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 decrease than 0.7‰. Two commercial intact truffles and 14 commercial samples of pasta, sauce, olive oil, cream, honey, and fresh cheese flavored with truffle aroma have been analyzed, and the results from δ13C measurement had been evaluated compared with these of real "white truffle" vary and commercial artificial bis(methylthio)methane com...