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Phototherapy is definitely experiencing a moment. You can now buy glowing gadgets designed to address skin conditions and wrinkles as well as muscle pain and oral inflammation, recently introduced is a dental hygiene device enhanced with tiny red LEDs, marketed by the company as “a major advance for domestic dental hygiene.” Internationally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. Options include full-body infrared sauna sessions, where instead of hot coals (real or electric) heating the air, your body is warmed directly by infrared light. Based on supporter testimonials, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, reducing swelling and chronic health conditions while protecting against dementia.

Understanding the Evidence

“It sounds a bit like witchcraft,” observes a neuroscience expert, professor in neuroscience at Durham University and a convert to the value of light therapy. Certainly, some of light’s effects on our bodies are well established. Sunlight enables vitamin D production, needed for bone health, immunity, muscles and more. Light exposure controls our sleep-wake cycles, as well, stimulating neurotransmitter and hormone production during daytime, and signaling the body to slow down for nighttime. Sunlight-imitating lamps frequently help individuals with seasonal depression to boost low mood in winter. So there’s no doubt we need light energy to function well.

Types of Light Therapy

Although mood lamps generally utilize blue-spectrum frequencies, the majority of phototherapy tools use red or near-infrared wavelengths. During advanced medical investigations, such as Chazot’s investigations into the effects of infrared on brain cells, determining the precise frequency is essential. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to short-wavelength gamma rays. Therapeutic light application uses wavelengths around the middle of this spectrum, including invisible ultraviolet radiation, then the visible spectrum we perceive as colors and finally infrared detectable with special equipment.

Dermatologists have utilized UV therapy for extensive periods for addressing long-term dermatological issues like vitiligo. It affects cellular immune responses, “and reduces inflammatory processes,” explains a skin specialist. “Substantial research supports light therapy.” UVA penetrates skin more deeply than UVB, in contrast to LEDs in commercial products (usually producing colored light emissions) “typically have shallower penetration.”

Safety Protocols and Medical Guidance

The side-effects of UVB exposure, including sunburn or skin darkening, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – which decreases danger. “Therapy is overseen by qualified practitioners, meaning intensity is regulated,” says Ho. Most importantly, the lightbulbs are calibrated by medical technicians, “to guarantee appropriate wavelength emission – unlike in tanning salons, where regulations may be lax, and emission spectra aren’t confirmed.”

Commercial Products and Research Limitations

Colored light diodes, he says, “aren’t really used in the medical sense, but could assist with specific concerns.” Red wavelength therapy, proponents claim, help boost blood circulation, oxygen absorption and skin cell regeneration, and stimulate collagen production – an important goal for anti-aging. “The evidence is there,” says Ho. “But it’s not conclusive.” Regardless, with numerous products on the market, “we’re uncertain whether commercial devices replicate research conditions. We don’t know the duration, proper positioning requirements, whether or not that will increase the risk versus the benefit. Numerous concerns persist.”

Targeted Uses and Expert Opinions

Early blue-light applications focused on skin microbes, microorganisms connected to breakouts. Research support isn’t sufficient for standard medical recommendation – although, says Ho, “it’s often seen in medical spas or aesthetics practices.” Individuals include it in their skincare practices, he mentions, but if they’re buying a device for home use, “we advise cautious experimentation and safety verification. Unless it’s a medical device, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

Simultaneously, in innovative scientific domains, Chazot has been experimenting with brain cells, revealing various pathways for light-enhanced cell function. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he states. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that claims seem exaggerated. But his research has thoroughly changed his mind in that respect.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, but over 20 years ago, a physician creating light-based cold sore therapy requested his biological knowledge. “He developed equipment for cellular and insect experiments,” he recalls. “I was pretty sceptical. The specific wavelength measured approximately 1070nm, which most thought had no biological effect.”

What it did have going for it, though, was that it travelled through water easily, enabling deeper tissue penetration.

Cellular Energy and Neurological Benefits

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. Mitochondria produce ATP for cell function, generating energy for them to function. “All human cells contain mitochondria, including the brain,” explains the neuroscientist, who concentrated on cerebral applications. “Research confirms improved brain blood flow with phototherapy, which is consistently beneficial.”

With specific frequency application, energy organelles generate minimal reactive oxygen compounds. At controlled levels these compounds, says Chazot, “activates protective proteins that safeguard mitochondria, look after your cells and also deal with the unwanted proteins.”

These processes show potential for neurological conditions: free radical neutralization, anti-inflammatory, and waste removal – autophagy representing cellular waste disposal.

Present Investigation Status and Expert Assessments

When recently reviewing 1070nm research for cognitive decline, he says, several hundred individuals participated in various investigations, incorporating his preliminary American studies