While the values measured for curcumin alone fell within the range of declaration ("95%"), the findings were in conflict with regard to two other declared properties: (i) the specific content of 1 was much higher than declared, which is in line with the observation that 1 was the only curcuminoid present; and, (ii) the demethoxy (2 and 3) and dihydro curcuminoids, which constitute the inevitable residual complexity of C. longa products derived from nature, were below the detection limit of the qNMR method (signal to noise ratio <1.5:1). This absence indicated that the material could not have been produced from plant material. Overall, the quantification results for 1, the absence of natural curcuminoid congeners, and the identification of unknown aromatic impurities implied that the investigated material was adulterated.