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Light therapy is certainly having a wave of attention. You can now buy glowing gadgets designed to address complexion problems and aging signs to sore muscles and periodontal issues, recently introduced is a dental hygiene device outfitted with tiny red LEDs, promoted by the creators as “a significant discovery for domestic dental hygiene.” Globally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. There are even infrared saunas available, where instead of hot coals (real or electric) heating the air, the thermal energy targets your tissues immediately. Based on supporter testimonials, it feels similar to a full-body light therapy session, boosting skin collagen, relaxing muscles, relieving inflammation and persistent medical issues while protecting against dementia.

Research and Reservations

“It feels almost magical,” observes a Durham University professor, professor in neuroscience at Durham University and a convert to the value of light therapy. Of course, we know light influences biological functions. Sunlight helps us make vitamin D, needed for bone health, immunity, muscles and more. 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. Artificial sun lamps are a common remedy for people with seasonal affective disorder (Sad) to boost low mood in winter. Undoubtedly, light plays a vital role in human health.

Various Phototherapy Approaches

Whereas seasonal affective disorder devices typically employ blue-range light, consumer light therapy products mostly feature red and infrared emissions. In rigorous scientific studies, like examinations of infrared influence on cerebral tissue, identifying the optimal wavelength is crucial. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to short-wavelength gamma rays. Light-based treatment utilizes intermediate light frequencies, the highest energy of those being invisible ultraviolet, then visible light (all the colours we see in a rainbow) and finally infrared detectable with special equipment.

Dermatologists have utilized UV therapy for extensive periods to manage persistent skin disorders including eczema and psoriasis. It affects cellular immune responses, “and reduces inflammatory processes,” says Dr Bernard Ho. “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) “typically have shallower penetration.”

Safety Considerations and Medical Oversight

UVB radiation effects, like erythema or pigmentation, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – that reduces potential hazards. “Treatment is monitored by medical staff, meaning intensity is regulated,” says Ho. Essentially, the lightbulbs are calibrated by medical technicians, “to confirm suitable light frequency output – different from beauty salons, where it’s a bit unregulated, and wavelength accuracy isn’t verified.”

Commercial Products and Research Limitations

Red and blue LEDs, 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 uptake and skin cell regeneration, and promote collagen synthesis – an important goal for anti-aging. “The evidence is there,” comments the expert. “However, it’s limited.” Regardless, with numerous products on the market, “we don’t know whether or not the lights emitted are reflective of the research that has been done. Optimal treatment times are unknown, proper positioning requirements, the risk-benefit ratio. There are lots of questions.”

Specific Applications and Professional Perspectives

One of the earliest blue-light products targeted Cutibacterium acnes, microorganisms connected to breakouts. Scientific backing remains inadequate for regular prescription – even though, says Ho, “it’s frequently employed in beauty centers.” Individuals include it in their skincare practices, he says, however for consumer products, “we recommend careful testing and security confirmation. If it’s not medically certified, oversight remains ambiguous.”

Innovative Investigations and Molecular Effects

Meanwhile, in innovative scientific domains, scientists have been studying cerebral tissue, identifying a number of ways in which infrared can boost cellular health. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he says. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that claims seem exaggerated. However, scientific investigation has altered his perspective.

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 designed tools for biological testing,” he recalls. “I was quite suspicious. The specific wavelength measured approximately 1070nm, that nobody believed did anything biological.”

Its beneficial characteristic, though, was its efficient water penetration, meaning it could penetrate the body more deeply.

Cellular Energy and Neurological Benefits

Growing data suggested infrared influenced energy-producing organelles. These organelles generate cellular energy, producing fuel for biological processes. “Every cell in your body has mitochondria, including the brain,” notes the researcher, who prioritized neurological investigations. “It has been shown that in humans this light therapy increases blood flow into the brain, which is generally advantageous.”

Using 1070nm wavelength, cellular power plants create limited oxidative molecules. In limited quantities these molecules, explains the expert, “triggers guardian proteins that maintain organelle health, look after your cells and also deal with the unwanted proteins.”

All of these mechanisms appear promising for treating a brain disease: free radical neutralization, inflammation reduction, and waste removal – self-digestion mechanisms eliminating harmful elements.

Current Research Status and Professional Opinions

When recently reviewing 1070nm research for cognitive decline, he says, about 400 people were taking part in four studies, including his own initial clinical trials in the US