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Topical products, especially specific shampoos, are effective in treating androgenetic alopecia by delivering active ingredients to hair follicles and improving hair quality.

Some plant-based chemicals may help with hair growth, but more research is needed to confirm their effectiveness.

The article concludes that developing in vitro models for human hair structures is important for research and reducing animal testing, but there are challenges like obtaining suitable samples and the models' limitations.

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

Solute binding to hair keratin is mainly driven by hydrophobic interactions and changes with pH.

Nutricosmetics with active ingredients can help with hair loss and improve hair growth.

Polydopamine is a safe, effective, and permanent hair dye that turns gray hair black in one hour.

Collagen peptides from marine and bovine sources may help prevent hair loss by affecting hair follicle stem cells differently.

Coloring shampoos for gray hair may cause gene mutation, reproductive issues, and skin damage, needing stricter regulation and expert consultation.

The book provides detailed information on natural ingredients in beauty products and emphasizes the need for more human trials to confirm their effectiveness.

New treatment reduces hair shedding and increases hair density in women with early hair loss.

Scientists created a lab-grown hair follicle model that behaves like real hair and could improve hair loss treatment research.

Herbs can potentially treat hair loss by inhibiting a key enzyme and promoting hair growth, and deficiencies in zinc, biotin, and iron are linked to hair loss.

Chemical hair straightening improves smoothness and shine but may cause side effects, suggesting a need for safer methods.

The 3D structure of a key hair protein was modeled, revealing specific helical structures and stabilization features.

Grape seed oil improved hair quality the most, followed by rosehip and safflower seed oils, and reduced damage from shampoo.

Betamethasone activates and increases the growth of certain skin cells from hair follicles.

Nanocarrier-based treatments show promise for better hair growth in androgenetic alopecia but need more research.

Nanocrystals improve skin penetration and stability of caffeine, suggesting a new method for delivering similar substances through the skin.

All hair removal methods irritate underarm skin and cause dryness, with shaving being less irritating but more drying than plucking or waxing.

A new supplement may treat hair loss by targeting multiple causes like inflammation and stress.

Nanoparticles sized between 470 and 750 nm are best for delivering substances like caffeine into hair follicles for absorption.

Using growth factors with microneedling is effective for treating hair loss.

Improved methods create smaller, more effective gelatin nanoparticles for skin delivery, and new caffeine nanocrystals enhance absorption and effectiveness.

Microparticles help caffeic acid stay longer in hair follicles for better treatment of folliculitis.

Niacinamide does not promote hair growth.

Dermal Papilla cells are a promising tool for evaluating hair growth treatments.

Scientists created a gel with nanoparticles to deliver medicine to hair follicles effectively.

Excipients greatly affect how well curcumin nanocrystals penetrate the skin and target hair follicles.

Hair sunscreens are important for maintaining hair's cosmetic value.