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GlossaryLight Exposure

amount of light received by an organism over time

Light Exposure refers to the amount of light that an object or organism receives over a period of time. This can include natural sunlight or artificial light sources. In biological contexts, light exposure can significantly impact various physiological processes, such as circadian rhythms, skin health, and hair growth. For instance, excessive exposure to ultraviolet (UV) light can damage skin cells and hair follicles, potentially leading to conditions like alopecia.

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Photostability and Toxicity of Finasteride, Diclofenac, and Naproxen Under Simulated Sunlight Exposure: Evaluation of the Toxicity Trend and Packaging Photoprotection

research Photostability and toxicity of finasteride, diclofenac and naproxen under simulating sunlight exposure: evaluation of the toxicity trend and of the packaging photoprotection

13 citations , December 2013 in “Chemistry Central Journal”

Sunlight exposure increases drug toxicity; amber glass best for protection.

Study of Photostability of Finasteride, Diclofenac, and Naproxen Through Exposure to Simulated Sunlight and Evaluation of Packaging Photoprotection of These Drugs

research Study of Photostability of Finasteride, Diclofenac and Naproxen Through Exposure of Simulated Sunlight and Evaluation of Packaging Photoprotection of These Drugs

January 2010

Finasteride is more stable in sunlight than Diclofenac and Naproxen.

research Skin and scalp under exposure to high-energy visible light: the current perspective

2 citations , March 2025 in “Archives of Dermatological Research”

HEV light can harm or help skin and scalp, so safe exposure guidelines are needed.

research Vitamin D and the Skin: An Update for Dermatologists

114 citations , October 2017 in “American journal of clinical dermatology”

Adequate vitamin D is crucial for skin health and should be considered in dermatology.

research Photoaggravation of hair aging

24 citations , January 2009 in “International Journal of Trichology”

Sunlight exposure ages hair, making it brittle, stiff, and dry.

research Characterization of Cutaneous Photoxicity Induced by Topical Alpha-Terthienyl and Ultraviolet A Radiation

22 citations , September 1986 in “Journal of Investigative Dermatology”

Low-dose topical alpha-terthienyl may be a safer option for treating skin conditions with light therapy.

research Skin precancer.

16 citations , January 1998 in “PubMed”

Sun exposure and genetics increase skin cancer risk from precancerous lesions.

research Serum vitamin D₃levels and diffuse hair fall among the student population in South India: A case–control study

15 citations , January 2016 in “International journal of trichology”

Low vitamin D3 levels are significantly linked to hair loss, especially in female students.

research Androgenetic alopecia in policemen: higher prevalence and different risk factors relative to the general population (KCIS no. 23)

12 citations , September 2011 in “Archives of Dermatological Research”

Policemen have more hair loss due to obesity, sunlight exposure, and stress.

research Vitamin D Resistance and Alopecia

7 citations , May 1985 in “Archives of dermatology”

Vitamin D is important for more than just bone health.

research Effect of Lifestyle Pattern and Cultural Practices on Vitamin D Status of Muslim Women in Coimbatore City

1 citations , February 2022 in “Indian Journal of Nutrition and Dietetics/Indian journal of nutrition and dietetics”

Muslim women in Coimbatore with limited sunlight exposure due to cultural dress and lifestyle have low vitamin D levels.

research Measuring oxidative damage to human hair from solar radiation and pollution: A critical review

May 2026 in “Journal of Photochemistry and Photobiology”

Solar radiation and pollution damage hair, especially light-colored and bleached hair.

Assessment of Vitamin D Levels Among Medical Laboratory Visitors in Misurata City and Their Association with Seasonal Variations

research Assessment of Vitamin D Levels Among a Sample of Medical Laboratory Visitors in Misurata City and their Association with Seasonal Variations

August 2025 in “Japan Journal of Clinical & Medical Research”

Many people in Misurata City have low vitamin D, especially women and those aged 35-45, with levels dropping in winter and spring.

research Vitamin D Deficiency and Risk of Hair Loss: Knowledge and Practice of Adult Female Population in Saudi Arabia, 2020

December 2021 in “Journal of pharmaceutical research international”

Many women in Saudi Arabia need to take more vitamin D to help prevent hair loss.

Imaging of Photo-Damaged Hair with Differential Phase Scanning X-Ray Microscopy

research Imaging of Photo-Damaged Hair with a Differential Phase Scanning X-Ray Microscopy

January 2017 in “Nihon Keshouhin Gijutsushakaishi/Journal of S C C./Nihon Keshouhin Gijutsushakai kaishi”

Sunlight and chemical treatments change hair's internal structure differently, needing specific care.

research Clinicopathological study of discoid lupus erythematosus.

March 2009

Discoid Lupus Erythematosus is more common in women aged 31-40, often worsened by sunlight, and confirmed by specific lab tests.

Knowledge, Attitude, and Practices Related to Vitamin D, Zinc, and Ferritin Deficiencies and the Associated Risk of Hair Loss in Jazan, Saudi Arabia

research Knowledge, Attitude, and Practices Related to Vitamin D, Zinc, and Ferritin Deficiencies and the Associated Risk of Hair Loss in Jazan, Saudi Arabia

November 2023 in “Cureus”

Most people in Jazan know about vitamin D, zinc, and ferritin's link to hair loss but don't practice enough preventive measures.

research Cyberspace Chat: Beyond genetics part III: evidence that lifestyle choices may impact hair loss in androgenetic alopecia

July 2012 in “Hair transplant forum international”

Lifestyle choices like stress, smoking, heavy drinking, sun exposure, and chemical hair treatments might speed up hair loss in people with androgenetic alopecia.

research Effect of cultural factors on hair fall

January 2016 in “MRIMS Journal of Health Sciences”

Good cultural practices and proper nutrition can prevent hair loss in girls.

research Aseptic Necrosis of Warts Instead of Lymphangitis

July 1976 in “Archives of Dermatology”

Some people may naturally have beaded lines on their skin that are more visible with certain treatments, and hair loss similar to post-pregnancy can occur after specific diet and therapy.

research Ultraviolet and androgenetic alopecia

March 2023 in “Chinese Journal of Dermatology”

Protecting hair and scalp from sunlight may help prevent hair loss.

Ultraviolet Light-Induced Leukoderma of the Scalp Associated with Androgenetic Alopecia: Senescent Actinic Depigmentation of the Scalp

research Ultraviolet Light-Induced Leukoderma of the Scalp Associated with Androgenetic Alopecia: Senescent Actinic Depigmentation of the Scalp

9 citations , September 2009 in “Journal of Cutaneous Medicine and Surgery”

UV light causes skin color loss in bald areas; wear a cap and use sunscreen.

research A novel LC-MS/MS analysis of vitamin D metabolites in mice serum and hair: impact of diet and light exposure

1 citations , February 2025 in “Frontiers in Endocrinology”

Diet and sunlight are important for maintaining good vitamin D levels.

research Androgenic Alopecia and Stress-Induced Premature Senescence by Cumulative Ultraviolet Light Exposure

27 citations , January 2002 in “Exogenous Dermatology”

Chronic exposure to sunlight may worsen male pattern baldness and protecting the scalp from the sun could slow it down.

Simulated Solar Radiation Induced Skin Inflammation Across Skin Types Measured by Dynamic Optical Coherence Tomography and Laser Doppler

research 1618 Simulated solar radiation (SSR) induced skin inflammation across skin types measured by dynamic optical coherence tomography and laser doppler

April 2023 in “Journal of Investigative Dermatology”

Sunlight simulation causes skin inflammation, with different skin types reacting at different levels of exposure.

research About photo-damage of human hair

66 citations , September 2005 in “Photochemical & photobiological sciences”

We don't fully understand how sunlight damages different types of hair.

research Anomalous Fluorescence of White Hair Compared to Other Unpigmented Keratin Fibres

6 citations , December 2019 in “International Journal of Cosmetic Science”

White hair has weaker tryptophan fluorescence than other unpigmented fibers, possibly due to UV exposure or unknown substances.

research Data for the article "Increased calcidiol level in redhaired people: Could redheadedness be an adaptation to temperate climate?"

January 2019 in “Figshare”

Redheaded people have higher levels of vitamin D precursor, suggesting their hair color may be an adaptation to low sunlight areas.

research Flexural Agminated Eruptive Nevi in Langerhans Cell Histiocytosis

9 citations , May 2013 in “JAMA Dermatology”

Sunlight exposure improved a patient's skin condition, and there may be a link between a certain disease and skin growths; a leukemia treatment caused changes in hair color and growth.

research Modeling of solar UV-induced photodamage on the hair follicles in human skin organoids

January 2024 in “Journal of tissue engineering”

Sunlight exposure damages hair follicles, but certain stem cell-derived particles can reduce this damage and help with hair regeneration.