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Human hair's ability to get wet is complex and can change with treatments, damage, and environment.

Hair ages as the cuticle wears down, especially beyond 1 meter from the root, affecting its strength and shine.

Hair bleaching causes significant damage to hair and skin.

Hair has unevenly distributed proteins and lipids, with lipids mainly in the cuticle and proteins in the cortex and medulla.

Melanin in black hair protects it from sun damage better than light-brown hair.

Hair is mostly made of three protein types: helical, high-sulfur, and high-tyrosine.

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.

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.

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.

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

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

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.

TA-Ado effectively promotes hair growth and reduces hair loss.