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Overexpression of cellular glutathione peroxidase does not affect expression of plasma glutathione peroxidase or phospholipid hydroperoxide glutathione peroxidase in mice offered diets adequate or deficient in selenium

26 By 1969, Researchers have discovered that SOD exhibits physiological catalytic activity by reducing O 2 to hydrogen peroxide, which was the first antioxidant enzyme discovered to utilize superoxide anions as substrates

10.1186/s12974-019-1434-3 67 MaY.ZhangY.JiangH.XiangS.ZhaoY.XiaoM.et al (2021)

The person will have an elevated TSH, with low levels of free T3 and free T4

Hormone levels naturally decline with age