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Supplements/Vitamin

P-5-P (Pyridoxal-5-Phosphate)

Active coenzyme form of B6 — preferred over pyridoxine HCl for sensitive populations.

Mood & AnxietyWomen's HealthGeneral Wellness

Overview

Active coenzyme form of B6 — preferred over pyridoxine HCl for sensitive populations.

Natural sources
    Common forms

      Forms & variants of Vitamin B6 (Pyridoxine)

      Different chemical forms of Vitamin B6 (Pyridoxine) behave differently. Browse each form's mechanism, bioavailability, and best-use context.

      Parent
      Vitamin B6 (Pyridoxine)

      Cofactor for >100 enzymes including neurotransmitter synthesis.

      Mechanism of action

      Active cofactor for 100+ enzymes including neurotransmitter synthesis (GABA, serotonin, dopamine).

      Pathways
      • · Decarboxylation
      • · Transamination
      • · Heme synthesis

      Effects on the body

      Organ system effects

      Evidence-based benefits

      PMS symptom reduction

      Moderate evidence

      Lower neuropathy risk vs high-dose pyridoxine

      Limited evidence

      Potential side effects

      Common
        Rare
        • · Photosensitivity
        Serious
        • · Sensory neuropathy at >200 mg/d long-term

        Drug interactions

        No notable interactions reported.

        Supplement interactions

        Pairs well with

        None listed.

        Avoid combining with

        No specific avoidances listed.

        Dosing & bioavailability

        Typical dose
        20–50 mg
        Upper safe limit
        100 mg/d
        With food?
        Optional

        Where to buy

        Affiliate-style search links to reputable retailers. We don't endorse specific brands — verify third-party testing (USP, NSF, Informed Sport) before purchase.

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        Amazon
        Wide selection · fast shipping
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        iHerb
        Global delivery · curated brands
        Vitamin
        P-5-P (Pyrid…
        Thorne
        Practitioner-grade · NSF tested

        Scientific evidence (9)

        Systematic reviewToxicol In Vitro · 2017

        Pyridoxal-5-phosphate vs pyridoxine: clinical pharmacology

        Vrolijk MF, et al.

        Review of B6 forms and clinical uses.

        Key findings

        P5P preferred when PNPO enzyme activity is impaired.

        Open study
        Systematic reviewPubMed (NLM) · 1970

        PubMed: P-5-P (Pyridoxal-5-Phosphate) — PMS symptom reduction

        Live PubMed search

        Live results for "P-5-P (Pyridoxal-5-Phosphate) PMS symptom reduction" across the PubMed/MEDLINE peer-reviewed index.

        Key findings

        Opens current human and preclinical literature matching P-5-P (Pyridoxal-5-Phosphate) and "PMS symptom reduction". Filter by RCT, meta-analysis, or year on the results page.

        Open study
        Systematic reviewPubMed (NLM) · 1970

        PubMed: P-5-P (Pyridoxal-5-Phosphate) — Lower neuropathy risk vs high-dose pyridoxine

        Live PubMed search

        Live results for "P-5-P (Pyridoxal-5-Phosphate) Lower neuropathy risk vs high-dose pyridoxine" across the PubMed/MEDLINE peer-reviewed index.

        Key findings

        Opens current human and preclinical literature matching P-5-P (Pyridoxal-5-Phosphate) and "Lower neuropathy risk vs high-dose pyridoxine". Filter by RCT, meta-analysis, or year on the results page.

        Open study
        Systematic reviewPubMed (NLM) · 1970

        PubMed: P-5-P (Pyridoxal-5-Phosphate) — randomized controlled trial

        Live PubMed search

        Live results for "P-5-P (Pyridoxal-5-Phosphate) randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

        Key findings

        Opens current human and preclinical literature matching P-5-P (Pyridoxal-5-Phosphate) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

        Open study
        Systematic reviewPubMed (NLM) · 1970

        PubMed: P-5-P (Pyridoxal-5-Phosphate) — meta-analysis

        Live PubMed search

        Live results for "P-5-P (Pyridoxal-5-Phosphate) meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

        Key findings

        Opens current human and preclinical literature matching P-5-P (Pyridoxal-5-Phosphate) and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

        Open study
        Systematic reviewPubMed (NLM) · 1970

        PubMed: P-5-P (Pyridoxal-5-Phosphate) — pharmacokinetics

        Live PubMed search

        Live results for "P-5-P (Pyridoxal-5-Phosphate) pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

        Key findings

        Opens current human and preclinical literature matching P-5-P (Pyridoxal-5-Phosphate) and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

        Open study
        Systematic reviewPubMed (NLM) · 1970

        PubMed: P-5-P (Pyridoxal-5-Phosphate) — safety adverse events

        Live PubMed search

        Live results for "P-5-P (Pyridoxal-5-Phosphate) safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

        Key findings

        Opens current human and preclinical literature matching P-5-P (Pyridoxal-5-Phosphate) and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

        Open study
        Systematic reviewPubMed (NLM) · 1970

        PubMed: P-5-P (Pyridoxal-5-Phosphate) — dose response

        Live PubMed search

        Live results for "P-5-P (Pyridoxal-5-Phosphate) dose response" across the PubMed/MEDLINE peer-reviewed index.

        Key findings

        Opens current human and preclinical literature matching P-5-P (Pyridoxal-5-Phosphate) and "dose response". Filter by RCT, meta-analysis, or year on the results page.

        Open study
        Systematic reviewGoogle Scholar · 1970

        Google Scholar: P-5-P (Pyridoxal-5-Phosphate) — clinical evidence

        Live Scholar search

        Cross-database citation index for P-5-P (Pyridoxal-5-Phosphate) as it relates to "clinical evidence".

        Key findings

        Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

        Open study
        Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.