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The document concludes that the 5 alpha-reductase enzymes are important in steroid metabolism and related to various human diseases, with inhibitors used to treat conditions like male pattern baldness and prostate issues.

The document concludes that mouse models are crucial for studying hair biology and that all mutant mice may have hair growth abnormalities that require detailed analysis to identify.

Testosterone replacement therapy can prevent men from fathering children and should not be used by those wanting to stay fertile.

Testosterone may have a dual role in COVID-19, potentially worsening outcomes in men, and testosterone therapy could help some patients, but more research is needed.

Testosterone may both worsen and protect against COVID-19 effects in men.

Bald men may have a lower risk of testicular cancer.

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

High-dose radioactive iodine therapy does not harm fertility in thyroidectomy patients.

The document concludes that sex hormones are crucial for mammalian reproduction, health, and behavior, and require more research for therapeutic use.

Some common medications can harm male fertility, but many effects can be reversed.

COVID-19 might affect male fertility, but more research is needed to understand the full impact.

Products should be called 'sperm-safe' only after thorough, well-designed tests.

New male hormonal contraceptives show promise but need more research on long-term effects and funding for larger trials.

Oregano extract helps fix testis and sperm damage caused by finasteride.

Intratesticular PRP injections are safe but not proven to improve sperm retrieval in certain infertile men.

The research found that PCOS has common genetic factors regardless of how it is diagnosed and is linked to metabolic and reproductive issues.

Men have more severe COVID-19 outcomes than women.

CRISPR/Cas9 gene editing in cashmere goats increases hair follicles and fiber length, boosting cashmere yield.

A gene mutation in mice causes hair loss, weak bones, and protein buildup, showing how protein processing issues can lead to diseases.

The document explains how the male reproductive system works, its role in making testosterone, and how conditions like obesity can disrupt it, leading to low testosterone and fertility issues.

Betacoronaviruses, like COVID-19, may cause hormone system dysfunction and affect disease susceptibility and severity.

Wait 3 months after COVID-19 before trying assisted reproduction and further research is needed on COVID-19's effects on male hormones and fertility.

Some skin medications can harm male fertility, but they don't seem to cause birth defects from father's exposure.

Thyroid hormones and androgens affect gene expression in frog reproductive organs differently between males and females.

Men had worse COVID-19 outcomes than women in New York City.

Phthirusa pyrifolia extract may lower testosterone and harm male rat reproduction without damaging the liver or kidneys.

Certain drugs can cause male infertility, so fertility counseling and sperm preservation are advised.

Collagen supplements may improve skin, joints, and recovery, especially with added nutrients.

Dutasteride and finasteride may reduce sperm count and volume but don't affect movement or shape; effects are reversible after stopping.

Active vitamin D3 might protect hair follicles from radiation damage.