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Glossary Visible Light

portion of the electromagnetic spectrum detectable by human eyes

Visible light, also known as the visible spectrum, is the portion of the electromagnetic spectrum that can be detected by the human eye. It ranges from wavelengths of approximately 380 to 750 nanometers and is responsible for the colors we perceive, from violet to red.

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research Effects of Visible Light on the Skin^†

195 citations , January 2008 in “Photochemistry and Photobiology”

This review discusses the effects of visible light on human skin, highlighting its role in pigmentation, thermal damage, and the treatment of several skin conditions, while noting limited sunscreen protection against it; no new clinical results are reported.

research Visible red light enhances physiological anagen entry in vivo and has direct and indirect stimulative effects in vitro

35 citations , December 2014 in “Lasers in surgery and medicine”

This study found that red light accelerated the transition from the resting to growth phase in hair follicles faster than green and blue light in mice, suggesting it may stimulate hair growth.

research Photobiomodulation in Dermatology: Harnessing Light from Visible to Near Infrared

9 citations , January 2018 in “Medical research archives”

This review discusses the therapeutic use of photobiomodulation for various skin conditions, highlighting its efficacy in accelerating tissue repair, reducing inflammation, and treating pigmentary disorders and other skin diseases, but it reports no new clinical results.

research A study of the photolightening mechanism of blond hair with visible and ultraviolet light

7 citations , September 2004 in “International Journal of Cosmetic Science”

This study demonstrated that visible light lightens blond hair more effectively than ultraviolet light, attacking melanin granules directly, whereas ultraviolet light primarily damages other hair tissues following washing.

research Green chemistry method for hair strengthening and setting using visible light-mediated protein crosslinking

4 citations , June 2022 in “Journal of cleaner production”

This study found that a new eco-friendly hair crosslinking method using visible light and non-toxic chemicals caused less damage and improved mechanical properties compared to traditional thioglycolic acid treatment.

Visible Light-Mediated Environmentally Friendly Green Chemistry for Hair Cross-Linking

research Visible Light-Mediated Environmentally Friendly and Universally Applicable Green Chemistry for Hair Cross-Linking

3 citations , June 2023 in “ACS sustainable chemistry & engineering”

In this study, a method using riboflavin phosphate, citric acid, and polyols successfully optimized protein cross-linking in hair of all colors through visible light-mediated photo-cross-linking, improving the mechanical properties and hair-setting effects without the influence of hair color.

research 644 Response of distinct human dermal fibroblast lineages to visible radiation: Potential for differential light-based therapy

September 2017 in “The journal of investigative dermatology/Journal of investigative dermatology”

This study found that while 450nm blue light can inhibit collagen and induce oxidative stress in dermal fibroblasts, 850nm near-infrared light may enhance metabolic activity without causing oxidative damage, suggesting potential for tailored light therapies in skin treatments.

research The growth of human scalp hair mediated by visible red light laser and LED sources in males

117 citations , September 2013 in “Lasers in Surgery and Medicine”

This study found that low level laser therapy at 655 nm significantly increased hair counts in males with androgenetic alopecia.

research The effects of narrowbands of visible light upon some skin disorders: a review

17 citations , December 2015 in “International Journal of Cosmetic Science”

This review discusses the effectiveness of non-thermal, non-ablative devices like light-emitting diodes in treating various skin and hair conditions but reports no new clinical findings.

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 A local drug delivery system based on visible light-cured glycol chitosan and doxorubicin⋅hydrochloride for thyroid cancer treatment in vitro and in vivo

27 citations , January 2018 in “Drug Delivery”

In this study, researchers investigated a new local drug delivery system using glycol chitosan hydrogel and doxorubicin (GC10/DOX) for thyroid cancer in mice, finding it produced a stronger antitumor effect compared to conventional treatment methods.

research The growth of human scalp hair in females using visible red light laser and LED sources

81 citations , August 2014 in “Lasers in Surgery and Medicine”

This study found that low-level laser therapy significantly increased hair growth in women with androgenic alopecia, achieving a 37% greater increase in hair counts compared to placebo.

Review of the Current Understanding of the Effect of Ultraviolet and Visible Radiation on Hair Structure and Options for Photoprotection

research Review of the current understanding of the effect of ultraviolet and visible radiation on hair structure and options for photoprotection

22 citations , July 2004 in “International Journal of Cosmetic Science”

This article reviews the impact of UV radiation and visible light on human hair structure and summarizes protective strategies, reporting no new clinical results.

research Melasma, a photoaging disorder

144 citations , December 2017 in “Pigment cell & melanoma research”

This review suggests that melasma may be a photoaging skin disorder affecting genetically predisposed individuals, which could significantly influence its treatment and prevention strategies.

research Antioxidants in dermatology

86 citations , June 2017 in “Anais Brasileiros de Dermatologia”

This review discusses the role of antioxidants in managing oxidative skin damage and reports no new results, emphasizing the need for understanding their mechanisms, limitations, and risks for safe use.

research Photoaggravation of hair aging

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

This review discusses the mechanisms by which sunlight exposure aggravates hair aging and highlights the role of hair pigments in providing photochemical protection, reporting no new results.

research Photoageing of Hair Fiber and Photoprotection

18 citations , March 2009 in “Skin pharmacology and physiology”

This study found that sunlight exposure causes significant structural and chemical damage to hair, including cuticle loss, cortex damage, and discoloration, with water playing a major role in discoloration of brown hair.

research Spectroscopy as a tool to evaluate hair damage and protection

2 citations , November 2018 in “International Journal of Cosmetic Science”

This study proposes a simple fluorescence method to evaluate hair damage and protection, suggesting that emissive properties of hair can aid in substantiating cosmetic claims.

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

May 2026 in “Journal of Photochemistry and Photobiology”

This review found that solar radiation, pollution, and trace metals cause significant damage to human hair, with factors like UVB radiation primarily affecting light-colored and bleached hair; most data were derived from in vitro and ex vivo simulations.

research The Quantification of Terminal Hair by Digital Microscopy: Advancements Towards a More Objective Diagnosis of Hirsutism

November 2025 in “Clinical Cosmetic and Investigational Dermatology”

In this study, researchers suggest that digital microscopy using visible light could offer a more objective approach to diagnosing hirsutism by quantifying terminal hair, with future research needed to assess its usefulness in women with the condition.

research 521 Deciphering Pathomechanisms in Solar Urticaria

November 2022 in “Journal of Investigative Dermatology”

This study found that in mouse melanocytes, the cytoplasmic dynein complex component Dynlt3 is necessary for proper melanosome transport, acidity regulation, and effective transfer to keratinocytes, linking it to skin pigmentation processes.

A Systematic Review of Laser-Based Treatments for Hair Loss

research A SYSTEMATIC REVIEW OF LASER-BASED TREATMENTS FOR HAIR FALL

September 2024 in “Pakistan Journal of Science”

This systematic review suggests that laser treatments, especially low-level laser therapy and excimer lasers, may be effective for hair regrowth, though further large-scale studies are needed for validation.

research Effect of decellularisation methods on methacryloyl-substituted placental ECM hydrogels

January 2020

This research concluded that the novel hydrogel PlacMA, derived from human placenta and curable by visible light, shows promise for cell culture and tissue engineering applications due to its tunable properties.

research On the etiology of vitiligo and gray hair

303 citations , August 1971 in “The American Journal of Medicine”

This report suggests that in vitiligo, melanocytes may be destroyed by the same factors necessary for melanin production, contributing to the skin's depigmentation.

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.

research Hair removal evaluated with a filterless flashlamp‐based system: a preliminary study in 10 patients

7 citations , January 2003 in “Journal of cosmetic and laser therapy”

This study concluded that the Spa Touch system effectively retards hair regrowth, functioning like a "light razor" for quick and cost-effective epilation.

research Effect of Microneedling with Growth Factors and Low-Level Light Therapy on Trichotillomania Treatment

April 2025 in “Journal of Applied Cosmetology”

This study found that a combination of microneedling with growth factors and low-level light therapy led to visible hair regrowth without side effects in a patient with trichotillomania.

Low-Level Light Therapy Downregulates Scalp Inflammatory Biomarkers in Men With Androgenetic Alopecia and Boosts Minoxidil 2% for Sustainable Hair Regrowth

research Low‐Level Light Therapy Downregulates Scalp Inflammatory Biomarkers in Men With Androgenetic Alopecia and Boosts Minoxidil 2% to Bring a Sustainable Hair Regrowth Activity

4 citations , May 2021 in “Lasers in Surgery and Medicine”

This study observed that adding low-level light therapy with the GentleWaves® device to Minoxidil significantly boosted hair regrowth in men with androgenetic alopecia by reducing scalp inflammation.

research Pseudopili Annulati in a Dark‐Haired Individual: A Light and Electron Microscopic Study

13 citations , January 2001 in “Pediatric dermatology”

This study reports pseudopili annulati in a dark-haired Chinese girl, identifying the unique appearance and structural characteristics of her hair without finding abnormalities in the cuticle and cortex.

research Breaking the “rule-of-five” to access Bridged Bicyclic Heteroaromatic Bioisosteres

3 citations , May 2025

This study introduces a novel visible light-mediated intramolecular [2+2] cycloaddition process that forms 6-azabicyclo[3.1.1]heptanes, offering a new synthesis route for bioisosteric mimetics used in drug discovery, potentially expanding medicinal chemistry applications beyond traditional limitations.