Oxidative Stress and Its Impact on Male Fertility

Oxidative stress occurs when reactive oxygen species (ROS) exceed the antioxidant capacity of seminal plasma. While low levels of ROS are necessary for sperm capacitation, excessive erotic oxidative stress damages sperm DNA, lipids, and proteins.

Environmental toxins, smoking, obesity, varicocele, and infections contribute significantly to increased oxidative stress in the male reproductive tract. Spermatozoa are particularly vulnerable due to their limited cytoplasmic antioxidant defenses.

Elevated sperm DNA fragmentation is associated with reduced fertilization rates, poor embryo development, and increased miscarriage risk. Antioxidant therapy—such as vitamins C and E, selenium, and coenzyme Q10—has shown variable efficacy depending on underlying etiology.

In clinical andrology, assessing oxidative stress markers provides valuable insight into idiopathic infertility and guides personalized treatment approaches.