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Choline and biotin are important for liver health and preventing certain deficiencies in animals, and more research is needed to understand their benefits in humans.

Oxidative stress causes hair to gray by damaging and killing pigment cells.

Women's hair gets thinner and grayer as they age, with treatments available for hair loss and graying.

Circadian clock genes are important for hair growth and may affect aging-related hair loss and graying.

Hair follicle cells age faster and lose pigment due to less catalase, causing hair to turn gray.

Early hair whitening may indicate a higher risk of heart disease in young and middle-aged men.

An 81-year-old man's white hair began to regain its original color while he was treated with lenalidomide, suggesting that graying hair might be reversible.

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.

Stress does not greatly speed up aging or hair loss in politicians.

The document concludes that protecting skin from the sun, avoiding smoking, and using treatments like Minoxidil and Finasteride can help manage skin and hair aging.

The document explains how hair is studied in forensics to identify its source and its role in criminal investigations.

Melanoma development can be linked to the breakdown of skin's melanin-producing units.

Hair follicle studies suggest that maintaining telomere length could help treat hair loss and graying, but it's uncertain if mouse results apply to humans.

Hair aging is caused by stress, hormones, inflammation, and DNA damage affecting hair growth and color.

Some skin problems can be signs of diabetes or other metabolic diseases and recognizing them can help diagnose and treat these diseases early.

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

Hair color is determined by melanin produced and transferred in hair follicles.

IVIg treatment improved symptoms but caused permanent dark hair loss.

People distressed by minor skin changes should consult dermatologists with cosmetic expertise, and a public Cosmetic Dermatology Service with mental health support is recommended.

Marie Antoinette syndrome causes sudden hair whitening, but its exact cause is unknown.

Hair diversity is influenced by complex genetics and environmental factors, requiring more research for practical solutions.

Foxp1 helps control hair stem cell growth and response to stress during hair growth cycles.

The document concludes that more research is needed to understand hair loss in men and to find new treatments.

Certain genes control the color of human hair by affecting pigment production.

c-kit affects hair growth and color in alopecia areata and androgenetic alopecia.

Oxidative stress damages hair and contributes to aging, and managing it can help maintain hair health.

Hair color is determined by different melanins and changes with age.

Activating Nrf2 protects human hair follicles from oxidative stress and helps prevent hair growth inhibition.

Capsaicin, found in chili peppers, can slow down hair growth by affecting skin cells and hair follicles.

Hair loss in elderly women is often caused by various factors, including hormonal changes after menopause.