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Red and Infrared Light Therapy Shown to Improve Wound Healing and Reduce Scarring

Updated: Jul 20

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A peer-reviewed lab study investigated the effects of combining red and near-infrared (NIR) photobiomodulation (PBM) on wound healing in diabetic mice. The results were clear: mice receiving red and NIR light therapy showed significantly better skin remodeling, reduced scarring, and improved markers of tissue repair. Importantly, these improvements were tied to modulated levels of key growth factors like TGF-β1 and TGF-β3, which play critical roles in skin regeneration and fibrosis.


Study Overview


  • Title: Improved Wound Remodeling Correlates with Modulated TGF-β Expression in Skin Diabetic Wounds Following Combined Red and Infrared Photobiomodulation Treatments


  • Quick Summary: This study examined how combined red (660 nm) and infrared (890 nm) PBM affects skin wound healing in diabetic mice. Researchers created identical wounds in all mice and compared healing outcomes between a control group and a group receiving light therapy. The treated group showed faster healing, more organized collagen, and decreased scar formation—pointing to PBM as a non-invasive way to improve wound outcomes in compromised skin.


  • Key Findings:

    • Combined 660 nm and 890 nm light therapy significantly improved wound closure in diabetic mice vs. untreated controls.

    • Collagen fibers were more organized and resembled healthy skin in PBM-treated wounds—suggesting better tissue remodeling.

    • Scarring was visibly reduced, with improved epidermal and dermal structure.

    • TGF-β1 (pro-scarring) expression was significantly reduced, while TGF-β3 (anti-scarring/regenerative) expression was increased, supporting a favorable healing profile.


  • Study Details:

    • Subjects: 12 diabetic mice (6 treated with PBM, 6 untreated controls)

    • Wavelengths Used: 660 nm (red) and 890 nm (infrared)

    • Protocol: Once daily treatment for 5 consecutive days post-wounding

    • Outcome Measures: Tissue histology, wound size, and immunofluorescence for TGF-β1 and TGF-β3

  • Year Published:  2018

  • Where Published:  Photochemistry and Photobiology (Wiley)



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