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This review discusses the physiological basis, history, and current development of male hormonal contraception, highlighting its potential risks and benefits, but reports no new research findings.

This study reported that semen quality improved in three young men after discontinuing long-term finasteride use, although meiotic abnormalities persisted.

This study reviews the mechanisms by which SARS-CoV-2 may impact male fertility, noting potential disruptions in spermatogenesis and hormone secretion, and underscores the need for follow-up in recovered men.

This case report describes a 40-year-old man whose secondary infertility, observed after prolonged finasteride use for hair loss, resolved following discontinuation of the drug, resulting in a live birth.

This review suggests that while finasteride for male pattern hair loss was previously considered safe, there is now evidence associating 5-α reductase inhibitors with significant sexual and reproductive side effects.

This review discusses the structure and function of the testes in male reproduction and development, noting the complex hormonal regulation within the hypothalamic-pituitary-gonadal axis but reports no new clinical results.

This chapter reviews the role of the testes in producing and functioning of testicular androgens and protein hormones, but it presents no new clinical results.

This study reports that a young man with severe testotoxicosis maintained spontaneous fertility despite suppressed FSH levels, underscoring the importance of high intratesticular testosterone levels for spermatogenesis.

This study found that finasteride treatment in male rats may lead to changes in connexin 43 expression in the testes of their offspring, potentially affecting spermatogenesis.

Environmental factors and exposure to toxins may contribute to male infertility by affecting sperm and hormone function.

In this study, fenugreek seed extract showed significant androgenic and spermatogenic effects in male rats, likely through inhibiting testosterone metabolism, without impacting cardiovascular health.

Finasteride may decrease semen quality but not harm sperm production, and stopping the drug can improve semen quality; hyperprolactinemia can cause infertility but is treatable with medication.

This article evaluated evidence on finasteride's effects on male reproductive health, finding contradictory data about its adverse effects, but consensus that such cases are infrequent in research and clinical settings.

This study reports that two oral hormonal agents, dimethandrolone undecanoate and 11β-methylnortestosterone dodecylcarbonate, may effectively suppress hormones to contraceptive levels in men with mild side effects, though longer-term trials are required to confirm their safety and efficacy.

This study found that while finasteride effectively improves hair growth in male androgenetic alopecia, it may affect fertility at higher doses, and the evidence on its long-term sexual side effects is inconsistent and requires more rigorous research.

In this study, oral melatonin given to male Pomeranian dogs with Alopecia X improved semen quality and testicular blood flow in a dose-dependent manner, but altered hormonal balance, indicating complex effects that require further investigation for long-term implications.

This chapter reviews the presence and roles of stem cells in various body systems, focusing on their lifelong function in animals and humans, and reports no new experimental findings.

This study suggests that finasteride at doses of 5 mg/kg BW or higher may adversely affect spermatogenesis and male fertility in NMRI mice.

This review explores the mechanisms of intratesticular control of steroidogenesis and indicates the need for further controlled studies; it presents no new experimental findings.

This article reviews the coordination of the hypothalamic-pituitary-gonadal axis, male fertility, and therapies for hypogonadism, but reports no new clinical findings.

This study found that untreated men with coeliac disease exhibited androgen resistance, potentially linked to sexual dysfunction, which improved as intestinal health improved, a pattern not observed in other chronic illnesses.

This study found that combining cyproterone acetate with testosterone enanthate was highly effective in suppressing spermatogenesis, suggesting potential as a reversible male contraceptive method.

This study found that zinc deficiency in goats led to lower plasma zinc levels, decreased growth rate, smaller testicles, reduced libido, and was associated with higher mortality compared to control goats.

The authors reported that young men with infertility-related conditions experienced improved seminal quality after stopping finasteride, suggesting potential adverse effects on fertility during treatment.

In this study, finasteride treatment for 56 days in adult rats led to sloughing of immature germinal cells and reduced sperm content in the epididymis, indicating its importance for maintaining spermatogenesis.

This article reviews the effect of aging on male hormone levels and fertility, highlighting the need for more research on the benefits and risks of androgen supplementation in older men.

This article discusses concerns and recommendations from a French-speaking andrology society regarding COVID-19's potential impact on men's reproductive health and calls for further research in this area.

This discussion explores advances in intravital imaging for visualizing stem cells, highlighting key discoveries and potential future developments; it reports no new experimental results.

This study concluded that mesotherapy with a dutasteride-containing solution was the most effective option for treating androgenetic alopecia in males, promoting hair growth and reducing hair loss.

This study found that paternal exposure to finasteride in male rats may impair fertility and affect androgen-sensitive spermatogenesis in their male offspring.