Cell viability (%) Concentration (mg/L) Control Free NAC Lipo NAC 0 100 ± 0.00 100 ± 0.00 100 ± 0.00 160 - 100 ± 0.00 100 ± 0.00 310 - 100 ± 0.00 100 ± 0.00 630 - 98 ± 0.31 100 ± 0.00 1250 - 98 ± 0.05 100 ± 0.00 2500 - 98 ± 0.02 100 ± 0.00 5000 - 97 ± 0.61 100 ± 0.00

Table 2: Cell viability of epithelial lung cells exposed to free or liposomal NAC.