Butylated hydroxytoluene (BHT), also known as butylhydroxytoluene, is a lipophilic (fat-soluble) organic compound, chemically a derivative of phenol, that is useful for its antioxidant properties. European and U.S. regulations allow small percentages to be used as a food additive, but that is not without controversy as there are claimed links to child hyperactivity as well as to cancer. Conversely, BHT is advocated as a diet supplement and antiviral useful against herpes family viruses