Aflatoxins B1, B2, G1 and G2, are secondary metabolites produced by the fungi Aspergillus flavus and Aspergillus parasiticus. Aflatoxin B1 is a potent hepatocarcinogen in experimental animals, but tumors may also occur in the colon and kidneys. Human exposure to aflatoxins may occur by the consumption of foods that have been contaminated by certain strains of Aspergillus flavus or Aspergillus parasiticus during growth or storage. Nearly all agricultural products are potentially subject to contamination with aflatoxins. Keywords :