Glutathione content and glutathione peroxidase activity of sperm in males with unexplained infertility CredoWeb FertilHom 20 sachets Fertilit masculine Glutathione improves testicular spermatogenesis through inhibiting oxidative stress, mitochondrial damage, and apoptosis induced by copper deposition in mice with Wilson disease ScienceDirect Cysteine improves boar sperm quality via glutathione biosynthesis during the liquid storage