23 citations
,
August 2019 in “Proceedings of the National Academy of Sciences of the United States of America” Pollution exposure speeds up hair damage.
27 citations
,
January 1995 Melanin in black hair protects it from sun damage better than light-brown hair.
6 citations
,
January 1997 in “Medical Mycology” The fungus Piedraia hortae damages hair by slowly breaking down its layers, leading to long-lasting infection.
February 2025 in “Brazilian Journal of Hair Health” The Brazilian candle flame technique can damage hair by melting the cuticle and exposing the cortex.
October 2024 in “UNESP Institutional Repository (São Paulo State University)” Straightening and dyeing damage hair structure.
October 2015 in “Cosmetic Dermatology” Hair straightening changes hair structure and can cause damage if done wrong, but improvements in the methods are expected to continue.
12 citations
,
July 2015 in “British journal of dermatology/British journal of dermatology, Supplement” Curly hair breaks due to mechanical damage and environmental factors, not chemical makeup, and needs ongoing care to prevent breakage.
18 citations
,
August 2009 in “Skin Research and Technology” OCT can identify hair structures, but chemical treatments can damage them.
28 citations
,
July 1980 in “British Journal of Dermatology” The hair disorder was caused by abnormal protein formation, making hair easily damaged.
20 citations
,
December 2012 in “Journal of molecular structure” The study found that thioglycolic acid breaks down hair bonds more consistently than l-cysteine, which is less damaging to hair.
7 citations
,
September 2020 in “International Journal of Cosmetic Science” Different sizes of keratin peptides can strengthen hair, with smaller ones possibly increasing volume and larger ones repairing damage.
January 2017 in “Clinical approaches and procedures in cosmetic dermatology” Cosmetic procedures can harm hair, but damage can be minimized with knowledge and care; however, once hair is damaged, it cannot be reliably repaired.
2 citations
,
July 2025 in “Forensic Sciences” Anabolic-androgenic steroids can damage the brain, causing mood and cognitive problems.
February 2024 in “Medicina” AFM can diagnose hair disorders by revealing detailed hair surface changes.
15 citations
,
August 2020 in “Analytical chemistry” Hair lipids do not protect against humidity.
NaOH treatment improves hair strength and suitability for textiles.
49 citations
,
April 2010 in “International Journal of Cosmetic Science” Hair ages as the cuticle wears down, especially beyond 1 meter from the root, affecting its strength and shine.
18 citations
,
November 2010 in “Journal of morphology” Antler velvet hair and body hair of red deer have different structures that help with protection and insulation.
2 citations
,
July 2019 in “Cosmetics” Beautiful hair is flexible and elastic due to its unique double-layered structure and can be enhanced with succinic acid treatment.
1 citations
,
October 2009 in “International Journal of Cosmetic Science” A new keratin treatment can strengthen and protect aging hair.
June 2023 in “Experimental dermatology” Pubic hair has a thicker, more protective outer layer than scalp hair, possibly due to evolution.
November 2011 in “Informa Healthcare eBooks” Environmental, chemical, mechanical, and personal health factors can all damage hair and contribute to hair loss or changes in hair quality.
August 2010 in “한국한의학연구원 논문집” Phellodendri Cortex Extract may help treat benign prostatic hyperplasia.
January 2010 in “Journal of Oriental Medicine” Phellodendri Cortex Extract may help treat enlarged prostate.
84 citations
,
April 2015 in “Cosmetics” Hair dyes vary in how long they last and how deeply they penetrate hair.
March 2010 in “Cosmetic Dermatology” Hair straightening methods have advanced to improve effectiveness and reduce damage, but still rely on heat and chemicals.
17 citations
,
February 1987 in “Journal of the American Academy of Dermatology” The hair cuticle acts as a barrier against fungal infection, which occurs only deep within the hair follicle.
16 citations
,
July 2019 in “Journal of Cellular Biochemistry” Wnt7a protein is crucial for development and tissue maintenance and plays varying roles in diseases and potential treatments.
Modern hair styling products don't repair hair but improve its surface and stability.
September 2025 in “OPAL (Open@LaTrobe) (La Trobe University)” SELP::KP improves hair strength, elasticity, and health, making it a promising hair cosmetic.