Vitamin B6

Also known as: pyridoxine, pyridoxal-5-phosphate, p5p, b6

Grade A — Strong Evidencevitaminfoundationalneurological
10–50 mgMorning with food

Vitamin B6 (pyridoxine/pyridoxal-5-phosphate) is a critical coenzyme for neurotransmitter synthesis — including serotonin, GABA, dopamine, and norepinephrine. It has strong evidence for PMS symptom relief and is essential for homocysteine metabolism. The active P5P form is preferred, particularly in those with liver dysfunction or genetic variants affecting conversion. Chronic doses exceeding 200mg/day carry a risk of sensory peripheral neuropathy.

TL;DR: Essential coenzyme for neurotransmitter synthesis (serotonin, GABA, dopamine). Strong evidence for PMS. Deficiency common in those on OCP or with poor diet.

😊Mood🧠Cognitive Performance⚡Energy🌙Sleep
Last reviewed: 2026-03-12

Quick Facts

Evidence

Grade A

Studies

2

Interactions

2

Forms

1

Evidence Rating: Grade A — Strong Evidence

Multiple high-quality RCTs, systematic reviews, or meta-analyses with consistent findings.

Interaction Warnings

Levodopa (L-DOPA)High Risk

B6 accelerates peripheral conversion of levodopa, reducing brain availability. Contraindicated without carbidopa.

Phenobarbital/PhenytoinModerate

B6 may reduce anticonvulsant blood levels.

Important Notes

  • Doses >200mg/day long-term associated with sensory neuropathy
  • P5P (pyridoxal-5-phosphate) is the active coenzyme form — preferred over pyridoxine HCl for high doses
  • Most people get adequate B6 from diet unless on oral contraceptives or isoniazid

Clinical Evidence (2 studies)

Vitamin B6 supplementation and PMS: RCT meta-analysis

Wyatt KM et al. (1999) — BMJ

B6 up to 100mg/day likely beneficial for PMS symptoms and premenstrual depression

View on PubMed

B6 and cognitive function in the elderly

Dakshinamurti K et al. (1990) — Ann N Y Acad Sci

B6 deficiency impairs cognitive function; supplementation in deficient elderly improves memory

View on PubMed

Alternatives to Consider

These supplements target similar goals and may be worth considering alongside or instead of Vitamin B6.

B-Complex

Grade B

Group of essential vitamins for energy metabolism, nervous system function, and mood. Methylated forms preferred for MTHFR variants.

⚡ Energy😊 Mood🧠 Cognitive Performance

Omega-3 Fish Oil

Grade A

Essential fatty acids with strong evidence for cardiovascular and mental health. EPA-dominant for mood; triglyceride form for absorption.

😊 Mood🧠 Cognitive Performance

Vitamin B12

Grade A

Critical for nerve function, DNA synthesis, and red blood cell formation. Vegans, elderly, and metformin users are at high risk of deficiency. Methylcobalamin preferred for neurological benefit.

🧠 Cognitive Performance😊 Mood

Related Supplements

B-Complex

Grade B — Moderate Evidence

Group of essential vitamins for energy metabolism, nervous system function, and mood. Methylated forms preferred for MTHFR variants.

Vitamin B12

Grade A — Strong Evidence

Critical for nerve function, DNA synthesis, and red blood cell formation. Vegans, elderly, and metformin users are at high risk of deficiency. Methylcobalamin preferred for neurological benefit.

Ashwagandha

Grade A — Strong Evidence

Ayurvedic adaptogen with strong clinical evidence for cortisol reduction (15-30%), stress relief, and exercise performance.

Folate (Vitamin B9)

Grade A — Strong Evidence

Essential for DNA synthesis, methylation, and mood regulation. ~40% of people have MTHFR variants reducing conversion — use methylfolate. Always pair with B12.

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⚕️ Important Disclaimer

This information is for educational purposes only. It is not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you take medications or have health conditions.

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