GSR and hepatocellular carcinoma: Vitamin B-6 supplementation had no effect on the changes (Δ week 12 − week 0) of MDA, GSH, GSSG, and TEAC levels and the activities of SOD, GPx, GST, and GR (p > 0.05), but it significantly reduced (β = −2.4, standard error = 1.0, p = 0.02) plasma homocysteine after adjusting for age, gender, BMI, the baseline (week 0) levels of creatinine and ALT, smoking and drinking habits, and HCC stage.