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High levels of the protein Flightless I worsen ulcerative colitis symptoms in mice.

Long-term use of dutasteride for enlarged prostate may worsen blood sugar, cholesterol, and erectile dysfunction.

Finasteride worsens erectile dysfunction and lowers testosterone in men with enlarged prostates, unlike tamsulosin.

Blocking 5α-reductase can harm memory and brain structure, and increase harmful brain changes in male mice used for Alzheimer's disease research.

Estrogen replacement can improve skin health in menopausal women but doesn't reverse sun damage or prevent hair loss.

Estrogen helps improve skin aging and healing, especially in post-menopausal women.

Pregnancy can cause skin pigmentation, stretch marks, and changes in hair, nails, and sweat glands, with most resolving after birth.

Loestrin effectively normalizes testosterone levels and improves PCOS symptoms with minimal side effects.

Testosterone protects female heart cells from stress by activating estrogen receptors.

Older women face various skin issues like dryness and thinning, and treatments are available but can have side effects; proper skin care and legal health decisions are important.

Removing a testicular tumor in a dog reduced its aggressive behavior and skin problems.

AGA causes permanent hair loss; minoxidil helps men, finasteride helps men, minoxidil somewhat helps women, estrogens/antiandrogens lack evidence for women.

New treatments for male hypogonadism are effective and should be personalized.

Pregnancy can cause unique skin issues, some of which may risk the mother and baby's health and need careful treatment.

Estrogen affects how vitamin A is processed in mouse skin, which may impact acne treatment, hair growth, and skin defense.

Estrogen can temporarily slow down hair growth but this can be reversed.

Androgen deprivation therapy for prostate cancer can cause sexual, physical, and psychological side effects, and doctors should manage these carefully.

Smoking may contribute to hair loss in men.

After menopause, women lose a lot of skin collagen, but estrogen replacement might improve skin health.

Some hair loss can be treated, especially in women due to nutrition, but some types remain untreatable.

Oral contraceptives help treat hyperandrogenic disorders, improving symptoms like excessive hair and acne.

Taking DHEA for a year is generally safe for postmenopausal women but may cause acne and more facial hair without improving metabolism or aging.

Testosterone therapy can help improve sexual desire and function in postmenopausal women but may cause side effects and is not FDA-approved for this use.

Menopause significantly reduces skin collagen, leading to thinner, less elastic skin, and hormone replacement may help but requires careful consideration.

The document explains hair biology, the causes of hair loss, and reviews various hair loss treatments.

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.

Testosterone increases certain kidney protein levels, potentially raising blood pressure.

Skin problems in older people can indicate hormonal diseases, nutritional deficiencies, or conditions like diabetes, menopause, and HIV.

The document concludes that treating female hair loss should target reducing excess androgen and blocking its effects on hair follicles, with the best treatments being hormonal therapy, adrenal suppression, and topical minoxidil.

New treatments for enlarged prostate are being developed to be more effective and have fewer side effects.