Mycoestrogens are estrogens produced by fungi. Among important mycoestrogens are zearalenone, zearalenol and zearalanol Although all of these can be produced by various Fusarium species, zearalenol and zearalanol may also be produced endogenously in ruminants that have ingested zearalenone. Alpha-zearalanol is also produced semisynthetically, for veterinary use; such use is prohibited in the European Union.

Mycoestrogens are estrogens produced by fungi. Among important mycoestrogens are zearalenone, zearalenol and zearalanol Although all of these can be produced by various Fusarium species, zearalenol and zearalanol may also be produced endogenously in ruminants that have ingested zearalenone. Alpha-zearalanol is also produced semisynthetically, for veterinary use; such use is prohibited in the European Union.