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Light therapy is clearly enjoying a moment. Consumers can purchase light-emitting tools targeting issues like complexion problems and aging signs along with muscle pain and periodontal issues, recently introduced is a dental hygiene device outfitted with small red light diodes, marketed by the company as “a breakthrough in personal mouth health.” 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, which use infrared light to warm the body directly, the infrared radiation heats your body itself. According to its devotees, the experience resembles using an LED facial mask, enhancing collagen production, easing muscle tension, relieving inflammation and long-term ailments and potentially guarding against cognitive decline.

Research and Reservations

“It appears somewhat mystical,” notes a neuroscience expert, who has researched light therapy for two decades. Naturally, we know light influences biological functions. Our bodies produce vitamin D through sun exposure, needed for bone health, immunity, muscles and more. Natural light synchronizes our biological clocks, too, activating brain chemicals and hormonal responses in daylight, and preparing the body for rest as darkness falls. Sunlight-imitating lamps are a common remedy for people with seasonal affective disorder (Sad) to combat seasonal emotional slumps. Clearly, light energy is essential for optimal functioning.

Various Phototherapy Approaches

Whereas seasonal affective disorder devices typically employ blue-range light, the majority of phototherapy tools use red or near-infrared wavelengths. In serious clinical research, including research on infrared’s impact on neural cells, determining the precise frequency is essential. Light constitutes electromagnetic energy, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to high-energy gamma radiation. Light-based treatment employs mid-spectrum wavelengths, with ultraviolet representing the higher energy invisible light, then the visible spectrum we perceive as colors and finally infrared detectable with special equipment.

UV light has been used by medical dermatologists for many years for addressing long-term dermatological issues like vitiligo. It works on the immune system within cells, “and dampens down inflammation,” says Dr Bernard Ho. “Substantial research supports light therapy.” UVA reaches deeper skin layers compared to UVB, while the LEDs in consumer devices (usually producing colored light emissions) “typically have shallower penetration.”

Safety Protocols and Medical Guidance

UVB radiation effects, such as burning or tanning, are understood but clinical devices employ restricted wavelength ranges – signifying focused frequency bands – which decreases danger. “Treatment is monitored by medical staff, so the dosage is monitored,” explains the dermatologist. Most importantly, the devices are tuned by qualified personnel, “to confirm suitable light frequency output – as opposed to commercial tanning facilities, where oversight might be limited, and emission spectra aren’t confirmed.”

Commercial Products and Research Limitations

Red and blue light sources, he explains, “aren’t really used in the medical sense, though they might benefit some issues.” Red LEDs, it is proposed, enhance blood flow, oxygen uptake and cell renewal in the skin, and promote collagen synthesis – a primary objective in youth preservation. “The evidence is there,” says Ho. “But it’s not conclusive.” Nevertheless, amid the sea of devices now available, “we’re uncertain whether commercial devices replicate research conditions. Appropriate exposure periods aren’t established, how close the lights should be to the skin, the risk-benefit ratio. Many uncertainties remain.”

Treatment Areas and Specialist Views

One of the earliest blue-light products targeted Cutibacterium acnes, a microbe associated with acne. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – despite the fact that, explains the specialist, “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 advise cautious experimentation and safety verification. Without proper medical classification, the regulation is a bit grey.”

Cutting-Edge Studies and Biological Processes

Meanwhile, in advanced research areas, Chazot has been experimenting with brain cells, revealing various pathways for light-enhanced cell function. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he says. The numerous reported benefits have generated doubt regarding phototherapy – that claims seem exaggerated. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, 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. This particular frequency was around 1070 nanometers, that many assumed was biologically inert.”

What it did have going for it, though, was its efficient water penetration, allowing substantial bodily penetration.

Mitochondrial Effects and Brain Health

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. These organelles generate cellular energy, producing fuel for biological processes. “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 consistently beneficial.”

With 1070 treatment, mitochondria also produce a small amount of a molecule known as reactive oxygen species. At controlled levels these compounds, says Chazot, “stimulates so-called chaperone proteins which look after your mitochondria, protect cellular integrity and manage defective proteins.”

Such mechanisms indicate hope for cognitive disorders: free radical neutralization, inflammation reduction, and pro-autophagy – autophagy being the process the cell uses to clear unwanted damaging proteins.

Current Research Status and Professional Opinions

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he says, approximately 400 participants enrolled in multiple trials, comprising his early research projects