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Metabolic disorders can cause hair structure defects and growth issues, but amino acid levels in hair remain normal.

Hair density and thickness decrease in all scalp areas for East Asians with AGA.

The new human placental extract may help prevent hair graying and reduce nerve pain from chemotherapy.

Hair selenium levels can indicate nutritional status in very old people.

Monilethrix is a genetic hair disorder causing fragile, beaded hair with no effective treatment.

Children with marasmus have more resting hair follicles and thinner, less pigmented hair, showing long-term malnutrition.

Measuring cortisol in hair helps understand stress and manage related health issues.

The 60-second timed hair count is a reliable and simple way to measure hair shedding at home, showing older women tend to shed more hair than younger women.

Healthy scalp reduces hair loss by managing oxidative stress.

Chronic hair diseases can severely affect mental health and self-confidence.

Human hair provides more UV protection when aligned and at higher angles, but the scalp still gets UV exposure.

Thorough hair examination is crucial for accurate diagnosis and treatment.

Hairless protein and putrescine regulate each other, affecting hair growth and skin balance.

Pulling 2 or fewer hairs is normal for all hair types, including Afro- and Asian-textured hair.

Hair loss negatively affects self-esteem and social interactions, but people use coping strategies like wigs or shaving to manage it.

Oxidative dyes damage hair more than semi-permanent dyes, but new technologies help protect hair while coloring.

Hair regrowth slows with age due to changes in enzyme activity.

Hair color and length affect metabolite profiles in hair, so they should be considered in hair analysis.

Hair loss is common in the studied community, often linked to aging and hair care practices like braids, weaves, and chemical relaxers.

Iron deficiency might be linked to hair loss, but more research is needed.

People often have negative attitudes toward those with alopecia, especially if it's severe or seen as a medical issue.

Feminizing hormone therapy increases hair counts and improves hair-related quality of life, while masculinizing therapy may reduce large terminal hairs.

Women with hair loss have weaker hair that breaks more easily.

Human hair has bipolar electrical charges because of a gap in the hair follicle's electromagnetic field.

Human hair loss may have evolved to help increase brain size.

Chemotherapy caused the patient's hair to have alternating thick and thin segments.

Mixed-race individuals have hair with varied shapes and more root damage.

The document suggests that the traditional understanding of hair growth cycles and alopecia may be inaccurate and that blood supply plays a significant role in hair growth and loss.

Hormones and neuroendocrine factors control hair growth and color, and more research could lead to new hair treatment options.