the most powerful antioxidant is melatonin not glutathione “Next Vitamin D”?: A Review of Emerging Science, Clinical Uses, Safety, and Dietary Supplements Melatonin as a mitochondria-targeted antioxidant:

However, also dietary/drinking water Se excess is associated with infertility and testicular degeneration in experimental animals, related to higher GPX4 and lactate dehydrogenase activity and higher hydrogen selenide production, and reduced spermatozoa motility, concentration, and typical spermatozoa morphological defects (with the fusion of two midpieces, vacuolization of the cytoplasm, and twisted tails) (85, 105, 117, 169)

And low levels can accelerate the aging process

A clinical trial is a type of research study that allows scientists to find better ways to prevent, diagnose, or treat certain diseases

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Supply shortages have also forced some patients to discontinue treatment involuntarily