Hydrolyzed fumonisin B1 is a mycotoxin produced by Fusarium fungi that infect many cereal grains and other foods. Because of the high frequency and concentration of contamination, fumonisins are likely to have an impact on human and animal health. Fumonisins B1, B2, and B3 each have regulated limits set for corn in both the EU and US. Epidemiologic studies have associated fumonisins with the occurrance of human oesophageal cancer and neural tube defects. Hydrolyzed fumonisin B1 is a less toxic metabolite of fumonisin B1.