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

Dutasteride helps hair growth in those unresponsive to finasteride, but may cause more sexual dysfunction.

Mice are useful for researching human hair loss and testing treatments, despite some differences between species.

Pregnancy can cause specific skin conditions that need correct diagnosis and treatment to protect both mother and baby.

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.

Finasteride doesn't affect bone density in male rats.

Testosterone replacement may help post-menopausal women with androgen insufficiency, but more research is needed on its benefits and risks.

Using anabolic androgenic steroids can cause serious, lasting health problems in many parts of the body.

Testosterone therapy aims to treat hormone deficiencies and various conditions safely and effectively, but requires careful patient monitoring due to potential side effects.

Bimatoprost ophthalmic solution 0.03% safely and effectively increases eyelash growth when applied to the upper eyelid.

Understanding hair follicle biology and stem cell control could lead to new hair loss treatments.

Androgens affect bone and fat cell development differently based on the cells' embryonic origin.

Interferons are effective for some skin conditions and cancers, but can have side effects and need more research for optimal use.

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.

Cat color patterns are determined early in development by gene expression and epidermal changes, with the Dickkopf 4 gene playing a crucial role.

Finasteride causes lasting fertility decrease in rats.

Ganoderma lucidum may help treat prostate cancer by blocking male hormones and slowing cancer cell growth.

Minoxidil effectively lowers blood pressure and initially increases plasma renin activity without raising aldosterone levels.

New treatments for enlarged prostate are being developed, some of which may be more effective than current medications.

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.

Substances from dental stem cells might help treat hair loss.

Nandrolone and oxandrolone could help treat male health issues like muscle loss and low testosterone.

Wnt proteins from certain skin cells are crucial for normal hair growth and renewal.

Nutrients like vitamins, copper, zinc, and amino acids are crucial for healthy hair and wool growth.

Melatonin stimulates the skin components of ram's scrotum during their non-breeding season.

Valproic acid increases the risk of hair loss more than other drugs, especially in migraine patients, and lamotrigine may be a safer alternative.

Understanding hair biology is key to developing better treatments for hair and scalp issues.

Certain gene variations are linked to higher male hormone levels in Chinese women with PCOS and insulin resistance.

Putting α-methylspermidine on mouse skin can start hair growth.