Fumonisin is a type of mycotoxin produced by certain molds, particularly Fusarium species, that commonly grow on crops like corn. It can contaminate food and feed, posing health risks to both humans and animals. Exposure to fumonisin has been linked to various health issues, including esophageal cancer and neurotoxic effects in animals. Regulatory agencies monitor fumonisin levels in food products to ensure safety and minimize potential health risks associated with its consumption.