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Redheaded people have higher levels of a vitamin D precursor, suggesting red hair may be an adaptation for better vitamin D synthesis in areas with less sunlight.

Females have higher estrogen receptor levels in hair than males, and these levels decrease in white hair compared to black hair.

Lasers have become safer and more effective for treating skin problems and hair removal.

Vitamin D deficiency is common in people with certain types of hair loss, like alopecia areata and female pattern hair loss.

The human scalp has different types of pigment cells in hair follicles with varying abilities to produce pigment.

Androgenetic alopecia is a common hair loss condition caused by testosterone effects on hair follicles, leading to thinner, shorter, and less pigmented hair, diagnosed using scalp dermoscopy and treated with topical minoxidil, antiandrogen agents, and 5-alpha reductase inhibitors.

Caffeine can protect scalp hair follicles from damage caused by UV radiation.

Human hair shows promise for non-invasive medical testing, but more research is needed to standardize its use.

Heat stress changes goats' skin and hair at the microscopic level and affects their genes and skin bacteria.

Patients on long-term hemodialysis often have skin problems related to their treatment.

Stress can worsen skin conditions by affecting hormone levels and immune response.

Most young men with early gray hair have low vitamin D but normal iron levels.

Certain gene variations and different levels of BDNF and CRH hormones are linked to vitiligo.

Hair analysis can't determine ponies' calcium and phosphorus levels; use soil and feed tests instead.

Heavily hunted wolves have higher stress and reproductive hormone levels.

Researchers identified potential markers for human hair color stem cells.

Hirsutism is often caused by high male hormone levels and can be treated with lifestyle changes and medications.

Cosmetic hair treatments can increase hair testosterone levels, while natural hair color does not affect it.

Dexamethasone affects hair growth by altering levels of proteins that either promote or inhibit hair follicle growth.

Hair texture changes with age due to varying levels of lipids.

People with first-time vitiligo have lower levels of a certain brain protein compared to healthy individuals.

Kids with early graying hair often have low levels of calcium, ferritin, and vitamin D3.

Men with less sun-sensitive skin have lower PSA levels, while men with more sun-sensitive skin have higher PSA levels.

Young Indians with premature graying often have lower levels of certain nutrients and unhealthy lifestyles.

People with early graying hair often have lower levels of iron, ferritin, and calcium.

Women losing hair might have lower levels of vitamin D.

Cosmetic treatments like bleaching and perming can greatly reduce opiate levels in hair, possibly leading to false-negative drug tests.

The study concluded that low iron and vitamin D levels in women might play a role in chronic hair loss, despite no significant difference between those with and without hair loss.

Finasteride affects hair growth by changing caspase and XIAP levels, potentially treating hair diseases.

New treatments for PCOS focus on insulin resistance and reducing testosterone levels, along with traditional hormone therapies.