Onion
Onion is a fresh vegetable with no significant histamine content and no known histamine-raising effect.
Onions don't contain meaningful histamine and aren't typically associated with histamine liberation or DAO blocking.
-
No fermentation, no problem — fresh onions haven't undergone the bacterial processes that cause histamine to accumulate, unlike pickled onions which are a different story
-
Pickled vs. fresh — pickled or fermented onions are considerably higher in histamine due to the fermentation process, so the preparation makes a big difference here
Fresh onions are generally considered a safe, low-risk choice.
Try Histamine Tracker
Finally understand your histamine reactions. Scan meals with your camera, log symptoms naturally, and see daily insights based on YOUR patterns. Try free for 7 days.
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)