Curcumin in combination with VIS inhibits proliferation in different cell lines. HaCaT (pointed bars), A431 (bricked bars) and HN cells (black bars) were pre-incubated with curcumin and thereafter irradiated with VIS. The proliferative potential was monitored by BrdU incorporation for 16h after the treatment. BrdU incorporation was reduced depending on the applied curcumin concentration and investigated cell specie. The data displayed are representative of three experiments performed with comparable results. Average absorbance values (mean ± SD) from sextuplicate replicates per experimental condition were calculated. * p ≤ 0.05, ** p ≤ 0.01, *** p ≤ 0.001, versus the respective control and ### p ≤ 0.01, ###p ≤ 0.001, versus another cell line treated with the same curcumin concentration.