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

Red light therapy is safe and effectively increases hair growth in women with hair loss.

African hair is curled, Asian hair is thick, European hair is lighter, and chemical methods help identify hair color differences.

Cortisone in hair is a more reliable indicator of stress hormone exposure than cortisol.

A method was developed to grow millions of hair cells from a single hair for research and storage.

mTORC1 activity is important for hair growth and color, and targeting it could help treat hair loss and greying.

Beard hair follicles have more androgen receptors than non-balding scalp hair follicles.

Narasoo shampoo and tonic improved scalp and hair health without safety issues, but more research is needed.

Hair and nails can show long-term changes in lead and calcium levels.

Skin-derived stem cells grow faster and are easier to obtain than hair follicle stem cells, but both can become various cell types.

Red light therapy at 655 nm significantly improved hair growth in men with hair loss.

The research provides specific measurements for hair follicles that can improve hair transplant and regeneration techniques.

The conclusion is that exogen is a unique hair cycle phase and the new sampling method specifically targets this stage, which may help in future hair loss research.

Stem cells are key for hair follicle recovery.

Scalp hair follicle microbes affect hair health and could be used for treatments.

Studying hair roots can help diagnose hair diseases and guide treatments.

Melanin density affects hair color, and this method can help in cosmetic assessments and diagnosing hair diseases.

IL-15 helps hair grow longer and stronger by extending the growth phase and reducing cell death.

The scalp has more diverse bacteria, while hair has more bacteria and unique types.

Hair levels of estradiol and progesterone are higher in premenopausal than postmenopausal women, but the difference isn't statistically significant, indicating the need for a better measurement method.

The medulla in Asian scalp hair has a tubular structure that allows ions and large molecules to flow through it.

Microscopic hair analysis is important in forensics but has limitations; new technologies are improving its accuracy.

Male and female scalp hair differ in size, density, length, curliness, pigmentation, and cuticle preservation.

Bacterial communities on scalp hair are unique to each person but consistent across different scalp sites.

Hair products with copper and zinc enriched yeast made hair thicker and denser.

Surgical stress temporarily changes hair fiber dimensions, returning to normal after four weeks.

Balding scalps slow down hair growth.

Older women's scalp cells show changes that could contribute to hair thinning.

Melanocytes in the outer root sheath are likely stem cells that grow fast but stay immature.

Not eating enough protein can cause hair roots to shrink and lose color, and hair to become thinner.