In complete, 24 real white truffles harvested in Italy had been analyzed, attaining a δ13C values between -42.6‰ and -33.9‰, with a maximum normal deviation lower than 0.7‰. Two commercial intact truffles and 14 commercial samples of pasta, sauce, olive oil, cream, honey, and recent cheese flavored with truffle aroma have been analyzed, and the results from δ13C measurement have been evaluated compared with those of real "white truffle" vary and business synthetic bis(methylthio)methane customa...