Glutathione: subcellular distribution and membrane transport Antioxidant Potential of Glutathione and Crosstalk with Phytohormones in Enhancing Abiotic Stress Tolerance in Crop Plants Selenium is a constituent of the enzyme: (A) Glutathione peroxidase.. (B) Homogentisate oxidase (C) Tyrosine hydroxylase (D) Phenylalanin hydroxylase Maintaining healthy glutathione levels in the body is vital for optimal health. This powerful antioxidant helps detoxify the liver, boosts immune function, and protects cells from oxidative stress. To naturally support healthy Item Scheme showing the enzymatic reactions that catalyze the pyruvate dehydrogenase complex, including pyruvate dehydrogenase activity and diaphorase activity of DLD (A) as well as the glutathione reductase peroxidase activity (B).