Exploratory Review on Male Fertility Potential of Acetyl-Eugenol: Mechanistic Insights, Experimental Evidence, and...

Male infertility contributes to nearly half of all infertility cases worldwide and is closely linked to oxidative stress, inflammation, endocrine imbalance, and environmental toxicant exposure, all of which impair spermatogenesis and sperm function. Interest in naturally derived bioactive compounds has increased due to their potential multitarget therapeutic effects and relatively favorable safety profiles. Acetyl-eugenol, a structural derivative of eugenol found in Syzygium aromaticum and other aromatic plants, has demonstrated antioxidant, anti-inflammatory, and cytoprotective activities in experimental studies. This review critically evaluates the potential role of acetyl-eugenol in male reproductive health, focusing on its pharmacological properties and proposed mechanisms of action. Available preclinical evidence suggests that acetyl-eugenol may reduce oxidative stress by scavenging reactive oxygen species, enhancing endogenous antioxidant defenses, and modulating inflammatory pathways such as NF-κB signaling. It may also contribute to the preservation of testicular structure and function, including protection of Sertoli and Leydig cells. However, current evidence remains limited and is derived predominantly from in vitro and animal studies, with very limited direct evidence in humans. Many proposed reproductive benefits are inferred from studies involving eugenol or related compounds rather than acetyl-eugenol specifically. In addition, conflicting findings regarding dose-dependent toxicity, insufficient pharmacokinetic data, and the absence of standardized clinical studies limit definitive conclusions regarding efficacy and safety. Overall, acetyl-eugenol represents a promising candidate for mitigating oxidative stress-associated male reproductive dysfunction, but its therapeutic potential remains preliminary. Further well-designed experimental and clinical studies are necessary to clarify its mechanisms, safety profile, and translational relevance in male infertility management.