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Different sizes of keratin peptides can strengthen hair, with smaller ones possibly increasing volume and larger ones repairing damage.

Different oils affect hair flexibility and strength, with their impact varying on whether hair is virgin or bleached.

Neonate scalp hair is thinner, lacks a medulla, and has smaller follicles compared to adult hair.

Hair growth is controlled by specific gene clusters and proteins, and cysteine affects hair gene expression in sheep.

Human hair keratin fibers have a detailed nano-scale structure that changes with different conditions.

Hair lipids do not protect against humidity.

Some mutant mice have hair with abnormal cross-linking, mainly in the cuticle, not affecting other hair parts.

Gut microbes significantly affect brain steroid levels.

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

Human hair can almost fully recover its structure within about 1,000 minutes after being stretched.

Eating glucoraphanin can help prevent psychosis in offspring whose mothers had immune system activation.

The enzyme 5α-reductase is key in causing psychotic-like effects from sleep deprivation.

White hair has less lipid content and absorbs water differently than brown hair.

Low-molecular weight hyaluronate can make damaged hair stronger.

VEGFR-2 activation is likely involved in hair follicle growth, survival, and development.

The modified staining method can determine the ABO blood group of hair samples accurately.

An extract from Quercus acutissima bark was found to reduce sebum production and block an enzyme linked to acne.

The B2 genes are crucial for hair growth in rats.

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

Hair color is determined by melanin and can be affected by genetic conditions like albinism.

A cluster of sulfur-rich hair protein genes was found on chromosome 17.

Human beard hair medulla contains a unique and complex mix of keratins not found in other human tissues.

Stress worsens Tourette symptoms by increasing allopregnanolone levels.

Ziehl-Neelsen's stain helps identify different parts of hair in sheep and goats.

African hair has the most lipids, while Caucasian hair is more hydrated and stronger.

Hair care products mainly work on the hair's surface and need professional guidance for use.

β-Catenin signaling is involved in brain cell growth after injury and could be a therapy target.

Prenatal stress changes how male and female rats enjoy rewards differently, linked to sex hormones.

A teenager's hair with alternating white and dark bands, known as Pili annulati, is a genetic condition that is usually harmless and often considered attractive.

Trichothiodystrophy hair is structurally abnormal with protein and organization issues.