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Hair follicle cells become four types: medulla, cortex, cuticle, and inner root sheath.

OCT can identify hair structures, but chemical treatments can damage them.

Sunlight damages hair, causing cuticle loss, protein changes, and discoloration.

Chemical and physical treatments like bleaching, dyeing, and UV radiation damage both Caucasian and Afro-ethnic hair.

Hair coloring increases copper and calcium uptake, damaging hair and reducing shine.

Curly hair breaks due to mechanical damage and environmental factors, not chemical makeup, and needs ongoing care to prevent breakage.

Hair properties vary with age and ethnic origin.

The conclusion is that substances can penetrate hair fibers through multiple pathways, including both the cell membrane complex and the non-keratinous parts.

Hair proteins change location and structure as hair cells mature.

The torsional method effectively evaluates hair damage and the performance of hair care ingredients.

The evolution of mammal body hair remains a mystery.

Hydrogenated palm oil repairs and conditions damaged hair by preventing swelling.

Calcium soaps are present in human hair and can be removed with acid.

Small amounts of DNA can be found in the hair shaft, especially near the root, but it decreases with hair treatments and washing.

Gray hair has more continuous medullation and a higher medullary diameter than black hair.

Titanium nanoparticles may trigger frontal fibrosing alopecia, so avoid products with them.

Alkaline hair relaxers damage hair, but cationic and non-ionic polymers can help reduce this damage.

Older thin hair is not just thinner but also has different shape, structure, and stiffness.

Keratin essence protects and improves damaged hair.

Two patients with the same genetic mutation had both blistering skin and easily pulled out hair.

Trichohyalin and peptidylarginine deiminase type III are found together in rat hair follicles, with trichohyalin being modified after expression.

Hair-coating shampoos dye better initially, but hair-oxidation shampoos keep color longer and may damage hair more.

Hair analysis can detect drug use but is costly and interpretation is complex.

Male and female human hairs have different microscopic structures that can help in forensic analysis.

Scientists made human hair magnetic by coating it with special nanoparticles.

The nanocomplex protects hair from UV damage and strengthens it.

Riboflavin and blue light speed up genipin hair dye, making it fast, glossy, stable, and eco-friendly.

Placenderm® improves scalp elasticity and hair quality safely.

Small KP peptide improves hair without reducing agents, while larger proteins need them for better results.

Riboflavin with blue light speeds up hair dyeing, making it faster, safer, and long-lasting with less hair damage.