vitaminNot FDA-approvedOTC supplementAvailable over the counter in the US as a dietary supplementHigh-dose, long-term use (commonly cited above 200 mg/day) has been associated with peripheral neuropathy in case reports
Vitamin B6Benefits, Dosage & Interactions
Also known as: pyridoxine
Vitamin B6 is a water-soluble vitamin that is naturally present in many foods, added to others, and available as a dietary supplement. It serves as a coenzyme for more than 100 enzymes involved in metabolism, primarily protein metabolism, but also carbohydrate and fat metabolism.
Researched by DoseRoutine R&D TeamReviewed for accuracy by Nicholas Alexander, RSELast updated
Evidence: Strong — 1 human randomized trial published.
Evidence strengthStrong · 4/4
PreclinicalStrong human evidence
1 human randomized trial published.
Whole-body biological half-life
Not applicable
Typical timing
morning
Default unit
mg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
- Reported amounts
- Magnesium-vitamin B6 combination trial used 24 mg/day of vitamin B6 alongside magnesium; the Cochrane review of pregnancy trials covered doses from roughly 2.6 mg to 20 mg/day[1][2]
Reported for Vitamin B6 in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Vitamin B6 entry is written from. Each number matches an inline marker above.
- [1]Superiority of magnesium and vitamin B6 over magnesium alone on severe stress in healthy adults with low magnesemia: A randomized, single-blind clinical trialPouteau E, Kabir-Ahmadi M, Noah L, et al. · PLoS ONE · 2018 · Peer-reviewed · PMID 30562392
- [2]Pyridoxine (vitamin B6) supplementation in pregnancyThaver D, Saeed MA, Bhutta ZA · Cochrane Database of Systematic Reviews · 2006 · Peer-reviewed · PMID 16625530
How to track Vitamin B6 doses
Tracking Vitamin B6 well takes four fields and a habit. Here is what to record so the log is still useful in three months.
- 1
Add the dose and unit
Log Vitamin B6 with its dose in mg so totals stay comparable over time — including days when you split the dose or skip it.
- 2
Set the time of day and food rule
Typical timing is morning. Reminders fire at that time and can export to your calendar.
- 3
Check it against the rest of the stack
Run Vitamin B6 through the interaction checker against everything else in the routine — supplements, peptides, hormones and prescriptions — before it becomes a daily habit.
- 4
Log adherence, not intentions
Mark each dose taken, skipped or delayed as it happens. Weeks of honest logs are what make an adherence rate or a trend line meaningful; retrospective guessing is not.
- 5
Review against outcomes
Review Vitamin B6 alongside your logged metrics and any relevant blood work every few weeks before changing the dose, so the change is a response to data rather than to a good or bad day.
What to log each time
- Dose in mg
- Time of day
- Taken / skipped / delayed
- Any side effects or notable changes
References & Evidence
Sources on this page that document Vitamin B6 dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is Vitamin B6 studied for?
Deficiency-driven — not a performance booster
Vitamins primarily help when you're actually low. Extra doses on top of normal levels rarely add strength, endurance, or fat loss, and some fat-soluble vitamins (A, D, E, K) can build up to harmful levels.
- Confirm a deficiency with bloodwork before supplementing long-term (e.g. 25(OH)D for vitamin D, B12/folate, ferritin, magnesium RBC).
- Talk to your doctor or a registered dietitian about the right dose for your labs, medications, and conditions — especially in pregnancy, kidney/liver disease, or while on blood thinners.
- Re-test every 3–6 months and stop or lower the dose once levels are in range.
Educational information only — not medical advice. See our AI & medical policy.
What is Vitamin B6?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Vitamin B6 is a water-soluble vitamin that is naturally present in many foods, added to others, and available as a dietary supplement. It serves as a coenzyme for more than 100 enzymes involved in metabolism, primarily protein metabolism, but also carbohydrate and fat metabolism. It also plays a role in cognitive development through the biosynthesis of neurotransmitters, and in the maintenance of normal homocysteine levels, a factor in cardiovascular health.
The term 'Vitamin B6' refers to six related compounds: pyridoxine (an alcohol), pyridoxal (an aldehyde), and pyridoxamine (a nitrogen-containing group), and their phosphorylated forms pyridoxine 5'-phosphate, pyridoxal 5'-phosphate (PLP), and pyridoxamine 5'-phosphate. PLP is the active form of the vitamin and is the coenzyme for many metabolic reactions. The body converts all other forms of Vitamin B6 into PLP.
Good dietary sources of Vitamin B6 include poultry, fish, organ meats like beef liver, potatoes, and non-citrus fruits. Fortified cereals also contribute to dietary intake. Deficiency is uncommon in healthy individuals but can occur in those with impaired renal function, autoimmune diseases, chronic alcohol dependence, or malabsorption syndromes (NIH ODS).
What does the research say about Vitamin B6?
Tap a section to expand.
Vitamin B6, primarily in its active coenzyme form pyridoxal 5'-phosphate (PLP), participates in a wide array of biochemical reactions. Its main function is as a coenzyme in the metabolism of amino acids, carbohydrates, and lipids.
Key enzymatic reactions involving PLP include:
* **Amino Acid Metabolism:** PLP is critical for transamination, decarboxylation, racemization, and elimination reactions involving amino acids. For instance, it's involved in the synthesis of neurotransmitters like serotonin from tryptophan, dopamine from L-DOPA, and gamma-aminobutyric acid (GABA) from glutamate. It also plays a role in the conversion of homocysteine to cysteine, which is vital for maintaining healthy homocysteine levels.
* **Carbohydrate Metabolism:** PLP acts as a coenzyme for glycogen phosphorylase, an enzyme necessary for glycogenolysis (the breakdown of glycogen into glucose). This contributes to maintaining blood glucose levels.
* **Heme Synthesis:** PLP is a coenzyme for delta-aminolevulinic acid synthase, an enzyme involved in the synthesis of heme, a component of hemoglobin in red blood cells.
* **Lipid Metabolism:** It contributes to sphingolipid biosynthesis, which is crucial for nerve cell membranes.
Beyond its enzymatic roles, PLP is also involved in gene expression. It influences corticosteroid hormone action by binding to the steroid hormone receptor, thereby modulating gene transcription (PubChem). These diverse roles underscore Vitamin B6's importance in numerous physiological processes.
Source for this section: Sources for How does Vitamin B6 work?: Jumps to this entry in the sources and references list at the end of the page.
Vitamin B6 is essential for numerous bodily functions, and research has explored its potential benefits in several areas:
* **Brain Function and Neurotransmitter Synthesis:** As a coenzyme for synthesizing several neurotransmitters (e.g., serotonin, dopamine, GABA, norepinephrine), Vitamin B6 is important for cognitive function and mood regulation. Some research suggests that adequate B6 intake may support brain health, particularly in older adults, though more definitive studies are needed (NIH ODS).
* **Homocysteine Levels and Cardiovascular Health:** Vitamin B6, along with B12 and folate, plays a crucial role in lowering homocysteine levels in the blood. Elevated homocysteine is considered a risk factor for cardiovascular disease. Supplementation with B6 may help reduce homocysteine, contributing to cardiovascular health, although direct evidence linking B6 supplementation to reduced cardiovascular event risk is still under investigation (Cochrane, NIH ODS).
* **Reducing Nausea in Pregnancy:** Vitamin B6, specifically pyridoxine, has been studied and is often used to help manage nausea and vomiting during pregnancy (morning sickness). It is recognized as a first-line treatment in some clinical guidelines, though individual responses vary (MedlinePlus).
* **Immune Function:** Vitamin B6 is involved in immune responses, including the production of lymphocytes and other immune cells. Deficiency can impair immune function, while adequate intake supports a healthy immune system (NIH ODS).
* **Red Blood Cell Formation:** Vitamin B6 is critical for the synthesis of heme, a component of hemoglobin. Hemoglobin is necessary for oxygen transport in red blood cells. Insufficient B6 can lead to a type of anemia called sideroblastic anemia.
* **Premenstrual Syndrome (PMS) Symptoms:** Some studies have investigated Vitamin B6's potential to alleviate PMS symptoms, such as mood swings, irritability, and breast tenderness. The evidence is mixed, but some women report benefit, possibly due to its role in neurotransmitter synthesis (MedlinePlus). Commonly studied doses for PMS relief are in the range of 50-100 mg/day, but individual needs vary—talk to a licensed clinician.
While these areas show promising connections, it's important to remember that dietary intake is usually sufficient for most healthy individuals. Supplementation should be considered in consultation with a healthcare professional.
Evidence regarding Vitamin B6's effects comes from a combination of observational studies, randomized controlled trials, and reviews by authoritative health organizations.
* **Nausea and Vomiting in Pregnancy:** Multiple randomized controlled trials and meta-analyses have supported the use of pyridoxine for nausea and vomiting in pregnancy. The American College of Obstetricians and Gynecologists (ACOG) and MedlinePlus recognize it as a safe and effective treatment option, often combined with doxylamine. Studies have typically used doses in the range of 10-25 mg, one to three times daily, though individual responses vary.
* **Homocysteine Lowering:** A Cochrane review concluded that vitamin B supplementation (including B6, B9, and B12) effectively lowers plasma homocysteine concentrations. However, the review also noted that there isn't clear evidence yet that this reduction translates into a lowered risk of cardiovascular events or stroke. Further research is ongoing to establish this direct link (Cochrane).
* **Cognitive Function:** Observational studies have linked higher dietary intake and blood levels of B6 to better cognitive performance, particularly in older adults. However, intervention trials with B6 supplementation to improve cognitive function or prevent cognitive decline have yielded mixed results. The NIH Office of Dietary Supplements (NIH ODS) states that while B6 is crucial for brain function, the role of supplementation in preventing or treating cognitive decline is not firmly established.
* **Premenstrual Syndrome (PMS):** Several trials have investigated Vitamin B6 for PMS symptoms. Some studies have shown a modest benefit in reducing symptoms like breast pain and mood changes, possibly due to its role in neurotransmitter synthesis. However, a comprehensive review noted that the quality of evidence is often low, and more rigorous studies are needed to confirm these findings (Examine.com). Commonly studied doses for PMS relief are in the range of 50-100 mg/day.
* **General Dietary Intake:** The NIH ODS emphasizes that most healthy individuals get sufficient Vitamin B6 through diet, and deficiency is rare. Many studies focus on specific populations at risk of deficiency or those with certain conditions where B6 metabolism might be altered. The body's ability to utilize B6 can be impacted by certain medications or genetic factors.
Overall, while the essential role of Vitamin B6 in human physiology is undisputed, the evidence for widespread supplementation benefit in the general population beyond addressing deficiency or specific conditions like pregnancy-related nausea is still evolving.
Vitamin B6 is generally considered safe when consumed in amounts naturally found in food or within recommended dietary allowance (RDA) levels. However, high doses from supplements can lead to adverse effects.
Potential side effects of excessive Vitamin B6 intake (typically from supplements at high doses over extended periods, often exceeding 100-200 mg/day) include:
* **Peripheral Neuropathy:** The most well-established side effect of very high doses of Vitamin B6 is severe, progressive sensory neuropathy, characterized by numbness, tingling, and weakness in the extremities. This condition can sometimes be irreversible. This is most commonly associated with doses exceeding 1,000 mg/day, but cases have been reported at lower doses, such as 200 mg/day, taken over a long period (NIH ODS, MedlinePlus).
* **Skin Lesions:** Dermatological symptoms, including painful, disfiguring skin lesions, have been reported rarely with chronic high-dose pyridoxine.
* **Photosensitivity:** Increased sensitivity to sunlight.
* **Gastrointestinal Issues:** Mild nausea or heartburn in some individuals.
* **Ataxia:** Loss of control of voluntary movements.
The Food and Nutrition Board of the U.S. Institute of Medicine has set a Tolerable Upper Intake Level (UL) for Vitamin B6 at 100 mg per day for adults, primarily to prevent peripheral neuropathy. Intake above this level should only be under medical supervision.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Several warnings are associated with Vitamin B6 supplementation, particularly concerning high doses or specific medical conditions.
* **Neuropathy Risk:** Individuals taking high doses of Vitamin B6 supplements (above the Tolerable Upper Intake Level of 100 mg/day for adults) should be aware of the significant risk of developing peripheral neuropathy. Symptoms include numbness, tingling, and nerve damage. This risk increases with dose and duration of use. Discontinue use and seek medical attention if these symptoms occur (NIH ODS).
* **Pregnancy and Lactation:** While Vitamin B6 is often used for nausea in pregnancy, doses considerably above the recommended dietary allowance (RDA) should be used with caution and only under medical supervision. The safety profile at very high doses during pregnancy is not fully established. During lactation, B6 is excreted in breast milk, and high doses could potentially affect milk supply; consult a clinician.
* **Kidney Disease:** Individuals with impaired kidney function, especially those on dialysis, may have altered Vitamin B6 metabolism. They may be at a higher risk of deficiency or, conversely, accumulation of the vitamin if supplementing, requiring careful monitoring by a healthcare provider (DrugBank).
* **Liver Disease:** Chronic liver disease can also affect Vitamin B6 metabolism.
* **Drug Interactions:** Vitamin B6 can interact with certain medications, potentially altering their effectiveness or increasing the risk of adverse effects. (See 'Do Not Mix With' section for details).
* **Dependency:** There have been reports, though infrequent, of dependency on high doses of pyridoxine, where withdrawal symptoms (such as seizures in infants) occurred upon cessation (MedlinePlus).
* **Diagnostic Interference:** High doses of Vitamin B6 might interfere with certain laboratory tests, such as those for Parkinson's disease or certain urinary evaluations.
Always discuss any existing medical conditions or ongoing medications with a healthcare professional before starting Vitamin B6 supplementation. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
There are no absolute contraindications to Vitamin B6 at physiological doses from food. However, high-dose supplementation should be avoided or used with extreme caution in certain situations due to potential risks.
* **History of Peripheral Neuropathy:** Individuals with a pre-existing history of peripheral neuropathy, regardless of its cause, should avoid high-dose Vitamin B6 supplementation as it can exacerbate nerve damage or trigger new symptoms (Mayo Clinic).
* **Allergy or Hypersensitivity:** A known allergy or hypersensitivity to pyridoxine or any components of a B6 supplement would be a contraindication. Allergic reactions are rare but possible.
* **Leber's Hereditary Optic Neuropathy (LHON):** While not a direct contraindication for all B6 use, some evidence suggests that high doses of Vitamin B6, particularly when combined with B12 and folate, might be detrimental in individuals with certain genetic mutations associated with LHON. This is a rare condition, but it highlights the need for careful consideration in those with specific genetic predispositions.
In general, adhering to the Tolerable Upper Intake Level (UL) of 100 mg/day for adults is recommended unless otherwise advised and closely monitored by a healthcare professional for a specific medical reason.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Vitamin B6 can interact with several medications, potentially altering their efficacy or increasing the risk of side effects. It is important to discuss all medications and supplements with a healthcare provider before initiating Vitamin B6 supplementation.
Key interactions include:
* **Levodopa (L-DOPA):** High doses of Vitamin B6 can significantly reduce the effectiveness of levodopa, a medication used to treat Parkinson's disease, by increasing its metabolism in the periphery before it reaches the brain. This interaction is reduced with the co-administration of carbidopa (found in combination drugs like Sinemet), which inhibits B6's peripheral effects on levodopa. Patients on levodopa without carbidopa should avoid B6 supplementation (DrugBank, MedlinePlus).
* **Phenobarbital and Phenytoin (Anticonvulsants):** Vitamin B6 may decrease the blood levels and effectiveness of these anti-seizure medications. Dosing adjustments or monitoring may be necessary (MedlinePlus).
* **Isoniazid (INH):** This antibiotic, used to treat tuberculosis, is an antagonist of Vitamin B6, meaning it can interfere with the body's use of B6 and lead to deficiency, especially peripheral neuropathy. Vitamin B6 supplementation is often given concurrently with isoniazid to prevent these side effects. However, the exact dosage requires medical guidance.
* **Hydralazine:** This blood pressure medication can also interfere with Vitamin B6 metabolism, potentially leading to deficiency. Supplementation may be advised by a clinician.
* **Penicillamine:** Used for Wilson's disease and rheumatoid arthritis, penicillamine can bind to and increase the excretion of Vitamin B6, potentially leading to deficiency. B6 supplementation may be necessary.
* **Oral Contraceptives:** Some studies suggest that oral contraceptive use may increase the body's need for Vitamin B6, but the clinical significance is often considered minor for most individuals with adequate dietary intake. High doses of B6 are not typically recommended for this interaction.
* **Cycloserine:** This antibiotic can also act as a B6 antagonist.
* **Amiodarone:** While evidence is less robust, some reports suggest Vitamin B6 might reduce amiodarone levels.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Vitamin B6 is a water-soluble vitamin, meaning it doesn't need to be taken with fat for absorption. It can be taken with or without food. Many individuals find taking it in the morning suitable. For specific conditions like nausea in pregnancy, doses may be spread throughout the day.
* **With Food:** Taking Vitamin B6 with food can help minimize any potential for mild gastrointestinal upset that some individuals may experience, although this is uncommon with therapeutic doses.
* **Morning vs. Evening:** There is no strong evidence suggesting that taking Vitamin B6 at a particular time of day significantly impacts its efficacy or absorption for general use. The morning is often preferred for convenience, especially if combining with other morning supplements or medications.
* **Nausea in Pregnancy:** When used for morning sickness, healthcare providers often recommend taking pyridoxine throughout the day, sometimes up to three or four times daily, to help manage symptoms consistently.
The most important aspect of timing is consistency for conditions requiring regular supplementation. Always follow the specific instructions provided by a healthcare professional or the product label.
Source for this section: Sources for When should you take Vitamin B6?: Jumps to this entry in the sources and references list at the end of the page.
What interacts with Vitamin B6?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any vitamin + medication | Note | Category ruleConfidence: theoretical | Certain vitamins interact with specific medications (e.g., vitamin K with blood thinners).Source pending | Specific pairs are checked against a licensed source; confirm with your provider. |
Frequently asked questions about Vitamin B6
Vitamin B6 is a water-soluble vitamin essential for over 100 enzyme reactions in the body. It plays a crucial role in protein, carbohydrate, and fat metabolism, nerve function, neurotransmitter synthesis, red blood cell formation, and maintaining normal homocysteine levels (NIH ODS).
Yes, Vitamin B6 (pyridoxine) is commonly recommended and recognized as a safe and effective treatment for nausea and vomiting associated with pregnancy (morning sickness). It is often a first-line treatment and can be used alone or in combination with other medications (MedlinePlus).
Rich dietary sources of Vitamin B6 include poultry (like chicken and turkey), fish (such as salmon and tuna), organ meats (e.g., beef liver), potatoes, sweet potatoes, bananas, certain non-citrus fruits, and fortified cereals (NIH ODS).
Yes, it is possible to take too much Vitamin B6, primarily from high-dose supplements. Chronic intake above the Tolerable Upper Intake Level (UL) of 100 mg/day for adults can lead to peripheral neuropathy, characterized by numbness, tingling, and nerve damage. Always consult a healthcare provider before exceeding this limit (NIH ODS).
Vitamin B6 can interact with certain medications, notably reducing the effectiveness of levodopa (for Parkinson's disease) if taken without carbidopa. It can also decrease the efficacy of some anticonvulsants like phenobarbital and phenytoin. Conversely, some drugs, like isoniazid and hydralazine, can cause B6 deficiency, sometimes necessitating supplementation. Always declare all medications to your doctor (DrugBank).
Vitamin B6 is typically taken in the morning. Amounts for this vitamin vary by protocol, formulation and individual response, so follow the dose your clinician or the product label specifies.
Whether Vitamin B6 fits alongside testosterone replacement therapy depends on the protocol — dose, ester and ancillaries such as HCG or anastrozole — and on current bloodwork. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
"Peptides" is not one category — healing peptides, GLP-1 agonists, growth-hormone secretagogues and melanocortins each behave differently next to Vitamin B6. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
Published frequency for Vitamin B6 varies by protocol and formulation, so the label or prescription is what sets it. It is typically taken in the morning. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
The effect of a missed dose of Vitamin B6 depends on the protocol and formulation you are on. Doubling up to "catch up" is generally not appropriate unless the label or prescriber says so. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For Vitamin B6 the useful record is the dose, the time it was actually taken, and what else was taken in the same window. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
Which studies looked at Vitamin B6?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Vitamin B6 in Health and Disease(opens PubMed in a new tab)Nutrients · 2021 · PMID 34579110 · https://pubmed.ncbi.nlm.nih.gov/34579110/
- 2.The Role of Vitamin B6 in Peripheral Neuropathy: A Systematic Review(opens PubMed in a new tab)Nutrients · 2023 · PMID 37447150 · https://pubmed.ncbi.nlm.nih.gov/37447150/
- 3.Effect of magnesium and vitamin B6 supplementation on mental health and quality of life in stressed healthy adults: Post-hoc analysis of a randomised controlled trial(opens PubMed in a new tab)Stress Health · 2021 · PMID 33864354 · https://pubmed.ncbi.nlm.nih.gov/33864354/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 104817(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/104817
Verify at
Publisher search links for Vitamin B6. These are places to check the information — they are not citations, so they are not numbered.
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- MedlinePlus(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
- Examine.com(publisher search, opens in a new tab)Examine.com · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- DailyMed labeling archive(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Vitamin B6?
Plain-text summary, safe to quote verbatim:
Vitamin B6 is a water-soluble vitamin that is naturally present in many foods, added to others, and available as a dietary supplement. It serves as a coenzyme for more than 100 enzymes involved in metabolism, primarily protein metabolism, but also carbohydrate and fat metabolism.
Source: DoseRoutine — https://doseroutine.com/library/vitamin-b6
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Vitamin B6 — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/vitamin-b6
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