Sheep anti-Zearalanol polyclonal antibody for IA, ELISA, WB, Dot, IHC. Zeranol (alpha-zearalanol) is a non-steroidal estrogen agonist. It is a mycotoxin, derived from fungi in the Fusarium family, and may be found as a contaminant in fungus-infected crops. It is 3-4x more potent as an estrogen agonist than the related compound zearalenone. Zeranol is approved for use as a growth promoter in livestock, including beef cattle, in the United States. In Canada, it is approved for use in beef cattle only. Its application is not approved for use in the European Union. Recently the group of Bern and collaborator has shown the inhibiting action of isoflavones on the growth of breast cancer cells induced by xenoestrogens such as o,p"-DDT and alkylphenols. Such studies have suggested phytoestrogens could be inhibiting the hormonal action of the natural estrogens.