January 2024 in “Annals of Agricultural and Environmental Medicine” This study observed that LED therapy improved hair regrowth and reduced hair loss in patients with post-COVID telogen effluvium, with or without androgenetic alopecia, compared to those who did not receive LED treatment.
36 citations
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June 2018 in “Journal of Dermatology” This article updates Japanese guidelines for diagnosing and treating male and female-pattern hair loss, recommending specific drugs and therapies while advising against certain treatments for female-pattern hair loss.
4 citations
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October 2009 in “Skin research and technology” This study found that tristimulus colorimetry is a sensitive and quantitative method for projecting hair growth rates in depilated mice, and it observed that 890 nm LED irradiation promotes hair regrowth.
1 citations
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February 2023 in “Pharmaceutics” This study suggests that UVA-responsive nanocapsules may provide an effective method for skin antisepsis by releasing ethanol and reducing microorganisms within hair follicles on ex vivo porcine ear skin.
April 2021 in “Institutional Repositories DataBase (IRDB)” This study reported that high-intensity red LED irradiation increased osteogenic differentiation and mineralization of human bone marrow mesenchymal stem cells, potentially through Wnt/β-catenin pathway activation.
3 citations
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October 2020 in “Internatuinal Journal of Radiation Research” This study reports that γ-ray exposure in rats led to dermal endothelial proliferation, new vessel formation around hair follicles, and increased inflammatory markers, suggesting possible early stimulatory effects on hair growth.
May 2025 in “Journal of Photochemistry and Photobiology B Biology” In this study, researchers observed that blue LED irradiation enhanced cosmetic permeation, increased diameter, and improved resistance of hair fiber in Caucasian and Asian ethnic groups, whereas African hair showed less change.
9 citations
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June 2020 in “European Radiology Experimental” This study found that single-dose x-ray irradiation in rat calvaria skin led to morphological changes in collagen fibers, disorganization, and a temporary absence of sebaceous glands and hair follicles.
3 citations
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July 1969 in “PubMed” This study found that unilateral neutron irradiation in pigs significantly decreased the uptake of radioactive zinc in blood, impaired growth, and led to decreased organ weights and hair pigmentation changes on the irradiated side.
43 citations
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September 2017 in “Lasers in Surgery and Medicine” This study found that LED light irradiation induced proliferation and migration of human outer root sheath cells, potentially through the stimulation of the Wnt/β-catenin and ERK signaling pathways.
January 2016 in “프로그램북(구 초록집)” In this study, LED irradiation was found to promote hORSC proliferation and stimulate the Wnt5a/β-catenin and ERK signaling pathways, suggesting a potential mechanism for hair growth.
24 citations
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March 2009 in “Archives of dermatological research” This study found that a combination therapy of oral corticosteroid and oral PUVA led to scalp hair regrowth in patients with intractable alopecia totalis and universalis within two months.
11 citations
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January 1976 in “International Journal of Radiation Biology and Related Studies in Physics Chemistry and Medicine” This study found that a single X-radiation treatment in rat skin reduced collagen concentration over multiple hair-cycles by diminishing the fibroblasts' capacity for proline hydroxylation, potentially contributing to delayed skin lesions.
10 citations
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January 2004 in “PubMed” This study observed that gamma-ray induced apoptosis in ICR mouse hair follicles could be reduced by pretreatments with diethyldithiocarbamate or green tea, suggesting these agents as potential radioprotectors.
9 citations
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May 2019 in “Vestnik dermatologii i venerologii” This study demonstrated a method for delivering a photosensitizer, Ammi majus fructuum furocumarines, into hair follicles using calcium carbonate particles, followed by UVA irradiation, which led to significant pigment accumulation, indicating potential improvements for photochemical therapy.
7 citations
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January 2002 in “PubMed” This study observed significant skin changes, including epidermal thickening and pleomorphic keratinocytes, in rats after subchronic UVB irradiation, highlighting specific reactions in the dorsal skin.
2 citations
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December 2013 in “Journal of Cosmetic Dermatology” This study found that ultraviolet treatment for skin conditions such as vitiligo can damage hair, with psoralen plus ultraviolet A causing more follicle damage than narrow band ultraviolet B.
April 2021 in “Arab Journal of Nuclear Sciences and Applications/Arab Journal of Nuclear Sciences and Applications ” This study found that repeated use of a protein hair conditioner, followed by hot air and gamma irradiation, may lower serum collagen I and increase heat shock protein concentrations in rats, suggesting potential cumulative risks.
January 2026 in “Journal of Hard Tissue Biology” This study found that red LED photobiomodulation significantly enhanced both the metabolic activity and proliferation of human placenta-derived pericytes, alongside increased expression of angiogenic markers, suggesting a potential non-invasive approach to aid tissue repair and vascular regeneration.
March 2026 in “IntechOpen eBooks” This chapter explores the promising use of low-power laser irradiation for post-hysterectomy reconstructive care, emphasizing enhancements like a flexible fiber optic module, to potentially improve genitourinary rehabilitation in cervical cancer patients.
16 citations
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April 2015 in “Lasers in Surgery and Medicine” In this study, the researchers found that the effectiveness of a 1,550-nm fractional laser in promoting hair growth in mice depends on the specific combination of beam energy and density, with inappropriate settings potentially causing ulcers or hair follicle injury.
13 citations
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January 2018 in “Cellular Physiology and Biochemistry” This study found that UVB irradiation alters skin stem cell niches leading to signs of photoaging, which may be reversed by adipose-derived stem cells through BMP4 pathway modulation and niche remodeling.
14 citations
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September 2016 in “Journal of Photochemistry and Photobiology B Biology” This study observed that mercury-lamp irradiation may cause cleavage of disulfide bonds in keratins of white hair, leading to the formation of thiols in laboratory settings.
June 2017 in “Journal of The American Academy of Dermatology” LED light helps hair follicle cells grow and prevents them from dying by activating certain cell pathways.
May 2017 in “Journal of The American Academy of Dermatology” LED light helps human hair root cells grow and move by activating certain cell pathways.
May 2017 in “Journal of The American Academy of Dermatology” LED light helps human hair root cells grow and prevents them from dying by activating specific growth pathways.
1 citations
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September 2016 in “Journal of Dermatological Science” This study found that FGF18 signaling helps protect hair follicles from radiation damage by maintaining the resting phase and supporting stem cell survival, potentially reducing radiation-induced hair loss.
November 2024 in “Journal of Investigative Dermatology” In this study, UVB irradiation increased mast cell degranulation only when skin was innervated, suggesting that the interaction between mast cells and nerve fibres may exacerbate solar elastosis by promoting dysfunctional dermal elastic fiber accumulation, but further research is needed for confirmation.
In this study, low-level light therapy increased the proliferation and activation of dermal papilla cells, which in turn may enhance the growth of outer root sheath keratinocytes, suggesting potential mechanisms for improving hair follicle interaction.
December 2024 in “Medical alphabet” This study concludes that a combined therapy of erbium laser, transcutaneous laser blood irradiation, and minoxidil had the greatest impact on improving microcirculation efficiency in patients with diffuse telogen effluvium.