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This chapter reviews the anatomy and structure of hair, discusses hair damage and analyses, and explores methods for processing hair changes, but presents no new research findings.

This chapter reviews patchy hair loss due to skin disease, nail disorders related to chronic trauma, and treatments for small carcinomas, but it reports no new clinical findings.

This article discusses the characteristics of human hair, its damaging processes, and the potential repair effects of immuno-cosmeceuticals, but it reports no new clinical results.

This article reviews common causes of hair loss and hair excess and discusses their management in primary care settings, but it reports no new clinical results.

Twisting hair weakens it, but strength can be recovered at low twist levels.

This narrative review found that combined oral contraceptives remain the primary treatment for hirsutism and acne in women with PCOS, but highlighted the need for further research to refine therapeutic options given the variable efficacy and emerging treatments like GLP-1 receptor agonists.

This review explores the potential of herbal therapies and modern delivery methods for managing premature hair greying, highlighting promising plant-based treatments and emphasizing the need for clinical trials to validate their effectiveness.

In this study of Danioninae species, researchers reported that the presence of breeding tubercles on the pectoral fins is conserved in certain species and linked to local androgen conversion, with steroid 5-α-reductase playing a crucial role in their development.

This review highlights the various causes and treatment options for alopecia, noting that while non-scarring types often see successful hair regrowth, scarring forms require early intervention to manage inflammatory destruction of hair follicles.

This Delphi consensus study provides expert insights into hair aging, aims to enhance diagnostic precision and management of age-related hair changes, and identifies possible new therapeutic targets.

In this study, BTP-loaded solid lipid nanoparticles were developed and shown to protect hair from heat-induced damage by enhancing cuticle integrity and thermal resistance in simulated thermal straightening conditions.

Natural products might help treat hair greying.

This study reviews natural hair and scalp care methods, highlighting the importance of plant-derived ingredients and scalp type diagnostics for effective trichological management and optimal hair health.

This study highlights the importance of creating customized, evidence-based hair care solutions by considering scalp types and environmental factors, confirming the effectiveness of multidisciplinary approaches integrating dermatology, cosmetology, and trichology to develop safe and efficient products and treatments.

This review explores hirsutism in women with PCOS, analyzing its pathophysiology and management through both modern medicine and Unani perspectives, and suggests combining these approaches for more holistic care, while calling for future research to enhance treatment efficacy and safety.

In this literature review, potential health risks of toxic chemicals commonly found in cosmetic products were linked to issues such as cancer, reproductive abnormalities, and skin diseases, highlighting concerns over ingredients like talc, parabens, and phthalates.

In this study, researchers developed and assessed two polyherbal hair tonic formulations, finding that Hair Tonic A containing 10% white tea extract improved hair thickness, manageability, and anti-frizz properties, particularly for blonde and black hair, while demonstrating greater stability compared to Hair Tonic B.

This review discusses the etiology, diagnosis, and management of polycystic ovary syndrome and reports no new clinical findings.

This study found that hair with lower levels of keratin associated proteins reduced the foreign body response in mouse subcutaneous implant tests compared to hair with higher keratin levels.

In their review, the authors discussed the increasing issue of allergies to hair products, highlighting common allergens such as hair dyes and topical minoxidil, and outlined diagnostic methods and alternatives for those affected, particularly addressing higher risks among hairdressers due to professional exposure.

This paper reviews various techniques for measuring the physical and mechanical properties of human hair fibers, emphasizing their importance in developing effective cosmetic products.

In this study, low-dose oral minoxidil was found to have a favorable safety profile for treating alopecia, with mostly mild side effects, in both general and hypertensive populations.

In this study, researchers used scanning electron microscopy to analyze hair damage from 3% hydrogen peroxide and UVB radiation, observing that Caesalpinia sappan hair tonic formulations coated and interacted with the hair cuticle, potentially modifying hair fiber damage.

This study found that after using Mintop Shampoo for 10 wash cycles, significant improvements in hair detangling, combability, static reduction, shine, softness, smoothness, bounce, tensile strength, and percentage elongation were observed compared to the initial damaged state.

Bee pollen, green tea, essential oils, and various plant extracts improve skin and hair health.

In this review paper, the authors explored the composition and role of lipids in human hair, highlighting their importance for hair texture, moisture retention, and tensile strength, while noting that the understanding of hair lipids' functions remains controversial and requires further research.

This study found that combining letrozole with metformin was more effective at inducing pregnancy in women with PCOS compared to letrozole alone, while OCP and metformin significantly improved menstrual regularity and reduced hyperandrogenic symptoms.

In this study, PCOS was found to be highly prevalent among urban, middle socioeconomic status women aged 21 to 30, with common symptoms including oligomenorrhea, weight gain, infertility, hirsutism, and acne.

Home photobiomodulation therapy can improve life quality and mobility for disabled individuals.

This study found that microplastics on the Lebanese Mediterranean coast transport various organic and inorganic pollutants, posing threats to marine organisms and potentially human health.