Outcome
    Moderate Evidence

    Vitamin B6 (Pyridoxine) for Cognitive Function

    B6 lowers homocysteine but has not been shown to protect or improve cognition on its own.

    Overview

    B6 lowers homocysteine but has not been shown to protect or improve cognition on its own.

    Verdict

    Insufficient evidence

    How It Works

    Pyridoxal-5-phosphate is a cofactor in homocysteine transsulfuration and in synthesis of serotonin, dopamine and GABA.

    Dosing & Protocol

    Typical dose

    Recommended dose
    No established dose for cognition; do not exceed 100 mg/day from all sources
    Expected timeframe
    Not established - no benefit demonstrated

    Protocol

    the risk
    Chronic intake above 100 mg/day causes sensory peripheral neuropathy, sometimes irreversible - cases have occurred at lower doses with long-term use
    if deficient
    B6 deficiency is uncommon but occurs with isoniazid, penicillamine, alcohol use and renal dialysis; repletion there uses modest doses under medical guidance
    studied dose
    20-75 mg/day in the trials reviewed by Cochrane
    evidence note
    Verdict is insufficient - and the risk here is real
    what happened
    The Cochrane review of B6 for cognition found no benefit in either healthy or cognitively impaired older adults
    better evidenced
    Blood pressure control, exercise and hearing correction have far stronger cognitive evidence

    Evidence

    What the studies say

    Cochrane review of B6 for cognition found no benefit in healthy or cognitively impaired older adults. High chronic doses above 100 mg/day risk sensory neuropathy.

    No studies are yet linked to both Vitamin B6 (Pyridoxine) and Cognitive Function.

    Safety

    Caveats

    Hard ceiling of 100 mg/day from all sources, and lower for long-term use - chronic excess causes sensory neuropathy that may not fully reverse. Stop immediately and seek advice if you develop numbness, tingling or unsteadiness. B6 reduces the effect of levodopa when taken without carbidopa, and interacts with phenytoin and phenobarbital. Standard prenatal doses (10-25 mg for nausea) are safe in pregnancy; high doses are not.

    Less likely to help if

    Cognitively healthy adults and people with established cognitive impairment, in both of whom trials showed no benefit.

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    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.