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Dye enters hair at the edges of cuticle cells and penetrates more from water than alcohol-based solutions.

Glutamine metabolism affects hair stem cell maintenance and their ability to change back to stem cells.

Melatonin implants and long daylight hours alter the timing of hormone release and hair growth in mouflon sheep.

Red Ginseng Extract may help human hair grow by activating growth pathways and blocking negative effects of certain hormones.

THCCOOH levels in hair decrease from root to tip and don't match well with self-reported cannabis use.

The Cross-section Trichometer is a new tool that can measure hair quantity and detect hair loss and growth.

Zinc therapy improved hair health in a girl with acrodermatitis enteropathica.

First-episode psychosis patients have higher hair cortisol levels, indicating early stress response issues.

Thermal hair straightening changes drug levels in hair, affecting test results.

Pigs in farrowing crates and loose-housing systems showed no difference in chronic stress levels as measured by hair cortisol.

The hair of two ancient Chilean mummies is well-preserved and contains high levels of heavy metals.

Higher hair calcium to magnesium ratios and lower chromium levels in hair may indicate insulin resistance in Korean men.

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

A new method was created to measure metformin in hair, showing potential for monitoring treatment and medical investigations.

Hair can be used to measure cancer-related chemicals noninvasively.

Hair can absorb and transfer opiates when soaked in water, with damaged hair absorbing more.

The study found new details about human hair growth and suggests that preventing a specific biological pathway could potentially treat hair graying.

A new method accurately measures steroid hormones in a few hair strands and could help study chronic stress and hair loss.

Moving horses to new places can increase their stress levels, as shown by higher stress hormone in their hair.

Hair cortisol could be a marker for chronic stress in pregnancy, but depression affects cortisol levels differently.

The conclusion is that a new method to measure hair shine was confirmed to match people's visual assessments.

Mixed-race individuals have hair with varied shapes and more root damage.

A new automated method accurately measures hair damage using microscopic images.

Korean and Caucasian men with male pattern baldness have different hair steroid levels.

The method effectively analyzes human hair proteins, especially nonfilamentous ones.

HHORSC exosomes and PL improve hair growth treatment outcomes.

The study did not conclude whether hair can reliably indicate kidney stones, cholelithiasis, hypertension, or diabetes.

Henna dye improves hair cuticle and thickness but effects vary by hair type and health.

Conditioners in hair dye reduce damage and improve combability.

Chemical hair straightening significantly reduces detectable drug levels in hair.