Oxidative Medicine and Cellular Longevity / 2016 / Article / Fig 2

Clinical Study

Skin Antiageing and Systemic Redox Effects of Supplementation with Marine Collagen Peptides and Plant-Derived Antioxidants: A Single-Blind Case-Control Clinical Study

Figure 2

Glutathione cycle parameters: erythrocyte levels of total glutathione (reduced and oxidized forms, GSH + GSSG) (a) and erythrocyte enzymatic activities of glutathione-S-transferase (b) and of glutathione peroxidase (c) in the study group of patients (), before and after food supplement administration period. Values are represented as mean (□), standard error of the mean (upper and lower limits of the box), and 1.96 × standard error (upper and lower whiskers). GSH: reduced glutathione; GSSG: oxidized glutathione; RBC: red blood cells; Hb: haemoglobin; GST: glutathione S-transferase; GPx: glutathione peroxidase. Reference normality range: RBC total glutathione (0.5–1.6 mg/g Hb); RBC GST activity (0.2–0.7 U/mg Hb); RBC GPx activity (18.0–54.0 U/g Hb).
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