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Mater Res
Sperm cells rely heavily on antioxidant defenses to protect themselves from oxidative damage, and selenium plays a central role in that process through enzymes such as glutathione peroxidase 4 (GPx4), which helps support normal sperm development and motility.45 Just as importantly, selenium has been studied alongside NAC in human clinical research
Chen XC, Yu R, Kang D, Tang
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Cysteine is particularly important because it forms disulfide bonds, the cross-links that give keratin its strength and resilience
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