GPT and neoplasm: In order to confirm that consumption of the essential oil was not toxic, we orally administered both the dose used in our tumor model (0.348 mg/kg of body weight) and a higher (7.5-fold) dose for 3 or 10 days in mice not harboring tumors and then measured serum levels of aspartame transaminase (AST/SGOT), alanine transaminase (ALT/SGPT), and alkaline phosphatase (ALP).