Glutathione peroxidase activity in seminal plasma and its relationship to classical sperm parameters and in&am Glutathione cycle and other antioxidants in protecting sperm against Download Scientific Diagram Cysteine improves boar sperm quality via glutathione biosynthesis during the liquid storage Most people are surprised to learn that sperm health isn't something that changes overnight. From the early stages of development through to maturity, a sperm cycle takes around 72 to 90 days.