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GlossaryUltraviolet A damage (UVA 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 Effect of Conditioned Media Collected from Human Amniotic Fluid-Derived Stem Cells on Skin Regeneration and Photo-Aging

9 citations , February 2014 in “Tissue Engineering and Regenerative Medicine”

Conditioned media from human amniotic fluid-derived stem cells helps skin heal and protects against aging from sun exposure.

research Study on Changes in Hair Properties Induced by Ultraviolet A

June 2016 in “한국디자인문화학회지”

UVA damages all hair types, especially permanently waved and colored hair.

research Camellia Sinensis Seed Flavonoids Attenuate UVB-Induced Inflammation and UVA-Induced Photodamage via MAPK/NF-κB and AP-1 Pathways

March 2026 in “Molecules”

Camellia sinensis seed flavonoids can reduce skin inflammation and damage from UV rays.

research Dissecting the Impact of α-MSH-MC1R-cAMP Signaling on UVA-Induced Stress in Fibroblasts: Implications for Regulation of Cutaneous Photoaging

January 2026 in “Aging and Disease”

The α-MSH-MC1R-cAMP pathway does not protect skin cells from UVA damage.

research A Novel In Vivo Model for Evaluating Agents That Protect Against Ultraviolet A-Induced Photoaging

26 citations , April 1998 in “Journal of Investigative Dermatology”

Sunscreens with higher SPF and UVA filters offer the best protection against skin aging from UVA rays.

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community When I’m 60 and finally off the fin after 40 years and look at my semen

in Satire 862 upvotes 4 years ago

Hair loss treatments discussed include Minoxidil, Finasteride, and RU58841. Users share experiences with Finasteride, mentioning watery semen as a side effect and weighing its importance against maintaining hair.

community UVA researchers discovered stem cells that plays a crucial role in hair growth - We are closer than ever to the cure!

in Research/Science 280 upvotes 1 year ago

Researchers at the University of Virginia discovered a new group of stem cells in hair follicles that could potentially restore hair growth. The findings suggest that activating these stem cells might offer a new way to combat hair loss, though practical treatments are still years away.

community Sucess story for you guys, pics are 10+ years apart.

in Progress Pictures 311 upvotes 2 years ago

A user shared a success story showing hair regrowth over 10 years, attributing it to quitting creatine and taking 0.5mg finasteride. Some commenters were skeptical about creatine's impact, while others inquired about side effects, and the original poster reported no negative effects from finasteride.

community 5 month update on my all natural protocol

in Update 8 upvotes 7 years ago

The user updated on their all-natural hair loss protocol, which includes massages, LLLT, Ashwagandha, Supergreens mix, Vitamin D, Castor Oil + DMSO, a specific diet, and headstands. They reported some hair regrowth and improved hair quality, with plans to continue the regimen and monitor results.

community So does oral minoxidil age your skin or not

in Minoxidil 41 upvotes 1 year ago

Oral minoxidil may cause dry skin and dark eye bags but doesn't significantly age the skin. Topical minoxidil is toxic to cats, and some users prefer finasteride.

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