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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.

Different monkey species in a lab showed varying levels of hair loss due to factors like type, sex, age, season, and living conditions.

Buschke-Ollendorff syndrome is a rare genetic disorder causing skin and bone changes, with some cases also showing ADHD or developmental delays.

PCOS is linked to a higher risk of endometrial cancer but not ovarian or breast cancer, and more research is needed on its role in cancer development and treatment effects.

Sex hormones may influence COVID-19 severity, with males at higher risk, and certain hormone therapies could potentially treat the virus.

The chapter explains the causes of excessive hair growth and masculinization in women and how to measure hormone levels related to these conditions.

Taking oral testosterone with or without dutasteride increases testosterone levels and could be an effective treatment for low testosterone.

Excess male hormones in postmenopausal women can cause health issues and increase the risk of heart disease and diabetes; treatment depends on the cause.

Testosterone reduces key molecules needed for early pregnancy in rats.

Finasteride has different absorption and metabolism in male and female rats, with higher concentrations in certain organs and mostly excreted through feces.

No significant hormone differences found in postmenopausal women with androgenetic alopecia.

Melatonin affects many body functions beyond sleep by interacting with specific receptors in various tissues.

Certain genetic variations in the AR and ERβ genes can affect androgen levels in women.

The conclusion is that hair growth can be improved by activating hair cycles, changing the surrounding environment, healing wounds to create new hair follicles, and using stem cell technology.

The document concludes that for hair and feather growth, it's better to target the environment around stem cells than the cells themselves.

Low SHBG and high FAI, FT, and DHEAS levels are effective in identifying PCOS.

Genes play a significant role in male-pattern baldness, and understanding them could lead to new treatments and insights into related health issues.

Cyproterone acetate treatment is safe and causes mild feminization, which increases with added estrogen.

Women with PCOS have unhealthy changes in their cholesterol particles that are not related to their body weight.

Finasteride has a higher risk of reproductive side effects than minoxidil.

Birth control pills help treat skin and hair growth problems linked to high male hormone levels.

Skin diseases linked to insulin resistance should be managed to prevent diabetes and reduce heart disease risk.

Vitamin D and estrogen may help protect heart and kidney health, and maintaining sufficient vitamin D levels could be especially beneficial for African Americans, postmenopausal women, and people with chronic kidney disease.

The enzyme type 1 5α-reductase is more active in the hair follicle's lower part than in the skin's outer layer.

The paper suggests that hair loss might be caused by skull growth, not just DHT's effect on hair follicles, and calls for more research.

Men with liver cancer have higher levels of a specific testosterone byproduct in their liver and blood, despite overall lower male hormone levels.

Hormone therapy may increase migraines in transgender women and decrease them in transgender men; more research is needed on migraine management in transgender individuals.

Birth control pills with low-dose estrogen and antiandrogenic progestins can effectively treat acne.

Eyelashes are important for looks and eye protection, and more people are treating sparse eyelashes; more research is needed to understand eyelash biology and improve treatments.

Cyproterone acetate is a safe treatment that causes mild feminizing effects and is more effective with added estrogens.