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Hair ages due to genetics and environmental factors, leading to graying and thinning, with treatments available for some conditions.

Estrogens can improve skin aging but carry risks; more research is needed on safer treatments.

Asian hair is stronger and more damage-resistant than Caucasian hair due to a thicker cuticle layer.

Telogen Effluvium is a condition causing excessive hair loss due to stress, illness, drugs, or hormonal changes, and can be treated with specific products or naturally resolves after 3-4 years.

A 17-year-old girl had severe, on-and-off hair loss, likely due to COVID-19. She was treated with Vitamin D3, biotin, and other supplements, and saw some improvement within a month.

Dyes can penetrate human skin and hair follicles up to 1.2 mm deep and the sebaceous gland can store dye; Indocyanine Green lotion was made for safe dyeing and monitoring.

Hair treatments and dehydration affect hair's lipid and protein behavior, influencing its flexibility and appearance.

Sex hormones affect hair growth and loss, and treatments for related hair diseases include various medications, hair transplantation, and light therapy.

The serum effectively promotes hair growth and reduces gray hair without side effects.

Cosmetic procedures can harm hair, but damage can be minimized with knowledge and care; however, once hair is damaged, it cannot be reliably repaired.

A dark-haired Chinese girl had hair that looked banded under certain light but was normal under a microscope.

Removing β-catenin in certain stem cells causes hair whitening and pigmentation issues.

Special cell particles from macrophages can help hair grow.

Piperine from black pepper can make hair less oily by blocking fat cell development in hair roots.

Mouse stem cells from hair follicles can improve wound healing and reduce scarring.

Non-scarring hair loss is common in lupus patients and can be diagnosed with specific hair and tissue tests.

Constant light exposure during pregnancy changes newborn rabbits' skin, affecting hair follicles, skin thickness, and pigment cells.

A 3-month stay in space causes skin thinning, disrupts hair growth, and changes muscle-related genes in mice.

Cow placenta extract may help hair grow by increasing a growth factor but is less effective than minoxidil.

Tigason improved hair growth in a boy with monilethrix without side effects.

The most common cause of hair loss in children is tinea capitis, followed by alopecia areata and telogen effluvium.

Pulsed-intense light can significantly reduce hair, with effectiveness depending on treatment number and timing, and has mild side effects.

HtrA2 activity is crucial for normal hair growth by regulating fat cell development.

Greasy hair spreads sebum twice as much as nongreasy hair over time.

Different fields of expertise must work together to better understand hair growth and create effective hair loss treatments.

Angora goat hair grows faster and produces more protein than cashmere goat hair, and certain hormones and nutrients positively affect hair growth and protein synthesis.

Hair transplantation in East Asians needs special techniques to ensure natural results and prevent complications due to their unique hair and scalp characteristics.

Certain gene variations are linked to the thickness of cashmere goat hair.

Mice lacking a key DNA methylation enzyme in skin cells have a lower chance of activating stem cells necessary for hair growth, leading to progressive hair loss.

Hair follicle regeneration in skin grafts may be possible using stem cells and tissue engineering.