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The pineal gland plays a central role in circadian rhythm regulation through the secretion of melatonin

Thats where sperm DNA fragmentation testing (also known as Halosperm Testing) comes in

Glutathione can also prevent oxidative stress in erythrocytes (red blood cells)

This reference does not suggest if a nootropic works or not -- but it does explain why it may be categorized as a nootropic, as well as serving as a starting point for additional research

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Given differences among trials regarding antioxidant intervention type, altitude reached, exposure duration, and sample size, clinical and methodological heterogeneity was assumed