The labels of the investigated CDS declared that both products contained "95% curcuminoids [plural!] from dried turmeric rhizome extracts (500 mg/tablet)", suggesting a natural source that contains multiple constituent curcuminoids. The labels also declared that 1 accounted for 76% of the content, while the remaining 19% of the 95% were due to 2 and 3. The 1 H NMR and (U)HPLC-UV analyses of the non-polar extracts confirmed the presence of the major component, 1.