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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.

The review recommends hormone replacement therapy for women with premature ovarian insufficiency to manage symptoms and protect health, with specific approaches for different groups.

Finasteride may cause sexual side effects like erectile dysfunction, but they are reversible and affect less than 2% of men.

The document concludes that identifying the cause of amenorrhea is crucial for proper treatment.

5α reductase inhibitors treat hair loss but may cause sexual side effects and risks.

Melatonin helps Cashmere goats grow more hair by affecting certain genes and cell pathways.

Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.

Amenorrhea, or the absence of periods, should be evaluated by age 15 or within five years of early breast development, and is most commonly caused by conditions like polycystic ovary syndrome and hypothalamic amenorrhea.

COVID-19 may harm male fertility and damage the reproductive system.

Childhood ptosis can vary from a minor cosmetic issue to a serious condition and may signal other health problems.

5α-Reductase inhibitors can negatively affect male sexual function and, in some cases, significantly reduce sperm count, but these effects may be reversible.

Curcumin may help reverse aging by targeting specific genes.

Fetal-maternal stem cells in a mother's hair can help with tissue repair and regeneration long after childbirth.

Selective breeding caused the unique curly hair in Mangalitza pigs.

Testosterone is crucial for development, growth, and various body functions in mammals.

Researchers identified genes in scalp hair follicles that may affect hair traits and hair loss.

Finasteride causes harmful organ changes in female mice.

Ovulation disorders are a major cause of infertility and menstrual problems in women.

The study found that giant pandas have more melanin in black hair follicles than white, with gene expression differences that could affect hair color and skin health.

Father's finasteride use may affect son's fertility and testicular function.

Finasteride may improve sperm count in subfertile men with low sperm count.

Review finds no permanent solution for female hair loss.

Review determines effective, safe treatments for female hair loss.

Xiangdong black goats have moderate genetic diversity, minimal inbreeding, and important genes for reproduction, immunity, and other traits.

A 19-year-old male with delayed puberty was successfully treated for a condition that prevents normal hormone production.

HNG may help prevent the negative effects of chemotherapy on sperm production and white blood cell counts.

PCOS may be influenced by factors in the blood, not just the ovaries.

Adult hair follicle cells can create new hair follicles from corneal cells with the right support.

Hormone treatment for transsexual individuals is effective but carries risks like thromboembolic events and mood changes, with most side effects being minor and reversible.