Overview

Red Light Therapy uses specific red and near-infrared wavelengths that are absorbed by skin cells. These wavelengths interact with cellular energy pathways involved in repair and regeneration. 

How this might help

Clinical studies suggest that red and near-infrared light can support collagen production, improve skin texture, and reduce the appearance of fine lines and wrinkles when used consistently over time. 

Selected Research Studies

(For clinicians and advanced readers)

• Avci P et al. Low-level laser (light) therapy in skin: stimulating, healing, restoring. Semin Cutan Med Surg. 2013.
  PubMed: https://pubmed.ncbi.nlm.nih.gov/24049929/

• Wunsch A, Matuschka K. A controlled trial to determine the efficacy of red and near-infrared light treatment in reduction of fine lines, wrinkles and skin roughness. Photomed Laser Surg. 2014.
  PubMed: https://pubmed.ncbi.nlm.nih.gov/24286286/

Overview

Red Light Therapy has been studied around exercise for its effects on muscle performance, circulation, and recovery markers. 

How this might help

Reviews and clinical trials report that pre- or post-exercise light exposure may help support performance, reduce delayed onset muscle soreness (DOMS), and assist recovery between training sessions in healthy adults and athletes. 

Selected Research Studies

• Vanin AA et al. Photobiomodulation therapy for the improvement of muscular performance and reduction of muscular fatigue associated with exercise in healthy people: a systematic review and meta-analysis. Lasers Med Sci. 2018.
  PubMed: https://pubmed.ncbi.nlm.nih.gov/29090398/

• Leal-Junior ECP et al. Photobiomodulation therapy in skeletal muscle: from mechanisms to clinical practice.
  (Narrative review on muscle performance and recovery.)
  Full text (PMC): https://pmc.ncbi.nlm.nih.gov/articles/PMC4340643/

Overview

Red Light Therapy has been explored in people with joint pain and degenerative joint conditions, focusing on pain, function, and inflammatory markers. 

How this might help

Systematic reviews and meta-analyses suggest that appropriately dosed low-level light may help reduce pain and improve function in conditions such as knee osteoarthritis and neck pain when used alongside standard care. 

Selected Research Studies

• Stausholm MB et al. Efficacy of low-level laser therapy on pain and disability in knee osteoarthritis: systematic review and meta-analysis of randomised placebo-controlled trials. BMJ Open. 2019.
  Full text (PMC): https://pmc.ncbi.nlm.nih.gov/articles/PMC6830679/

• Chow RT et al. Efficacy of low-level laser therapy in the management of neck pain: systematic review and meta-analysis. Lancet. 2009.
  PubMed: https://pubmed.ncbi.nlm.nih.gov/19913903/

Overview

At a cellular level, red and near-infrared light are absorbed by components of the mitochondrial respiratory chain. This interaction has been proposed to influence ATP (energy) production and downstream signalling pathways. 

How this might help

Experimental work suggests that light exposure within specific “dose windows” may support mitochondrial efficiency, modulate oxidative stress, and trigger protective and repair-related signalling in cells and tissues. 

Selected Research Studies

• de Freitas LF, Hamblin MR. Proposed mechanisms of photobiomodulation or low-level light therapy. IEEE J Sel Top Quantum Electron. 2016.
  PubMed: https://pubmed.ncbi.nlm.nih.gov/28070154/

• Hamblin MR. Mechanisms and applications of the anti-inflammatory effects of light-based therapies. AIMS Biophys. 2017.
  PubMed: https://pubmed.ncbi.nlm.nih.gov/28748217/
  Full text (PMC): https://pmc.ncbi.nlm.nih.gov/articles/PMC5523874/

Overview

Light exposure plays a role in brain metabolism and circadian regulation. Red and near-infrared light delivered to the head has been investigated in early-stage studies for its potential effects on mood and cognitive function. 

How this might help

Pilot trials and reviews report that transcranial applications of red/near-infrared light may be associated with improvements in depressive symptoms and cognitive performance in selected groups, when used as an adjunct to standard care. These approaches remain an active area of research. 

Selected Research Studies

• Cassano P et al. Transcranial light-based therapy for the treatment of major depressive disorder: ELATED-2 pilot trial. Photomed Laser Surg. 2018.
  PubMed: https://pubmed.ncbi.nlm.nih.gov/30346890/

• Caldieraro MA et al. Long-term near-infrared light treatment for anxious depression complicated by Takotsubo cardiomyopathy (case report). J Clin Psychopharmacol. 2018.
  PubMed: https://pubmed.ncbi.nlm.nih.gov/29601319/

• Salehpour F et al. Brain light-based therapy: a narrative review of mechanisms and clinical applications. Mol Neurobiol. 2018.
  PubMed: https://pubmed.ncbi.nlm.nih.gov/29327206/
  Full text (PMC): https://pmc.ncbi.nlm.nih.gov/articles/PMC6041198/