Effect of Co-Fe NPs on viability assayed by Alamar blue. Cytotoxicity was examined in different cultured cells: (A) Caco-2, (B) primary dendritic Cells and (C) TK6 were treated with 0 – 1 mM Co-Fe NPs for 24 and 72 h on all different cell lines. Cell Viability was assessed by Alamar blue assays and results are presented as ratio of control (untreated group). Mean ± SD of three independent experiments performed in triplicate. * Significant differences of each point from the control at P<0.05.