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Hair's structure and properties change with pH; acidic pH maintains strength and less swelling, while alkaline pH increases water content and swelling.

Human hair provides more UV protection when aligned and at higher angles, but the scalp still gets UV exposure.

Activating Nrf2 protects human hair follicles from oxidative stress and helps prevent hair growth inhibition.

Tiny pollution particles called PM2.5 can harm skin cells by causing stress, damage to cell parts, and cell death.

Defective mitochondrial DNA replication causes aging symptoms and increased oxidative damage in mice.

Honokiol helps protect skin from damage and aging caused by cigarette smoke.

Heat damages hair, with Asian hair losing more protein than Caucasian hair.

Explosions don't stop hair proteins from being used to identify people.

Chamomile extract can protect hair from damage caused by light.

Hair can't be reliably repaired once damaged; prevention and proper product use are key to maintaining hair health.

Araliadiol protects skin cells from damage by boosting antioxidant defenses.

Herbal medicines need strict quality control to ensure safety and authenticity.

Using radiation to make mice's hair turn gray helps study and find ways to prevent or reverse hair graying.

Triptolide effectively and safely reduces actinic keratosis lesions in mice.

Sunlight and chemical treatments change hair's internal structure differently, needing specific care.

Maintaining DNA integrity in stem cells is crucial to prevent aging and cancer.

We don't fully understand how sunlight damages different types of hair.

Damage to skin releases dsRNA, which activates TLR3 and helps in skin and hair follicle regeneration.

Testosterone reduces heart damage and inflammation after injury.

Using an enzyme and keratin treatment can significantly repair and strengthen damaged hair.

16-MHA can restore the barrier and moisture of damaged hair, making it similar to undamaged hair.

Copper and iron cause keratin damage in hair by converting methionine to homocysteine.

The method accurately measures hair damage and strength, revealing effects of cosmetics and metal correlations.

Cosmetic procedures can harm hair, but damage can be minimized with knowledge and care; however, once hair is damaged, it cannot be reliably repaired.

Putting thymidine dinucleotide on newborn mice's skin can delay and reduce skin cancer.

Sappan wood hair tonic helps protect and repair damaged hair.

ATP increases melanin production in skin after UV exposure, with the P2X7 receptor being crucial for this process.

Alpha Lipoic Acid helps protect skin from smoking damage.

Melatonin may benefit skin health and could be a promising treatment in dermatology.

Rosehip oil reduces wrinkles and UV spots and may have antimicrobial benefits.