Aflatoxin is a potent cancer-causing toxin produced by the mold Aspergillus flavus that infects grains and peanuts. They are probably the best known and most intensively researched mycotoxins (mold toxins) in the world.

Researchers believe aflatoxin promotes cancer by inactivating a tumor suppressor gene called p53.

Limit your exposure to aflatoxin by choosing Valencia peanuts. They're grown in an arid climate where aflatoxin is not a concern. We like Maranatha Peanut Butter made with organic Valencia peanuts.

References

Key TJ, Schatzkin A, Willett WC, Allen NE, Spencer EA, Travis RC.Diet, nutrition and the prevention of cancer.Public Health Nutr. 2004 Feb;7(1A):187-200. Ross RK, Yuan JM, Yu MC, et al.: Urinary aflatoxin biomarkers and risk of hepatocellular carcinoma. Lancet 339 (8799): 943-6, 1992. USDA Food Safety and Inspection Service, Fact Sheets http://www.fsis.usda.gov/Fact_Sheets/Molds_On_Food/index.asp.