Table provides a summary of the findings from applying the 100% qNMR method to the two non-polar extracts. The curcumin content was 95.16% and 92.57% in batches A and B respectively of the curcumin dietary supplement. In addition, batches A and B contained some 4 (0.26% and 0.76% respectively) when signals that coincided with the signals produced by 4 reference material were integrated (Figure ). The presence of curcumin(oid) degradation products in the non-polar extracts was confirmed by comparing their 1 H NMR spectra to those of purified natural curcumin (Figure ). NMR spectra of natural 1 inevitably show the presence of degradation compounds as minor constituents and were utilized as reference for the same degradation products in the spectra of the investigated CDS. After the presence of 4 as well as likely degradation products was accounted for, unidentified aromatic impurities were observed and quantitated (Figure ). In line with pharmacopoeial practices for unidentified impurities, the molecular weight of noncurcuminoid impurities was considered as the molecular weight of 1. Four different types of aromatic impurities were distinguished and their relative abundance measured via integration. Impurity 1 was associated with signals at 8.084, 7.905, and 7.870 ppm that had identical integration values, impurity 2 was associated with the signal at 7.893 ppm, impurity 3 was associated with the signal at 7.642 ppm, and finally, impurity 4 was associated with signals at 7.205 and 7.003 ppm.