Psyllium husks
Psyllium husks are a plain, unfermented fiber supplement with no known histamine content or release effect.
Psyllium is simply the outer husk of a seed, dried and ground — no fermentation, aging, or processing that would raise histamine.
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Used as a fiber supplement — psyllium husks are most commonly taken for digestive support and aren't associated with histamine in any meaningful way
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Gut effects worth noting — psyllium can influence gut motility and the gut microbiome over time; while this isn't a direct histamine mechanism, some people with histamine sensitivity find that gut health plays a role in how they tolerate foods overall
For most people with histamine sensitivity, plain psyllium husks are considered a comfortable choice.
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For educational purposes only. Not medical advice. Consult a healthcare professional for personal guidance.
References
- SIGHI Food Compatibility List — SIGHI (2026)
- Histamine and histamine intolerance — Maintz & Novak (2007)
- Histamine Intolerance: The Current State of the Art — Comas-Basté et al. (2020)
- Low-Histamine Diets: Is the Exclusion of Foods Justified by Their Histamine Content? — Sánchez-Pérez et al. (2021)
- Histamine Intolerance: Symptoms, Diagnosis, and Beyond — Jochum (2024)
- Guideline on management of suspected adverse reactions to ingested histamine — Reese et al. (2021)