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Advanced therapies like gene, cell, and tissue engineering show promise for hair regrowth in alopecia, but their safety and effectiveness need more verification.

Biopolymers are increasingly used in cosmetics for their non-toxicity and skin benefits, with future biotech advancements likely to expand their applications.

Repeated hair dyeing significantly damages hair.

The article concludes that advancements in hair cosmetics require dermatologists to stay informed about products and their potential risks, including allergies and higher risks for hairdressers.

Understanding hair biology is key to developing better treatments for hair and scalp issues.

Permanent hair dyes use chemicals that react with hydrogen peroxide to create color.

Bleaching damages hair by reducing the quality of keratin and keratin-associated proteins.

The document concludes that hair is complex, with a detailed growth cycle, structure, and clinical importance, affecting various scientific and medical fields.

Hair and nails are skin parts that develop early and serve protective and functional roles.

Enzymes called PADIs play a key role in hair growth and loss.

EGFR helps control how hair grows and forms without needing p53 protein.

In vivo reflectance confocal microscopy is useful for evaluating hair shaft diseases but needs improvement for deeper hair follicle issues.

Animal models, especially mice, are essential for advancing hair loss research and treatment.

Some chemicals and drugs can cause hair loss, which usually grows back after stopping the treatment.

Women's hair grows faster and thicker than men's, but hair growth slows for both genders with pattern hair loss.

Using polyethylenimine-DNA to deliver the hTERT gene can stimulate hair growth and may be useful in treating hair loss, but there could be potential cancer risks.

Hair and nail cells share similar proteins, indicating a common differentiation pathway.

Hair growth is influenced by hormones and goes through different phases; androgens can both promote and inhibit hair growth depending on the body area.

Hair care products are important for appearance and self-esteem, and choosing the right ones can help maintain healthy hair.

Cysteine-rich keratins evolved independently in mammals, reptiles, and birds for hard skin structures like hair, claws, and feathers.

The research found that postmortem root bands in hair are likely caused by the breakdown of a specific part of the hair's inner structure after death.

Hair absorbs molecules differently based on their size, charge, and love for water, and less at higher pH; this can help make better hair products.

AP collagen peptides improve hair elasticity and gloss.

Human hair varies widely and should be classified by curl type rather than race.

UV radiation damages hair by creating holes and peeling cuticle layers.

Androgens can cause hair growth in some areas and hair loss on the scalp.

Quercetin-loaded nanoparticles protect human hair from UV-B damage.

Mouse hair follicle cells briefly grow during the early hair growth phase, showing that these cells are important for starting the hair cycle.

Baby teeth stem cells can help grow hair in mice.

Skin and hair renewal is maintained by both fast and slow cycling stem cells, with hair regrowth primarily driven by specific stem cells in the hair follicle bulge. These cells can also help heal wounds and potentially treat hair loss.