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This remains the most direct explanation offered by the people reporting it

In humans, the sperm count, sperm concentration, progressive motility, total motility, and normal morphology in individuals exposed to OP pesticides decreased compared to those who were not exposed in a sample of 766 male subjects (349 exposed to OP pesticides, 417 unexposed [control]) [35]

I'm not a doctor, and this isn't medical advice

Why does BAC Water contain benzyl alcohol

Chronic stress and anxiety have been linked to lower glutathione levels, likely because the biochemical stress response generates free radicals that consume glutathione