Biological Markers article 6 Humans 5 Male 5 controlled study 5 human 5 male 5 biological marker 4 metabolism 4 Female 3 adult 3 female 3 nonhuman 3 Adult 2 Animals 2 Infertility, Male 2 Middle Aged 2 Oxidative Stress 2 Rats 2 Rats, Sprague-Dawley 2 Semen 2 Sprague Dawley rat 2 animal 2 animal experiment 2 animal model 2 blood 2 drug effect 2 male infertility 2 oxidative stress 2 pathophysiology 2