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Light-based treatment is clearly enjoying a moment. There are now available light-emitting tools designed to address complexion problems and aging signs as well as sore muscles and periodontal issues, the newest innovation is an oral care tool outfitted with miniature red light sources, described by its makers as “a major advance for domestic dental hygiene.” Worldwide, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. Options include full-body infrared sauna sessions, where instead of hot coals (real or electric) heating the air, the thermal energy targets your tissues immediately. According to its devotees, it feels similar to a full-body light therapy session, boosting skin collagen, relaxing muscles, relieving inflammation and long-term ailments as well as supporting brain health.

The Science and Skepticism

“It appears somewhat mystical,” observes a Durham University professor, who has researched light therapy for two decades. Certainly, certain impacts of light on human physiology are proven. Our bodies produce vitamin D through sun exposure, essential for skeletal strength, immune function, and muscular health. Light exposure controls our sleep-wake cycles, too, triggering the release of neurochemicals and hormones while we are awake, and signaling the body to slow down for nighttime. Sunlight-imitating lamps are a common remedy for people with seasonal affective disorder (Sad) to elevate spirits during colder months. So there’s no doubt we need light energy to function well.

Different Light Modalities

Whereas seasonal affective disorder devices typically employ blue-range light, consumer light therapy products mostly feature red and infrared emissions. In rigorous scientific studies, including research on infrared’s impact on neural cells, identifying the optimal wavelength is crucial. Light is a form of electromagnetic radiation, spanning from low-energy radio waves to the highest-energy (gamma waves). Light-based treatment uses wavelengths around the middle of this spectrum, the highest energy of those being invisible ultraviolet, followed by visible light encompassing rainbow colors and then infrared (which we can see with night-vision goggles).

Ultraviolet treatment has been employed by skin specialists for decades to manage persistent skin disorders including eczema and psoriasis. It modulates intracellular immune mechanisms, “and suppresses swelling,” explains a skin specialist. “Substantial research supports light therapy.” UVA reaches deeper skin layers compared to UVB, in contrast to LEDs in commercial products (which generally deliver red, infrared or blue light) “generally affect surface layers.”

Risk Assessment and Professional Supervision

The side-effects of UVB exposure, like erythema or pigmentation, are well known but in medical devices the light is delivered in a “narrow-band” form – signifying focused frequency bands – that reduces potential hazards. “Treatment is monitored by medical staff, so the dosage is monitored,” explains the dermatologist. And crucially, the devices are tuned by qualified personnel, “to ensure that the wavelength that’s being delivered is fit for purpose – different from beauty salons, where oversight might be limited, and emission spectra aren’t confirmed.”

Home Devices and Scientific Uncertainty

Red and blue light sources, he notes, “don’t have strong medical applications, but they may help with certain conditions.” Red LEDs, it is proposed, enhance blood flow, oxygen utilization and cell renewal in the skin, and promote collagen synthesis – a primary objective in youth preservation. “Studies are available,” says Ho. “But it’s not conclusive.” In any case, given the plethora of available tools, “we’re uncertain whether commercial devices replicate research conditions. We don’t know the duration, proper positioning requirements, the risk-benefit ratio. Numerous concerns persist.”

Specific Applications and Professional Perspectives

Early blue-light applications focused on skin microbes, bacteria linked to pimples. Research support isn’t sufficient for standard medical recommendation – despite the fact that, says Ho, “it’s often seen in medical spas or aesthetics practices.” Some of his patients use it as part of their routine, he observes, though when purchasing home devices, “we recommend careful testing and security confirmation. Unless it’s a medical device, oversight remains ambiguous.”

Innovative Investigations and Molecular Effects

Simultaneously, in advanced research areas, researchers have been testing neural cells, identifying a number of ways in which infrared can boost cellular health. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he reports. Multiple claimed advantages have created skepticism toward light treatment – 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 doctor developing photonic antiviral treatment consulted his scientific background. “He developed equipment for cellular and insect experiments,” he explains. “I was pretty sceptical. This particular frequency was around 1070 nanometers, that nobody believed did anything biological.”

What it did have going for it, however, was that it travelled through water easily, meaning it could penetrate the body more deeply.

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, creating power for cellular operations. “Every cell in your body has mitochondria, even within brain tissue,” notes the researcher, who, as a neuroscientist, decided to focus the research on brain cells. “Studies demonstrate enhanced cerebral circulation with light treatment, which is always very good.”

With specific frequency application, cellular power plants create limited oxidative molecules. In limited quantities these molecules, explains the expert, “activates protective proteins that safeguard mitochondria, look after your cells and also deal with the unwanted proteins.”

These processes show potential for neurological conditions: oxidative protection, anti-inflammatory, and waste removal – self-digestion mechanisms eliminating harmful elements.

Present Investigation Status and Expert Assessments

When recently reviewing 1070nm research for cognitive decline, he says, several hundred individuals participated in various investigations, including his own initial clinical trials in the US