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Combination index (CI) values of equimolar combinations of curcumin (C), sulforaphane (S), and dihydrocaffeic acid (D) on the viability of HT-29 colon cancer cells at 50% (A), 75% (B), and 90% (C) cytotoxicity levels. Values represent the mean ± standard error of two independent experiments performed on different days, with each experiment having three replicates. Abbreviations: CI 50, 75, and 90 = Combination index at 50%, 75%, and 90% cytotoxicity.
