The effect of curcumin on the viability of RAW264.7 cells under oxidative stress.

Cells were stimulated with curcumin (0, 5, 10, 20 μM) for 20 h or 16 h. The positive control group and curcumin-treated groups were then exposed to H2O2 (500 μM) for 4 h (a) or 8 h (b), respectively. The results are expressed as the mean±SE of six independent experiments. *P **P P 2O2, ##P 2O2, ANOVA analyses.