the most powerful antioxidant is melatonin not glutathione and Health: Insights of Melatonin Action, Biological Functions, and Associated Disorders 5 Best Antioxidants for Sleep:

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Taking glutathione 30 minutes before a meal is a widely recommended practice

External factors, including pollution, toxins, lifestyle choices, and dietary habits, also contribute to oxidative stress and can significantly impact sperm quality and fertility outcomes

Decreased glutathione would therefore contribute to oxidative stress by altering the balance of ROS production to ROS scavenging