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Updated: Nov 8, 2025

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Pyroluria: Fact or Fiction?

Benjamin Warren1, Jerome Sarris2,3, Roger T Mulder4

  • 1School of Psychology, Speech and Hearing, University of Canterbury, Christchurch, New Zealand.

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PubMed
Summary
This summary is machine-generated.

The "Mauve factor" (pyrroluria) is a condition with elevated urine pyrroles (HPL). Current research does not robustly link HPL to psychiatric disorders or confirm zinc and B6 as effective treatments.

Keywords:
B6HPLkryptopyrrolemauve factorpyroluriapyrroluriazinc

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Area of Science:

  • Psychiatry
  • Nutritional Medicine
  • Biochemistry

Background:

  • The "Mauve factor" (pyrroluria) describes elevated urine hydroxyhemepyrrolin-2-one (HPL) levels.
  • It has been hypothesized that HPL contributes to psychiatric disorders like schizophrenia, anxiety, and depression.
  • Nutritional supplementation with zinc and vitamin B6 is proposed as a treatment.

Purpose of the Study:

  • To review the scientific literature on pyrroluria and psychiatric symptoms.
  • To evaluate the validity of HPL testing.
  • To explore nutrient-based treatments and future research directions.

Main Methods:

  • A PRISMA systematic review was conducted.
  • Searches included PubMed, MEDLINE, PsycINFO, and EMBASE databases.
  • Keywords included hydroxyhemepyryrrolin (HPL), kryptopyrrole (KP), and pyrroluria.

Main Results:

  • Only three of 73 reviewed studies found significantly higher HPL levels in psychiatric populations.
  • No placebo-controlled treatment trials for pyrroluria were identified.
  • Evidence linking HPL to mental health symptoms, nutrient depletion, or treatment efficacy is insufficient.

Conclusions:

  • Elevated HPL is a poorly researched biomarker with unclear associations to mental disorders.
  • HPL testing is not recommended as a screening or treatment tool currently.
  • Further research is needed to validate HPL testing and assess the efficacy of zinc and B6 supplementation.