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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.

Human hair has a new region with ordered filaments and the cuticle contains β-keratin sheets.

Chemotherapy causes hair loss starting soon after treatment begins and recovers about 3 months after ending, while tamoxifen does not significantly affect hair growth.

Light microscopy is useful for diagnosing different hair disorders.

Hair dyes can change hair color temporarily or permanently but may cause side effects like skin reactions and hair damage.

Certain molecules in hair change with age and could be used for cosmetic treatments.

Hes1 protein is important for hair growth and regeneration, and could be a potential treatment for hair loss.

Ruby laser hair removal significantly reduces hair density.

Poor maternal nutrition can lead to fewer wool follicles in Chinese Merino sheep.

The type 3 IP3 receptor is important for controlling hair loss and growth.

Human hair follicles can regenerate and recover after severe injury by going through a brief abnormal resting phase before growing again.

Antler velvet hair and body hair of red deer have different structures that help with protection and insulation.