Light is more than illumination - it’s a biological signal that directly interacts with human physiology.

In this episode of The Dr. Kumar Discovery, Dr. Ravi Kumar speaks with Dr. Jason Rountree, an expert in clinical photobiomodulation, about how red and near-infrared light therapy influences cellular metabolism, inflammation, and tissue regeneration.

The conversation begins at the mitochondrial level, where specific wavelengths of light, particularly in the 650–1,064 nanometer range, are absorbed by cytochrome c oxidase within the electron transport chain. This interaction can increase ATP production, improve cellular signaling, and restore metabolic function in damaged or energy-depleted tissues.

Dr. Rountree explains how this mechanism has translated into clinical applications for chronic pain, musculoskeletal injuries, wound healing, and skin rejuvenation. By temporarily increasing nitric oxide release and improving microcirculation, photobiomodulation may accelerate tissue repair while reducing inflammation and pain signaling.

The discussion then expands into neurological applications. Transcranial photobiomodulation, which delivers near-infrared light through the skull, is being explored as a potential intervention for neurodegenerative diseases such as Alzheimer’s. Early research suggests that targeted light exposure may reduce neuroinflammation, improve cerebral blood flow, and enhance glymphatic clearance - mechanisms that support cognitive function and brain health.

Throughout the conversation, Dr. Rountree provides practical guidance on evaluating consumer devices. With many inexpensive products flooding the market, he explains how wavelength accuracy, energy density, and clinical testing determine whether a device delivers therapeutic results or simply expensive placebo.

At its core, this episode reframes light as a biological tool: one capable of modulating mitochondrial function, improving tissue resilience, and potentially reshaping how we approach chronic disease and recovery.

What You’ll Learn:

• Why red and near-infrared wavelengths are absorbed by cytochrome c oxidase and how this interaction boosts ATP production and cellular energy.
• How photobiomodulation increases nitric oxide signaling, improves microcirculation, and accelerates tissue repair while reducing pain.
• How high-intensity clinical lasers combined with home LED therapy can improve musculoskeletal injuries, arthritis, and post-surgical recovery.
• How near-infrared light penetrates the skull, reduces neuroinflammation, and may improve cognitive performance in early neurodegenerative disease.
• Why emerging research shows that treating both the brain and gut with photobiomodulation may influence microbiome health and neurological outcomes.
• What wavelength, power density, and clinical validation to look for when selecting a home light therapy system and why many cheap devices fail to deliver therapeutic light.

Dr. Jason Rountree is a chiropractor and clinical expert in photobiomodulation with extensive experience in laser therapy and regenerative medicine. He is a 2010 graduate of Logan College of Chiropractic and serves as the Clinic Director of Montana Laser and Medical Center, an integrative regenerative medicine clinic that performs more than 10,000 laser therapy treatments annually.

As the founder of the Laser Therapy Institute, he has trained hundreds of healthcare professionals in the clinical use of laser and light therapies, helping practitioners integrate photobiomodulation into evidence-based treatment protocols.

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Episode Highlights:

• [00:00:00] – Intro
• [00:02:42] – How Light Was Discovered To Affect Human Biology
• [00:06:04] – The Cellular Mechanisms Behind Red And Infrared Light
• [00:12:53] – Tissue Healing, Skin Rejuvenation, And Collagen Production
• [00:22:15] – Hair Loss, Follicle Reactivation, And Scalp Health
• [00:25:25] – Using Light Therapy For Pain, Arthritis, And Inflammation
• [00:36:35] – LEDs Vs. Lasers And How Light Is Applied Clinically
• [00:52:54] – Transcranial Photobiomodulation For Brain Health And Dementia
• [01:10:47] – The Gut-Brain Connection And Light Therapy For The Microbiome
• [01:15:50] – How To Choose A Red Light Device And Final Takeaways

Episode Resources:

• Dr. Jason Rountree on LinkedIn
• Laser Therapy Institute - Website
• Dr. Ravi Kumar’s Website
• Dr. Ravi Kumar on LinkedIn