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More research is needed to understand hair and scalp disorders in people with skin of color.

Hair amino acid levels can indicate metabolic disorders.

Two sisters have rare hair disorders causing short, fragile, kinky hair.

Ultraviolet rays damage hair, smoking may cause hair loss, and good nutrition is important for hair health, but genetics mainly decide hair thickness.

Women find hair loss more distressing than men and often underestimate it, needing more public awareness and professional support.

Hair has unevenly distributed proteins and lipids, with lipids mainly in the cuticle and proteins in the cortex and medulla.

Focus on preserving hair follicle health to prevent hair loss and maintain hair quality.

Aging alone barely affects the number of hair follicles, meaning hair loss is minimal without other conditions like androgenetic alopecia.

Redheaded people have higher levels of vitamin D precursor, suggesting their hair color may be an adaptation to low sunlight areas.

Human hair growth involves active, resting, and intermediate phases, and examining plucked hairs can teach students about hair biology and diseases.