet, but several products taken together that each contain B6, such as a multivitamin, a magnesium supplement and an energy drink or sports supplement.
What is the normal range for vitamin B6 in Australia?
Australian pathology labs typically report active vitamin B6 (pyridoxal-5-phosphate, or P5P) with a normal adult range of roughly 20 to 121 nmol/L, though this varies by laboratory. Levels above this range are considered high, and levels above about 500 nmol/L are associated with a meaningfully higher risk of nerve symptoms.
Can too much vitamin B6 cause tingling and numbness?
Yes. Long-term high intake of vitamin B6 is one of the few vitamin excesses that can directly damage peripheral nerves, causing tingling, numbness or a burning feeling, usually starting in the feet and sometimes the hands. This is called sensory peripheral neuropathy and is the main reason the TGA has warned about B6 in supplements.
How much vitamin B6 is too much?
The recommended dietary intake for adults is only about 1.3 to 1.7 mg per day. Nerve symptoms have been reported with long-term intakes from around 50 mg per day, and risk rises further above 200 mg per day. Many multivitamins, magnesium supplements and energy drinks contain 25 to 100 mg per serve, so combining a few products can add up quickly without anyone intending to take a high dose.
Why did the TGA warn about vitamin B6 in supplements?
The Therapeutic Goods Administration reviewed reports of peripheral neuropathy linked to vitamin B6 supplements and found that many people were unknowingly taking B6 from several products at once, such as magnesium tablets, multivitamins and energy or sports drinks. As a result, labelling and dose rules for B6-containing products were tightened, and consumers were advised to check every label for pyridoxine or vitamin B6.
Will symptoms go away if I stop taking vitamin B6?
In most cases, yes. Blood B6 levels usually fall within a few weeks of stopping the supplements, and nerve symptoms typically start improving over weeks to months. Recovery can be slower or incomplete if very high doses were taken for a long time, so it is worth discussing any ongoing symptoms with your GP rather than assuming they will resolve on their own.
Which supplements commonly contain vitamin B6?
Multivitamins, standalone B-complex tablets, magnesium supplements (often combined with B6 to support absorption), pre-workout and sports performance powders, energy drinks and shots, and some menopause or PMS formulations all commonly contain vitamin B6. It is worth checking the ingredient list of every supplement and fortified drink you take, not just obvious vitamin tablets.
Should I stop all vitamin B6 immediately if my level is high?
Do not stop or change any supplement without talking to your GP or pharmacist first, especially if you take B6 for a medical reason. In most cases your doctor will advise stopping non-essential B6-containing products and rechecking your level and symptoms after a few weeks. This lets them confirm the level was actually high because of supplements, rather than a rarer underlying cause.
Related Reading
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This page provides general educational information about high vitamin B6 and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your GP or pharmacist before stopping or changing any supplement, and about any abnormal blood test result, they have access to your full medical history and can interpret your results in context. SmarterBlood does not provide medical care and is not affiliated with any supplement manufacturer, pathology lab or portal referenced on this page.