Table . The content of curcumin (1) in the commercial samples was determined using the 100% qHNMR approach, capturing both known and unknown on a relative molarity basis and converting them to % values by calculating the unknown as 1. The non-natural curcumin contained 95.16% and 92.57% in the curcumin dietary supplement, respectively, which contents of curcumin appear trying to make up with curcuminoid contents. respectively. Reference compounds were: curcumin in trace [7], piperine in trace [4], vitamins B1 (thiamine) in trace [3], B2 (riboflavin) in trace [2], and B6 (pyridoxine) in trace [1].