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GlossaryUltraviolet A damage

harm from deep-penetrating UVA rays causing skin aging and cancer

Ultraviolet A (UVA) damage refers to the harm caused by UVA radiation, a type of ultraviolet light from the sun that penetrates deep into the skin. This damage can lead to premature aging, DNA mutations, and an increased risk of skin cancer. UVA rays are less intense than UVB rays but are more prevalent and can penetrate through clouds and glass, making them a significant concern for long-term skin health.

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research Photoprotective Effects of Caffeic Acid against Ultraviolet-induced Damages on Human Follicle Dermal Papilla Cells

2 citations , March 2017 in “Asian Journal of Beauty and Cosmetology”

Caffeic acid protects human scalp cells from UV damage.

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”

UV radiation damages hair similar to bleaching, but double bleaching causes more severe protein degradation.

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

September 2025 in “International Journal of Cosmetic Science”

Heat and UV exposure damage hair structure by altering keratins.

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”

Protein kinase C epsilon may promote skin cancer development after UV exposure by affecting nearby cells.

research Ultrastructure study of hair damage after ultraviolet irradiation

2 citations , December 2013 in “Journal of Cosmetic Dermatology”

UV treatment can damage hair, so protection is advised.

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community Tretinoin can make it worse!!!

in Chat 7 upvotes 2 years ago

Tretinoin may enhance minoxidil's effectiveness for those not responding to minoxidil alone, but it could reduce efficacy for some who are already responding to minoxidil. Tretinoin requires careful use, including skin moisturizing and sun protection due to increased sensitivity.

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