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research Key locations of oxidative damage in human hair keratins after heat and ultraviolet light exposure

September 2025 in “International Journal of Cosmetic Science”

This study observed that exposing human hair keratins to heat or UV treatments led to modifications in cysteine residues, disrupting crucial disulphide bonds and potentially reducing the structural integrity of hair similar to prolonged styling or sunlight exposure.

research Protein Kinase C Epsilon Signals Ultraviolet Light‐induced Cutaneous Damage and Development of Squamous Cell Carcinoma Possibly Through Induction of Specific Cytokines in a Paracrine Mechanism^¶

3 citations , January 2005 in “Photochemistry and Photobiology”

This study found that overexpression of PKCɛ in mouse epidermis increased sensitivity to metastatic squamous cell carcinoma, suggesting that a PKCɛ-mediated microenvironment may promote cancer development through specific cytokines like TNFα.

research Montagna Symposium 2013—Light and Skin: How Light Sustains, Damages, Treats, Images and Modifies Skin Biology

1 citations , July 2014 in “The journal of investigative dermatology/Journal of investigative dermatology”

This review discusses various topics from the 62nd Annual Montagna Symposium on the Biology of Skin, focusing on the diverse effects of light on skin biology, and reports no new clinical results.

research Decision letter: Role of distinct fibroblast lineages and immune cells in dermal repair following UV radiation-induced tissue damage

June 2021

This study found that chronic UVR exposure in mice and humans leads to a permanent loss of papillary fibroblasts in the upper dermis, which is associated with changes in the extracellular matrix.

The Ethnic Differences in Hair Damage and Integral Hair Lipid After Ultraviolet Radiation

research The Ethnic Differences of the Damage of Hair and Integral Hair Lipid after Ultra Violet Radiation

59 citations , January 2013 in “Annals of Dermatology”

In this study, researchers found that Asian hair contains more integral lipids than European or African hair, which may protect it better from UV-induced damage.

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community New Light Therapy Can Suppress a Key Marker of Hair Loss by 92%

in Research/Science 201 upvotes 5 months ago

A new light therapy claims to reduce hair loss markers by 92% using a specific wavelength range. Users discuss the cost and effectiveness of devices, with some expressing skepticism and others considering alternative treatments like red light therapy and vitamin D exposure.

community South Korean Red Light Therapy Study

41 upvotes 6 months ago

Korean scientists developed a red light therapy that reduces a hair loss marker by 92%. Users discussed the benefits and drawbacks of natural sunlight versus red light caps for hair health, with some suggesting supplements for vitamin D.

community Red Light Therapy: Cheap Chinese LED caps are better than $3000 laser caps

in Research/Science 37 upvotes 1 year ago

Affordable 92-LED caps may be more effective for hair growth than expensive 270-laser caps due to higher power output and irradiance. The LED caps deliver more energy to the scalp, making them a cost-effective alternative for red light therapy.

community Are These Babyhairs? (M30, 8.5 Months Fin, 4 Months Min)

8 upvotes 3 weeks ago

The user has been using oral finasteride and topical minoxidil with tretinoin for hair regrowth, noticing new baby hairs after a shedding phase. Users advise wearing sunscreen or a hat to protect the scalp from sun damage.

community Sunlight: Does it Stimulate Hair Growth or Hair Loss?

in Research/Science 64 upvotes 2 years ago

The conversation discusses whether sunlight exposure affects hair growth or loss, with mixed anecdotes and theories but no clear consensus. Some suggest moderate sunlight can benefit hair by providing vitamin D, while others doubt its effectiveness compared to treatments like Minoxidil or finasteride.

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