Mycotoxin profile 4 min readUpdated February 1, 2026

Zearalenone

Zearalenone is a Fusarium mycotoxin notable for its estrogen-like activity. It is primarily a food- and feed-safety concern rather than an indoor-air topic.

Reviewed by the MoldDetox.ai clinical education team

At a glance

Made by
Fusarium species
Main exposure
Contaminated grains (corn, wheat)
Health note
Estrogen-like activity in studies
Oversight
Monitored in food and animal feed

The short answer

Zearalenone is a mycotoxin produced by Fusarium species that contaminate grains such as corn and wheat. It is notable for estrogen-like (estrogenic) activity in animal studies, which is why it is monitored in food and animal feed. Human exposure is essentially dietary, not through indoor air.

What is Zearalenone?

A Fusarium mycotoxin with estrogen-like activity, encountered through contaminated grain and monitored in food and feed.

Quick summary

  • Produced by Fusarium on grains.
  • Has estrogen-like activity in studies.
  • Exposure is dietary, not indoor air.
  • Monitored in food and animal feed.

This information is educational and does not diagnose or treat any condition. It is not for emergencies. If you have trouble breathing, chest pain, fainting or other severe symptoms, call your local emergency number right away.

Where it comes from

Zearalenone forms when Fusarium grows on cereal crops, especially corn and wheat, in the field or in storage. Because of this, it is a recognized food- and feed-safety issue that regulators track.

Health context

Zearalenone can bind estrogen receptors and produce estrogen-like effects in animals, which is the main focus of research and the reason for feed and food limits. Its relevance is dietary; it is not a typical indoor-air exposure.

Key point: Zearalenone is a food-and-feed topic driven by its estrogen-like activity.

Key takeaways

  • Zearalenone is a Fusarium mycotoxin on grains.
  • It has estrogen-like activity in studies.
  • Exposure is dietary; food and feed are monitored.

Frequently asked questions

Is zearalenone an indoor-air problem?

No. Zearalenone is essentially a food- and feed-safety topic, arising from Fusarium on grains. Human exposure is dietary rather than through indoor air.

References & further reading

This article is for general education only and does not diagnose, treat or replace care from your own licensed clinician. MoldDetox.ai provides physician-supervised, educational health services. It does not provide emergency care. Testing and recommendations support — but do not replace — evaluation by your own licensed clinician.

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