Assessment of oxidative damage biomarkers. Liver damage was evaluated by measuring protein carbonylation (A) and thiobarbituric acid reactive substances (TBARS) (B), while matrix remodeling was assessed via matrix metalloproteinase 9 (MMP-9) activity in zymography assays (C) of the livers of C57BL/6 mice subjected to prophylactic piperine treatment for 8 days, followed by APAP intoxication. The different letters indicate statistical differences between the groups. In panels A and B, any letter other than “a” signifies a difference from the control group, and any letter other than “b” signifies a difference from the APAP group. In panel C, the letter “b” indicates that the P40 group is different from the other experimental groups, as determined by a one-way analysis of variance followed by Tukey’s post hoc test. Statistical significance is considered at p < 0.05.