Alternariol (commonly abbreviated as AOH) and his monomethylether AME is a toxic metabolite of Alternaria fungi.

[2] Alternariol exhibits antifungal and phytotoxic activity.

A 2017 in vitro assay study reported alternariol to be a full androgen agonist.

[4] The acute toxicity of AOH and AME is low, but in vitro the substances show a strong mutagenic and teratogenic effect.

The substances are associated with the development of esophageal cancer[5].