is there heme in glutathione peroxidase importance of catalase Plant Peroxidases: Non-Heme Peroxidases with Large Functional Flexibility as a Core Component ROS-Processing Mechanisms and Signalling Trait: Oxidative Stress Risk (GPx-1) – Mechanism of heme oxygenase-1 regulation

Guo W, Ma S, Zhang Y, Liu H, Li Y, Xu JT

HGF/c-MET signaling The complex phenotype that results from c-MET signaling involves a number of molecular events, which have been described in detail in previous reviews [Trusolino et al

Safety and efficacy of 4% hydroquinone combined with 10% glycolic acid, antioxidants, and sunscreen in the treatment of melasma

The molecular athlete: exercise physiology from mechanisms to medals

So, while not an antioxidant by itself, part of MSMs action is to improve your bodys ability to make its own antioxidants. (article "MSM Health Benefits May Be Related To Its Sulfur Content" March 3, 2013) Research done with MSM indicates that this supplement is effective in reversing chemical or drug-induced liver damage, oxidative stress, inflammation and in reversing the resulting drop in glutathione levels