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Hair growth is influenced by interactions between skin layers, growth factors, and hormones, but the exact mechanisms are not fully understood.

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

Minoxidil helps grow longer, thicker hair in bald scalps of stumptailed macaques, and early treatment is more effective.

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.

Premature hair graying in young men is linked to family history, obesity, and smoking.

Hair problems can be caused by genetics or the environment, and treatment should focus on the cause and reducing hair damage.

Hair follicle regeneration possible, more research needed.

Heparan sulfate is important for hair growth, preventing new hair formation in mature skin, and controlling oil gland development.

Hair growth is influenced by various body and external factors, and neighboring hairs communicate to synchronize regeneration.

Bone marrow and umbilical cord stem cells can help grow new hair.

Hormones, nutrition, and seasonal changes regulate hair growth cycles, with androgens extending growth phases and factors like aging and malnutrition affecting hair loss and thinning.

Men's hair loss is caused by hormones and genes, and can be treated with medication and surgery, while graying is due to aging and has no prevention except dyeing.

Oestrogen and thyrotropin-releasing hormone affect prolactin and its receptor in human skin and hair, suggesting new treatment options for related conditions.

Use finasteride, dutasteride, and minoxidil for hair loss treatment.

The normal range for the hair pull test is 2 hairs or fewer, and washing or brushing hair before the test does not affect the results.

Bleaching hair removes its protective top layer and exposes more hydrophilic groups, changing its chemical surface and affecting how it interacts with products.

Finasteride significantly improves hair growth but may cause sexual side effects.

Menopause affects hair and skin; more research needed for treatment.

Loose anagen hair syndrome is caused by structural abnormalities in the hair follicle's inner root sheath.

Minoxidil nanoparticles can potentially be a more effective treatment for hair growth than current treatments.

Further research is needed to improve hair regeneration using stem cells and nanomaterials.

Undariopsis peterseniana extract helps hair grow by activating certain cell growth pathways and could be a new treatment for hair loss.

Researchers created a 3D hydrogel that mimics human hair follicles, which may help with hair loss treatments.

Common Black hair care products may affect hormone levels and potentially impact health, especially in reproductive and metabolic areas.

Key genes regulate hair follicle phase changes in Inner Mongolia cashmere goats.

African American women report more hair issues and use different hair care practices than Caucasian women, and have different hair and scalp characteristics.

Crataegus pinnatifida extract may help increase hair growth and thickness in mice.

Laser and light treatments can effectively remove hair long-term.

Macrophage-stimulating protein helps hair grow and can start hair growth phase in mice and human hair samples.