Vitamin B6
Also known as: Pyridoxine, Pyridoxal-5-phosphate (P5P)
Vitamin B6 is required for more than 100 enzyme reactions in metabolism and plays roles in brain development and immune function. It is widely available in food and included in most B-complexes and multivitamins, so deficiency is uncommon. The main educational point is the ceiling: taking high supplemental amounts for a year or longer can cause severe nerve damage. It is also studied for PMS and pregnancy-related nausea, where evidence is limited and any pregnancy use belongs with a professional.
Snapshot
What this page can tell you: Commonly discussed timing, food notes, caution categories, and an honest note on how much source review this entry still needs.
What it cannot: Whether this is appropriate for you personally, or that it treats, prevents, or cures any condition. Informational only — discuss with a clinician or pharmacist.
🕒 Timing
When: Morning, With a meal
Food: With or without food
Commonly taken in the morning or with meals; timing is flexible.
💊 Common use range
1.3–2 mg
Adult upper limit is 100 mg/day from all sources — count your B-complex and multivitamin toward it.
Ranges are informational, not a recommended dose. Talk to a professional about what is right for you.
🤔 Worth considering?
Evidence vs. effort: Moderate evidence relative to burden
Easy to get from food and B-complexes, and deficiency is uncommon. The practical caution is dose creep: stacking a B-complex with standalone B6 can approach the nerve-damage threshold over time.
A general summary, not a recommendation. Whether something fits your situation is worth discussing with a healthcare professional.
⚠️ Commonly noted interactions (supplements)
None listed.
Often about absorption or timing rather than danger — separating doses is common. This list is not exhaustive.
🧭 Caution level
Ask a clinician or pharmacist before use.
- Narrow margin — easy to exceed the upper limit at higher doses
- Seizure-medication interaction
- Higher caution if you take certain antibiotics (space doses apart)
Caution level is an informational summary of commonly discussed caution categories and doses — not a safety rating, approval, or medical advice. Low caution does not mean safe for you.
🩺 Medication caution categories
- Seizure medication
- Certain antibiotics
🏥 Surgery & procedure caution
Not a well-established surgical concern; share your full supplement list with your care team.
If you have a procedure scheduled, bring your full supplement list to your surgical and anesthesia team. Do not stop prescribed medication unless your clinician tells you to. Do not start or stop supplements based only on this app.
✅ Quality checklist
- Prefer products with third-party testing or a certificate of analysis (COA).
- Check the label for the exact form and the elemental or active amount per serving.
🧩 Commonly paired with
🔁 Alternatives
🗣️ Questions for a professional
- Adding up all my supplements, how much B6 am I taking daily — and is that a sensible long-term amount?
🔬 Evidence snapshot
Vitamin B6 supports over 100 enzyme reactions, brain development, and immune function; deficiency is uncommon in the U.S. Long-term high-dose supplementation can cause severe nerve damage, which is why the 100 mg/day adult upper limit matters.
🧪 Forms & quality
Needs evidence review — no source-reviewed information yet. We only show dose and monitoring details after they have been checked against reputable sources.
See the supplement glossary for what form names like "L-", chelated, or standardized extract mean.
📏 Dose & monitoring
NIH ODS adult upper limit is 100 mg/day from all sources. High supplemental amounts taken for a year or longer can cause severe nerve damage (loss of control of body movements), usually improving after stopping.
Evidence vs. burden: Moderate evidence relative to burden
😐 Commonly reported side effects
- Long-term high doses: nerve damage (numbness, loss of movement control)
- Nausea at high doses in some people
Non-exhaustive and individual.
🔄 Cycling & breaks
Not typically cycled.
📅 Daily use notes
Add up B6 across every product you take — B-complex, multivitamin, standalone B6 — before considering more. Epilepsy medication and the antibiotic cycloserine have B6-related interactions worth discussing with a professional.
📋 Source review status
Source-reviewed — last reviewed 2026-07-03
Reviewed against the NIH ODS vitamin B6 consumer fact sheet; editorial pass still pending.
Research backlog (queries to verify):
- vitamin B6 sensory neuropathy dose threshold duration
- vitamin B6 PMS nausea pregnancy evidence review
📚 References
- NIH ODS — Vitamin B6NIH ODS — Verified 100+ enzyme-reaction role, uncommon deficiency, 100 mg/day adult UL, long-term high-dose nerve-damage warning, and cycloserine/epilepsy-drug/theophylline interactions.
Verified against the source shown. See the research-status page for how review works.
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