Photobiomodulation Research Update - May 2026

Photobiomodulation: 30 Studies That Made an Impact in May 2026

Photobiomodulation (PBM) continues to gain prominence in the scientific literature.

For the month of May 2026, our monitoring identified 30 original articles and reviews covering the entire clinical spectrum of therapeutic light: neurology, pain management, supportive oncology, oral health, sports recovery, wound healing, metabolism, and ophthalmology.

Several meta-analyses and randomized controlled trials have strengthened the body of evidence, while mechanistic studies are refining our understanding of the optimal parameters.

Thematic overview.

At Bioledtherapy, we closely follow this research to refine our LED photobiomodulation protocols.

Neurology & Cognition

Neuromodulation of brain networks via prefrontal tPBM. An EEG study in 18 healthy subjects shows that 810 nm transcranial PBM over the right prefrontal cortex increases long-range functional connectivity (delta, theta, beta), while stimulation on the left side acts primarily on the theta band—an argument for personalized tPBM in neuropsychiatric disorders. Li L, Du Z, Wang K et al., Neuroscience, Feb. 2026. DOI: 10.1016/j.neuroscience.2026.02.012

Frequency-specific PBM and cognitive aging. In adult and aged rats, pulsed 810 nm PBM at 5 Hz and 40 Hz improves cognitive flexibility; the gamma frequency (40 Hz) restores learning in aged animals through modulation of neuroinflammation and synaptic plasticity. Arias N, Rodríguez-Fernández L, Zorzo C et al., GeroScience, May 2026. DOI: 10.1007/s11357-026-02278-9

PBM-assisted neuronal differentiation of stem cells. A low fluence (5 J/cm²) at 525 nm promotes the maintenance of adipose-derived stem cells and early neurogenesis, while the 525 + 825 nm combination supports late neuronal maturation—a promising avenue for neuronal regenerative medicine. Mulaudzi PE, Abrahamse H, Crous A, Molecular Neurobiology, May 2026. DOI: 10.1007/s12035-026-05903-y

PBM and Multiple Sclerosis: A Mechanistic Review. According to a PRISMA-compliant synthesis of preclinical and clinical data, PBM improves mitochondrial bioenergetics, exerts anti-inflammatory and antioxidant effects, and modulates neuro-immuno-glial communication, providing a rational basis for its development in MS. Xie L, Zhou S, Jia H et al., International Immunopharmacology, May 2026. DOI: 10.1016/j.intimp.2026.116934

Pain & Rehabilitation

PBM and Fractures: A Systematic Review and Meta-Analysis. In 9 randomized trials, PBM significantly reduced pain 1 week after fracture (MD -0.74) and improved grip strength at 4 weeks (MD +5.03 kg) in upper limb fractures, with no reported adverse effects. Wang W, Xiu R, Zhao X et al., Annals of Medicine, May 2026. DOI: 10.1080/07853890.2026.2667061

Portable low-level laser therapy applied to acupoint GV20 for headache relief. In a randomized, triple-blind trial, a portable 650-nm LLLT device applied to Baihui and Sishencong significantly reduced temporal pain compared to a sham treatment, demonstrating the viability of portable PBM devices. Lei WF, Sadiq A, Cui ZY et al., Lasers in Medical Science, May 2026. DOI: 10.1007/s10103-026-04877-6

Plantar fasciitis: LLLT among validated adjunctive treatments. A network meta-analysis of 24 randomized trials (1,240 patients) ranks LLLT among the top three adjunctive interventions providing clinically significant pain relief in the short term (MD -1.54). Li Z, He S, Wu J et al., Physical Therapy, May 2026. DOI: 10.1093/ptj/pzag056

Low back pain: PBM combined with mechanical systems. A randomized, placebo-controlled trial (laser alone, or combined with vacuum therapy, foam rolling, or ultrasound) reports a reduction in pain and improvements in isometric strength, flexibility, and mobility, particularly when the therapies are combined. Santos ATS, Terra AMSV, Parizotto NA et al., Journal of Biophotonics, June 2026. DOI: 10.1002/jbio.70299

Postpartum perineal injuries: no added benefit. A systematic review with meta-analysis (9 studies) found no evidence that far-infrared therapy or LLLT is superior to conventional care for perineal pain and healing after childbirth—a useful reminder of the importance of parameters and indications. Santos Vanzella JS, Fitz FF, Aquino Castro R et al., International Urogynecology Journal, May 2026. DOI: 10.1007/s00192-026-06601-y

Oncology & Supportive Care

Chemotherapy- and radiation-induced oral mucositis: efficacy confirmed. A meta-analysis of 7 randomized trials (329 patients) confirms the high efficacy of PBM in reducing the incidence and severity of oral mucositis (RR 0.50; 95% CI 0.35–0.73), predominantly at 660 nm—reinforcing PBM as the standard of care for supportive oncology. Rojas G, Escalante-Parra R, Duarte A et al., Supportive Care in Cancer, May 2026. DOI: 10.1007/s00520-026-10729-4

Oncological safety of low-frequency PBM. An in vitro study on gingival and dermal fibroblasts and MCF-7 cancer cells (808 nm laser, 2–3 J/cm²) shows that PBM at conservative doses preserves fibroblast homeostasis without inducing excessive proliferation of cancer cells—a safety argument for adjuvant protocols. Real-Lopez DA, Garcia-Niño de Rivera MW, Chavez-Granados PA et al., Lasers in Medical Science, May 2026. DOI: 10.1007/s10103-026-04887-4

Oral Health & Periodontology

Mandibular fractures: PBM + T-PRF synergy. In a randomized pilot study (12 patients), the addition of LLLT to T-PRF following osteosynthesis increased bone density at 12 weeks and reduced pain during the first two weeks. Elyamany AH, Oraby MS, Noureldin MG, BMC Oral Health, May 2026. DOI: 10.1186/s12903-026-08455-8

Peri-implantitis: Er:YAG laser + PBM. A randomized trial (45 patients) demonstrates the superiority of the Er:YAG + PBM combination over debridement alone at 3 months: reduction in pocket depth (-2.30 vs. -1.45 mm), bleeding, and a success rate of 81% vs. 42%. Neophytou C, Sakellari D, Vouros I et al., Photobiomodulation, Photomedicine, and Laser Surgery, May 2026. DOI: 10.1177/25785478261447960

Third Molar Extraction: LED vs. Laser. A randomized split-mouth trial (72 patients) comparing 810 nm LLLT, 618 nm LED, and their combination shows that LED is more effective for early pain control and late-stage edema reduction. Albayrak D, Bulut E, Singer EA, Lasers in Medical Science, May 2026. DOI: 10.1007/s10103-025-04796-y

660 nm red LED behind the third molar. A randomized, double-blind trial (42 patients) confirms an improvement in mouth opening, pain, and analgesic use on days 2 and 4, with no effect on swelling. de Andrade Hage C, Almeida Alves MS, de Lima Luna CA et al., International Journal of Oral and Maxillofacial Surgery, May 2026. DOI: 10.1016/j.ijom.2026.04.004

TMJ: Ceiling effect of adjunctive LLLT. In a randomized trial (40 patients) on TMJ dysfunction, adjunctive LLLT provided no additional benefit beyond joint aspiration plus hyaluronic acid—a reminder that the dose and context determine the effect. Bahaa M, Azab AMFA, Elfarmawy MA, Morsi HO, Oral and Maxillofacial Surgery, May 2026. DOI: 10.1007/s10006-026-01573-1

Alveolar bone regeneration: laser + GBR. In rats with severe periodontitis, the combination of Er,Cr:YSGG laser therapy and guided bone regeneration increases bone volume and density by activating the Wnt/β-catenin pathway. Guo Y, Wang Y, Kong L et al., Lasers in Medical Science, May 2026. DOI: 10.1007/s10103-026-04885-6

MRONJ: International Consensus Recommendations. A WFLD & PTSL meta-analysis of 14 systematic reviews links PBM to reduced pain and improved soft tissue healing in drug-induced osteonecrosis of the jaw, particularly when used as part of a multimodal strategy—a useful reference for cancer patients receiving antiresorptive agents. Grzech-Leśniak K, Wiench R, Shibli JA et al., Dental and Medical Problems, May 2026. DOI: 10.17219/dmp/220709

Sports & Muscle Recovery

CrossFit: PBM + static magnetic field. A randomized crossover trial shows that PBMT-sMF improves performance on the countermovement jump at 24 and 48 hours, reduces LDH, and favorably modulates oxidative stress, compared to passive recovery, pneumatic compression, and shockwave therapy. Martins PHGN, Tomazoni SS, Leal-Junior ECP et al., PLoS One, May 2026. DOI: 10.1371/journal.pone.0349880

Chronic kidney disease: negative results from a single treatment. A double-blind crossover trial (830 nm laser) involving 14 hemodialysis patients showed no improvement in quadriceps strength, fatigue, or pain after a single session—suggesting that repeated and tailored treatment protocols are needed for this vulnerable population. Barbosa APO, Plentz RDM, Schardong J et al., Lasers in Medical Science, May 2026. DOI: 10.1007/s10103-026-04886-5

Glucocorticoid-induced muscle atrophy. In C2C12 myoblasts exposed to dexamethasone, 780 nm PBM partially attenuates the loss of viability, reduced myogenic fusion, and decreased cell migration, and modulates IL-6 and TNF-α—data relevant to muscle recovery and long-term corticosteroid therapy. da Silva Martins AL, Malavazzi TCDS, de Siqueira E Silva RT et al., Scientific Reports, May 2026. DOI: 10.1038/s41598-026-52078-6

Wound healing, metabolism, and tissue repair

Optimization of LLLT parameters on fibroblasts. An in vitro study identifies optimal parameters (200 mW × 2 J/cm² or 100 mW × 10 J/cm²) that increase fibroblast adhesion and migration, reduce IL-6/IL-8, and modulate MMP-2/MMP-9—a useful parametric framework for skin healing. Ścisłowska-Czarnecka A, Lizak A, Matuła A et al., Lasers in Medical Science, May 2026. DOI: 10.1007/s10103-026-04873-w

Diabetic wound: dermal scaffold + PBM. In type 2 diabetic rats, the combination of a decellularized dermal scaffold and PBM accelerates wound contraction, improves biomechanical properties, stimulates angiogenesis (VEGF, TGF-β1), and reduces pro-inflammatory cytokines. Qahl SH, Bakheet RS, Ghouth NM et al., Histochemistry and Cell Biology, May 2026. DOI: 10.1007/s00418-026-02484-8

630 nm red LED and osteoblastic metabolism. An in vitro study demonstrates dose-dependent effects of 630 nm PBM on cell migration, collagen synthesis, and alkaline phosphatase activity, reinforcing the rationale for selecting LED parameters for bone regeneration. Moreira FC, Ribeiro MS, Costa CAS et al., Photochemistry and Photobiology, May 2026. DOI: 10.1111/php.70111

PBM and insulin resistance (sleep apnea model). A French team (INSERM, Grenoble) demonstrates in mice that 630 nm PBM attenuates insulin resistance induced by intermittent hypoxia, restores insulin signaling in adipose tissue, and limits hepatic oxidative stress—a novel metabolic approach for OSA comorbidities. Paradis S, Blachot-Minassian B, Bouyon S et al., Comprehensive Physiology, June 2026. DOI: 10.1002/cph4.70152

Ophthalmology & Myopia Management

Repeated red light therapy and myopia control. A meta-analysis (8 studies) shows that repeated red light therapy combined with orthokeratology or DIMS lenses reduces axial length, slows refractive progression, and increases choroidal thickness in myopic children, starting at 1 month and continuing up to 12 months. Zhang N, You Y, Li R, Shi B, Photodiagnosis and Photodynamic Therapy, May 2026. DOI: 10.1016/j.pdpdt.2026.105512

Management of myopia in China. A review includes low-level repeated red light among the primary interventions for myopia prevention, confirming its growing adoption in international clinical algorithms. Chen L, Sun L, Leung HY et al., Eye & Contact Lens, May 2026. DOI: 10.1097/ICL.0000000000001282

Ocular surface after cataract surgery. A double-blind randomized trial shows that post-cataract LLLT improves the ocular surface in 44.2% of patients (vs. 4.4% in the sham group), with increased levels of repair and neurotrophic markers (GDF-15, PDGF-CC, β-NGF)—linking the clinical effect of light to objective biomarkers. Timofte-Zorila MM, Pavel-Tanasa M, Giannaccare G et al., Scientific Reports, May 2026. DOI: 10.1038/s41598-026-53521-4

Dermatology

Fluorescence PBM in canine keratinocytes. A veterinary in vitro study describes a mild anti-inflammatory effect of fluorescence PBM (decrease in IP-10) without cytotoxicity or direct antimicrobial effects—useful for the comparative positioning of PBM technologies. Lundberg AT, White A, Archer L, Santoro D, Veterinary Dermatology, May 2026. DOI: 10.1111/vde.70076

Plasma cell gingivitis: PBM + immunomodulation synergy. A clinical case illustrates the benefits of combining PBM with immunomodulatory treatment in chronic plasma cell gingivitis, expanding the mucosal and inflammatory indications for PBM. Hurtado J, Meza V, Valenzuela F, Mujica I, Anais Brasileiros de Dermatologia, May 2026. DOI: 10.1016/j.abd.2026.501354

In summary

May 2026 confirms two key trends: first, the consolidation of the level of evidence through meta-analyses (fractures, oral mucositis, myopia, plantar fasciitis); second, the expansion of PBM indications into the fields of metabolism, neurology, and regenerative medicine. The negative results (TMJ, hemodialysis, postpartum perineum) serve as a reminder that efficacy depends closely on parameters, dosages, and the clinical context—a central challenge for the development of rigorous protocols.

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Sources: publications indexed in PubMed/NCBI (May 2026). Each study is cited in PubMed and includes its DOI.