39 citations
,
June 2017 in “Scientific Reports” Different lab conditions and light treatment methods change how human skin cells respond to light therapy.
34 citations
,
September 2019 in “Clinical, Cosmetic and Investigational Dermatology” Light therapy can stimulate hair growth and is more effective when started early, but more research is needed on its long-term effects and optimal use.
38 citations
,
August 2012 in “Biochemical and biophysical research communications” Human leukocytes and beard hair follicle cells have internal daily clocks, and PER1 and PER3 genes may indicate individual circadian rhythms.
11 citations
,
April 2021 in “Advanced synthesis & catalysis” PXX is an effective and affordable photocatalyst for creating new chemical bonds in organic synthesis.
January 2026 in “Forum Dermatologicum” Light-emitting diode (LED) photobiomodulation (PBM) is a safe and promising treatment in dermatology, showing moderate efficacy for conditions like inflammatory acne, photoaging, and androgenetic alopecia. Red and near-infrared (NIR) light can improve skin texture and reduce wrinkles, while low-level light therapy (LLLT) significantly increases hair density in androgenetic alopecia. However, consumer devices often have lower irradiance and fluence, leading to limited efficacy. The review highlights the need for standardization of device parameters and high-quality trials, especially for consumer devices, to better establish their clinical benefits. LED therapy is generally supportive rather than primary, with a favorable safety profile and mild, transient adverse effects.
129 citations
,
October 2017 in “BMC Genomics” The study improved understanding of gene roles in cashmere goat hair growth, aiding future cashmere production.
April 2024 in “International journal of molecular sciences” Light-based treatment, Photobiomodulation, shows promise for non-invasive skin therapy with few side effects.
September 2017 in “Journal of Investigative Dermatology” Blue light helps hair growth by affecting specific proteins in hair follicle cells.
7 citations
,
January 2003 in “Journal of cosmetic and laser therapy” The filterless flashlamp-based system effectively delays hair regrowth and improves skin condition.
4 citations
,
March 2013 in “The American Journal of Cosmetic Surgery” Melanin absorbing light is necessary but not enough for effective hair removal by light treatment.
April 2026 in “Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy” 
September 2023 in “Journal of The American Academy of Dermatology” People were generally happy with the home light therapy devices for hair loss.
September 2025 in “International Journal of Innovative Technologies in Social Science” Red light therapy may help rejuvenate skin and regrow hair.
1 citations
,
January 2008 in “Laser therapy” Endré Mester is highly regarded as the 'Godfather' of phototherapy.
134 citations
,
September 2008 in “Lasers in surgery and medicine” Low fluence photoepilation temporarily removes hair by targeting the hair follicle's pigmented area without severe damage.
5 citations
,
November 2009 in “Revista médica de Chile” Hair growth cycles in Chileans vary seasonally, with more hair resting in summer and growing in winter.
11 citations
,
November 2002 in “Dermatologic Surgery” IPL can cause unexpected hair growth in nearby untreated areas.
October 2022 in “Journal of Pharmaceutical Negative Results” Photobiomodulation therapy shows promise in treating various health conditions by using specific light wavelengths.
October 2022 in “Journal of ophthalmology” Light therapy may improve eye conditions by stimulating cell activity and increasing oxygen availability.
116 citations
,
May 2013 in “Proceedings of the National Academy of Sciences of the United States of America” Hair grows faster in the morning and is more vulnerable to damage from radiation due to the internal clock in hair follicle cells.
23 citations
,
December 2001 in “Lasers in Surgery and Medicine” Permanent hair removal is hard, but using longer laser pulses at lower power might improve results.
Delta-opioid receptors affect skin cell circadian rhythms, possibly impacting wound healing and cancer.
2 citations
,
April 2023 in “Archives of Aesthetic Plastic Surgery” The phototrichogram is better for measuring hair thickness.
18 citations
,
March 2015 in “Journal of Investigative Dermatology” Silencing certain circadian clock genes increases skin pigmentation.
Melatonin shortens the hair growth cycle by increasing PDGFA gene expression.
September 2024 in “Digital Commons - University of South Florida (University of South Florida)” Hormones can change ptarmigan feather color from white to pigmented.
6 citations
,
December 2011 in “Nature” The circadian clock in skin cells controls their growth and rest cycles.
4 citations
,
April 2014 in “Lasers in Surgery and Medicine” TRASER effectively targets blood vessels and hair follicles for potential use in vascular and hair removal treatments.