The table further down groups those foods by type and by how much they carry relative to each other. The sections after it explain why two people eating similar meals can land in different places on the same blood test, and what a result is worth discussing with a clinician.
Vitamin B6 is the group name for pyridoxine, pyridoxal and pyridoxamine, forms the body converts into pyridoxal 5'-phosphate, the active coenzyme behind much of amino acid metabolism, haemoglobin production and neurotransmitter synthesis. It is checked from a standard blood draw, and most laboratories report plasma pyridoxal 5'-phosphate, which biomarker reviews describe as the most widely used direct measure of status 1. A typical lab reference range runs from 5 to 50 ng/mL. FitScript's optimal range is narrower, 10 to 30 ng/mL, an optimization target rather than a diagnostic cut-off. Reference ranges vary by lab, age and sex, so read the range printed on your own report. The biomarker page linked above carries the full definition, the testing detail and what each part of the range reflects.
Vitamin B6 is spread widely across the food supply, but it concentrates in protein rich animal foods, starchy vegetables, legumes, seeds and fortified grains. The table below groups the main sources by food type and ranks them against each other, not against any daily target.
| Food group | Examples | Relative vitamin B6 content |
|---|---|---|
| Poultry | Chicken, turkey | High |
| Fish | Tuna, salmon, trout, mackerel | High |
| Organ meat | Liver | High |
| Other meat | Pork, beef | High |
| Starchy vegetables | Potatoes with skin, sweet potatoes, winter squash | High |
| Fortified grains | Fortified breakfast cereal, fortified flour products | High, varies by product |
| Legumes | Chickpeas, lentils, soybeans, kidney beans | Moderate to high |
| Nuts and seeds | Pistachios, sunflower seeds | Moderate to high |
| Fruit | Bananas, avocado, dried plums | Moderate |
| Other vegetables | Spinach, bell peppers, dark leafy greens | Moderate |
| Dairy and eggs | Milk, cheese, eggs | Moderate |
Relative content compares these foods with one another. It does not describe what a single serving delivers, because that depends on portion size, cut, cooking method and, for fortified products, on what the manufacturer added. Fortified breakfast cereal is the most variable row in the table, since fortification levels differ widely between brands and between countries. The practical read is simple. A diet that regularly includes poultry or fish, potatoes or other starchy vegetables, legumes and some seeds covers vitamin B6 from several directions at once, which is more reliable than leaning on any single food.
Poultry, fish, pork, beef and liver sit at the top of the animal side because vitamin B6 travels with protein and with muscle tissue. In the body, a large share of total vitamin B6 is held in skeletal muscle, bound to the enzyme glycogen phosphorylase, so the muscle meat of other animals is naturally a concentrated source. Liver ranks high for a different reason, since it is the organ that processes and stores much of the vitamin in the first place.
In animal foods, vitamin B6 occurs mainly as pyridoxal and pyridoxamine and their phosphorylated forms, attached to proteins. Digestion releases them, and intestinal enzymes strip the phosphate group before absorption. Oily fish such as salmon, trout, tuna and mackerel are worth noting because they carry vitamin B6 alongside other nutrients that often get attention on a blood panel, so a single food choice moves more than one marker over time.
Eggs and dairy contain vitamin B6, but in smaller relative amounts than meat and fish. A pattern built mostly on eggs and milk will supply some, though usually less than one built on poultry, fish or legumes. None of this is a recommendation about what to eat. It is a description of where the vitamin sits in the food supply, and a clinician or qualified nutrition professional is the person to talk to about changing a diet.
Potatoes, chickpeas, lentils, soybeans, pistachios, sunflower seeds, bananas, avocado and fortified cereal are the strongest plant sources. Potatoes deserve their reputation here, especially when the skin is eaten, and they contribute a meaningful share of vitamin B6 intake in populations where they are a staple. Chickpeas are the standout legume, and they come with fibre and plant protein attached.
There is a biochemical catch on the plant side. Plant foods carry vitamin B6 largely as pyridoxine, and a portion of it occurs as a glucoside bound form that the gut absorbs less efficiently than the free forms found in animal tissue. That does not make plant sources poor sources. It means a diet drawing vitamin B6 mostly from plants is working with a slightly less available pool, which matters more at the margins than in the middle of the range.
Fortified breakfast cereal behaves differently again. The vitamin B6 added during fortification is usually free pyridoxine, which is well absorbed, and it is one reason fortified grains appear high in the table despite grains being modest sources in their unrefined state. Bananas and avocado are reliable moderate contributors rather than leaders, which surprises people who know bananas mainly as a B6 food.
Yes, processing and heat reduce the vitamin B6 a food delivers, sometimes substantially. Vitamin B6 is water soluble and sensitive to heat and to light, so prolonged boiling, high heat cooking and long storage under bright light all cost some of it. Boiling leaches part of the vitamin into the cooking water, which is lost unless the liquid is used.
Milling matters for grains. Refining wheat removes the germ and the outer layers, where most of the vitamin B6 sits, which is why fortified flour and fortified cereal exist and why refined grain products that are not fortified contribute very little. Canning involves heat and time, so canned foods generally carry less than their fresh equivalents, although canned legumes remain a useful source.
None of this means cooked food is empty. Gentler methods such as steaming, roasting with the skin on, or cooking in liquid that is then consumed preserve more of the vitamin than a long boil that is drained away. The point for anyone reading a lab result is that two diets with identical ingredient lists can supply different amounts of vitamin B6 depending on how the food was handled before it was eaten.
Most of it, but not all, and the share varies with the form of the vitamin and the state of the gut. Phosphorylated forms are dephosphorylated by enzymes at the intestinal surface, absorbed in the small intestine, then carried to the liver, where they are converted into pyridoxal 5'-phosphate and released into circulation bound to albumin. That is the value a laboratory measures.
Research suggests that plasma pyridoxal 5'-phosphate reflects dietary vitamin B6 intake closely enough for population intake reference values to be anchored to it 2. That relationship is what makes food relevant to a blood result at all. It also explains why the relationship is not perfect, since every step between the plate and the plasma can shift the outcome.
Conditions that reduce absorption across the small intestine, such as in people with coeliac disease or inflammatory bowel disease, and anatomical changes after some gastrointestinal surgery, lower the share that gets through. Liver function matters too, because conversion to the active coenzyme happens there. Protein intake is relevant in the other direction, since vitamin B6 requirement rises alongside the amount of protein the body is processing.
Often, but not always, and a flat result after a diet change is not proof that the change did nothing. Plasma pyridoxal 5'-phosphate responds to intake, and it also responds to several things that have nothing to do with food. Research suggests that plasma pyridoxal 5'-phosphate falls when inflammation rises, which is one reason a low reading does not automatically point at the dinner plate 3.
Alcohol intake, pregnancy, kidney function and age all influence where a value lands. Timing matters as well, since a level drawn shortly after a large protein meal or after a period of unusual eating reflects a moment rather than a habit. This is why a single value is read as an observation rather than a verdict.
The useful sequence is observation, then meaning, then next step. The observation is the number and the range it sits in. The possible meanings include intake, absorption, inflammation and the demands the body is placing on the vitamin. The next step is a conversation with a clinician, who can decide whether the result warrants repeat testing, a look at related markers, or nothing at all beyond a note for next time.
Sometimes, but low intake is only one item on a longer list. Overviews of vitamin B6 status describe inadequate intake, impaired intestinal absorption, alcohol use, pregnancy, older age and kidney disease among the circumstances in which status falls 4. Some medicines also affect vitamin B6 status, and your prescriber is the person to ask about anything you are taking.
A suboptimal result therefore raises a question rather than answering one. Someone eating chicken, potatoes and chickpeas several times a week and still reading low is telling a different story from someone whose diet rarely includes any of the foods in the table above. The first picture points toward absorption, demand or inflammation. The second points toward intake.
A level above the standard range is a separate conversation. High plasma values in people who eat ordinary food are uncommon, because food amounts are modest and the vitamin is water soluble. Supplementation is the usual explanation, and whether any supplement is appropriate is a decision for a licensed provider, not something to settle from a web page. Never ignore a result outside the standard range. Bring the actual report to the person who ordered it.
Low status tends to produce vague, non-specific changes long before anything dramatic appears, which is exactly why it is easy to miss. Overviews of vitamin B6 deficiency describe skin changes around the nose and mouth, a sore or inflamed tongue, cracked lips, irritability or low mood, confusion, and in more marked deficiency a microcytic anaemia and peripheral nerve symptoms 4.
Every item on that list has many other explanations. Cracked lips happen for ordinary reasons. Low mood has a long differential. A single symptom paired with a single lab value is not a diagnosis, and no one should read one here. What the combination does provide is a reason to look, and to look at related markers rather than at vitamin B6 alone.
The practical framing is that symptoms raise the question and the lab value helps answer part of it. If symptoms are marked, persistent, or involve numbness, tingling or weakness, that is worth discussing with a clinician promptly rather than waiting for the next scheduled panel.
Because both change how a vitamin B6 value should be read, and both sit on pathways the vitamin runs. Low plasma pyridoxal 5'-phosphate is associated with markers of inflammation in cardiovascular disease, which means an inflamed state can pull the number down without intake having changed at all 3.
On the homocysteine side, vitamin B6 is a coenzyme for the transsulfuration pathway, the route that converts homocysteine into cysteine. Studies indicate that vitamin B6 status and the cellular availability of pyridoxal 5'-phosphate govern the canonical reactions of that pathway, along with side reactions that generate hydrogen sulfide 5. That is why homocysteine is sometimes used as a functional check on whether the vitamin is doing its job, rather than simply how much of it is in the blood.
For a reader looking at a panel, the takeaway is interpretive. A vitamin B6 value read next to an inflammatory marker and a homocysteine value tells a fuller story than the same number read alone, and it changes what a clinician does next.
In a large population based cohort of more than one hundred thousand participants, higher dietary intake of vitamin B6 was associated with lower risk of cardiovascular outcomes 6.
That is a statement about groups of people over time, not a promise about any individual, and it says nothing about supplements. It sits alongside the inflammation picture described above, where low plasma pyridoxal 5'-phosphate is associated with inflammatory markers in cardiovascular disease 3. Both threads point at the same practical conclusion. Vitamin B6 is worth having in adequate supply from food, and it is worth measuring rather than assuming.
What it does not support is treating any single nutrient as a lever for heart risk. Cardiovascular risk is assembled from blood pressure, lipids, glucose handling, inflammation, sleep, activity and family history, and a clinician weighs all of it together. Vitamin B6 is one input among many.
Older adults are one of the groups where status deserves closer attention, for reasons that stack. Research suggests that low vitamin B6 status is associated with sarcopenia, frailty and mortality in older adults 7. Appetite, protein intake, medication use and absorption all tend to shift with age, and each of them can reduce how much of the vitamin arrives and stays.
The food implication is straightforward without becoming a prescription. The foods in the table that lead on vitamin B6 are also, for the most part, protein rich foods, so an eating pattern that drifts away from poultry, fish, meat and legumes tends to drift away from vitamin B6 at the same time. That overlap is one reason a low value in an older adult is worth a careful look at what the day actually contains.
Age also changes how a result should be interpreted rather than just what it is. A value in the lower part of the standard range carries different weight in a person reporting fatigue and reduced strength than in a person with no symptoms at all. That judgement belongs to a clinician who can see the whole picture.
They overlap on the animal side and diverge completely on the plant side. Vitamin B12 occurs naturally only in animal foods and in fortified products, which is why intake falls sharply on a fully plant based diet without fortification. Vitamin B6 is distributed across both animal and plant foods, so potatoes, chickpeas, bananas, pistachios and fortified cereal can carry a plant based pattern a long way.
The two vitamins are also absorbed differently. Vitamin B12 absorption depends on stomach acid and on intrinsic factor, a protein produced in the stomach, so it is vulnerable to anything that changes the gastric environment. Vitamin B6 absorption depends mainly on intestinal enzymes and the small intestine surface. Different bottlenecks, different risk groups.
On a blood panel they behave differently too. Serum vitamin B12 is commonly paired with methylmalonic acid as a functional check, while vitamin B6 is most often read as plasma pyridoxal 5'-phosphate and cross-checked against homocysteine. Both feed into homocysteine metabolism from different directions, which is why panels frequently carry them together.
Homocysteine, vitamin B12, folate, a marker of inflammation and a basic metabolic and liver picture round out a vitamin B6 result. Homocysteine is the functional partner, since it reflects whether the pathways the vitamin supports are moving. Vitamin B12 and folate feed the same metabolism, and a low value in one often sits beside a low value in another, because the dietary and absorption patterns that cause them overlap.
Biomarker reviews also describe functional measures of vitamin B6 status beyond the plasma value, including erythrocyte transaminase activation coefficients and the PAr index 1. These are not on every routine panel, but they explain why clinicians sometimes look at enzyme behaviour rather than only at concentration.
An inflammatory marker belongs in the set for the reason already covered, that inflammation can lower the plasma value independently of intake. Liver enzymes matter because conversion to the active coenzyme happens in the liver, and kidney markers matter because clearance changes the picture. FitScript tests 150+ biomarkers per year and Atlas, its AI health advisor, reads each result against the markers around it rather than in isolation.
Any result outside the standard range is worth raising, and so is a result inside the range that sits beside symptoms that have not resolved. That includes persistent fatigue, mood changes, a sore tongue or cracked lips, or numbness and tingling in the hands or feet. Symptoms involving nerve sensation, weakness, or confusion are worth discussing with a clinician promptly rather than at the next routine visit.
Bring the printed report, including the range your laboratory used, since a value interpreted against the wrong range leads nowhere useful. Mention any medicines you take, since some medicines affect vitamin B6 status and your prescriber can tell you whether yours is one of them. Mention alcohol intake, recent gastrointestinal surgery, pregnancy and any digestive condition, because each changes how the number is read.
This page is educational and is not medical advice. Discuss your own results, and any treatment or next step, with a clinician or licensed provider who can see your full history, and remember that treatment decisions belong to a licensed provider.
For a side by side look at how these two B vitamins differ in food sources, absorption and the markers that track them, see b6 vs b12.
Poultry, fish, organ meat, pork, potatoes and other starchy vegetables, chickpeas and other legumes, pistachios, sunflower seeds, bananas and fortified breakfast cereal are the leading sources. Animal foods and fortified grains tend to carry the most readily absorbed forms. A varied pattern that includes several of these groups is more reliable than relying on one food.
It can, because vitamin B6 is present in potatoes, legumes, seeds, bananas, avocado and fortified grains, unlike vitamin B12 which occurs naturally only in animal foods. One difference is that part of the vitamin B6 in plant foods is in a bound form the gut absorbs less efficiently. A blood test is the way to see where a given person actually sits.
Some of it, yes. Vitamin B6 is water soluble and sensitive to heat and light, so long boiling, canning and extended storage reduce what a food delivers, and milling removes most of it from refined grains. Methods that use less water and less time, or that keep the cooking liquid, preserve more.
No. They are separate vitamins with different food sources, different absorption routes and different blood tests. Vitamin B6 is measured mainly as plasma pyridoxal 5'-phosphate, while vitamin B12 is usually measured as serum B12 and often paired with methylmalonic acid. They are frequently tested together because both feed into the same area of metabolism.
It is measured from a standard blood draw, and most laboratories report plasma pyridoxal 5'-phosphate. A typical lab reference range runs from 5 to 50 ng/mL, though the exact range varies by laboratory, age and sex. Always read your own result against the range printed on your report.
Very high intakes come from supplement products rather than from meals, because the amounts in ordinary food are modest and the vitamin is water soluble. A value above the standard range is usually explained by something other than the diet. Whether any supplement is appropriate is a decision for a licensed provider who has reviewed you.
Not necessarily. Intake is one possible explanation, and absorption, alcohol use, pregnancy, age, kidney function, inflammation and some medicines can all lower a value too. Ask your prescriber about anything you take, and bring the full report to the clinician who ordered the test so the result can be read in context.
Do not make a change on your own account for the sake of a test, because the point is to capture your usual pattern. Follow whatever preparation instructions the laboratory gives, and ask the clinician ordering the test whether anything you take should be paused beforehand. That decision belongs to the person ordering the test.