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Caucasian women's hair appears thickest in their 20s, with perceived thinning after mid-30s due to both decreasing density and diameter.

Spermidine may help reduce hair loss and deserves further testing as a treatment.

Exosomes from human skin cells can stimulate hair growth and could potentially be used for treating hair loss.

Hair loss can indicate underlying systemic diseases and addressing these can sometimes reverse the hair loss.

Vitamin D receptor is crucial for starting hair growth after birth.

Hair follicles grow hair and release it through the skin.

Children's hair grows in different types from before birth through puberty, with growth rates and characteristics varying by age, sex, and race.

Prolactin and melatonin can stimulate hair growth in Cashmere goat hair follicles, but melatonin may reduce follicle viability over time.

miR-218-5p helps skin and hair growth by targeting SFRP2 and activating a specific signaling pathway.

UVB radiation harms hair growth and health, causing cell death and other changes in human hair follicles.

Adipose-derived stem cells can help treat hair loss.

Estrogens generally inhibit hair growth and improve skin quality, but their exact effects on hair follicles are complex and not fully understood.

Valproic acid may help hair grow and could be a safe treatment for hair loss.

Scientists created a gel with nanoparticles to deliver medicine to hair follicles effectively.

People with late-stage HIV-1 often experience a specific type of hair loss linked to multiple factors, including nutritional issues and immune responses.

The effects of estrogen on human hair growth are unclear and need more research.

Trichoscopy is good for diagnosing and monitoring hair and scalp problems in children but needs more research for certain conditions.

All three shampoos reduced dandruff and hair loss, but ketoconazole and piroctone olamine also made hair thicker.

Nanotechnology improves hair care products by enhancing ingredient stability, targeting treatment, and reducing side effects, but more research on its toxicity is needed.

3,4,5-tri-O-caffeoylquinic acid promotes hair growth by activating the β-catenin pathway.

Researchers found a way to create cells from stem cells that act like human cells important for hair growth and could be used for hair regeneration treatments.

Better hair care products are needed to protect against grooming and chemical damage.

Permanent hair dye damages hair but it mostly recovers after 8 weeks; using certain hair care products can help repair it.

Nanotube-based hair treatments could improve hair health and growth, and offer long-lasting effects.

Recent progress has been made in understanding inherited hair and nail disorders.

Minoxidil stimulates hair growth by increasing hair thickness and prolonging growth phase.

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

Mice with the 'lanceolate hair' mutation have abnormal hair and skin similar to human Netherton's syndrome.

Vitamin C derivative helps hair grow longer by making cells produce a growth factor through a specific cellular pathway.

A long-acting Vitamin C derivative helps hair grow by stimulating cells and increasing growth factors.