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research Impact of ultraviolet radiation‐induced damage to hair fiber integrity: A multi‐technique physicochemical characterization of surface and cortex properties

May 2026 in “International Journal of Cosmetic Science”

This study found that UV radiation exposure during a simulated Brazilian summer caused more significant mechanical damage to natural hair than bleaching, although both caused comparable structural alterations, with double bleaching leading to the most severe protein degradation.

research Cuticle damage and the tensile properties of human hair

27 citations , February 1991

This study found that extensive cuticle damage from diperisophthalic acid oxidation did not alter the tensile properties of human hair, suggesting that these properties are mainly due to the cortex rather than the cuticle.

research Heat‐damaged evaluation of virgin hair

13 citations , March 2019 in “Journal of cosmetic dermatology”

This study found that thermal hair-straightening devices significantly damaged the cuticle and cortex of virgin Asian and Caucasian hair, with Asian hair experiencing more protein loss than Caucasian hair.

research Torsional method for evaluating hair damage and performance of hair care ingredients

9 citations , March 2005 in “International Journal of Cosmetic Science”

This study found that torsional measurements can effectively distinguish the effects of hair care products on the cuticle versus the cortex of hair fibers, unlike tensile measurements.

research Investigation of hair dye deposition, hair color loss, and hair damage during multiple oxidative dyeing and shampooing cycles.

4 citations , August 2016 in “PubMed”

This study analyzed how oxidative hair dye leaches from pigmented and nonpigmented hair during wash cycles, finding that melanin influences the dye deposition and leaching processes.

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community Dutasteride made my hair curlier

518 upvotes 4 months ago

Dutasteride improved hair curliness and was preferred over finasteride due to fewer side effects. The user switched from finasteride to dutasteride, taking 0.5mg daily for 6 months.

community Inflammation's surprising role in shrinking hair follicles and AGA

in Technology 66 upvotes 4 months ago

Inflammation plays a significant role in hair follicle miniaturization and androgenetic alopecia, with treatments like ketoconazole shampoo, minoxidil, and finasteride being used to address it. Users discuss the benefits of anti-inflammatory treatments and peptides like KPV, alongside traditional hair loss treatments, to improve scalp health and hair quality.

community My Theory Of Androgenic Alopecia

16 upvotes 10 months ago

Hair loss is linked to cellular physiology and the IGF-1 to TGF-B1 ratio, not just androgen sensitivity. The theory lacks evidence, while finasteride and minoxidil are effective treatments.

community 3,5 months of only topical minoxidil

776 upvotes 9 months ago

A 24-year-old reported new hair growth on temples after 3.5 months of using topical minoxidil without shedding. They plan to add finasteride to maintain progress, as minoxidil alone may not be enough long-term.

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