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Light therapy is clearly enjoying a wave of attention. You can now buy light-emitting tools for everything from dermatological concerns and fine lines along with sore muscles and oral inflammation, the newest innovation is a toothbrush equipped with tiny red LEDs, promoted by the creators as “a breakthrough in at-home oral care.” Internationally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. You can even go and sit in an infrared sauna, that employ light waves rather than traditional heat sources, the thermal energy targets your tissues immediately. Based on supporter testimonials, it’s like bathing in one of those LED-lit beauty masks, enhancing collagen production, soothing sore muscles, alleviating inflammatory responses and chronic health conditions as well as supporting brain health.

Research and Reservations

“It feels almost magical,” says a neuroscience expert, professor in neuroscience at Durham University and a convert to the value of light therapy. Naturally, 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, too, activating brain chemicals and hormonal responses in daylight, and preparing the body for rest as darkness falls. Artificial sun lamps are standard treatment for winter mood disorders to boost low mood in winter. Clearly, light energy is essential for optimal functioning.

Different Light Modalities

Whereas seasonal affective disorder devices typically employ blue-range light, most other light therapy devices deploy red or infrared light. During advanced medical investigations, like examinations of infrared influence on cerebral tissue, identifying the optimal wavelength is crucial. Photons represent electromagnetic waves, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to high-energy gamma radiation. Phototherapy, or light therapy uses wavelengths around the middle of this spectrum, including invisible ultraviolet radiation, followed by visible light encompassing rainbow colors and finally infrared detectable with special equipment.

Dermatologists have utilized UV therapy for extensive periods to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It modulates intracellular immune mechanisms, “and reduces inflammatory processes,” explains a dermatology expert. “Considerable data validates phototherapy.” UVA penetrates skin more deeply than UVB, while the LEDs in consumer devices (typically emitting red, infrared or blue wavelengths) “generally affect surface layers.”

Safety Considerations and Medical Oversight

The side-effects of UVB exposure, like erythema or pigmentation, are recognized but medical equipment uses controlled narrow-band delivery – meaning smaller wavelengths – which decreases danger. “Treatment is monitored by medical staff, thus exposure is controlled,” says Ho. And crucially, the devices are tuned by qualified personnel, “to guarantee appropriate wavelength emission – as opposed to commercial tanning facilities, where regulations may be lax, and we don’t really know what wavelengths are being used.”

Consumer Devices and Evidence Gaps

Colored light diodes, he says, “don’t have strong medical applications, but they may help with certain conditions.” Red light devices, some suggest, improve circulatory function, oxygen utilization and dermal rejuvenation, and activate collagen formation – a primary objective in youth preservation. “Research exists,” says Ho. “Although it’s not strong.” Regardless, amid the sea of devices now available, “we’re uncertain whether commercial devices replicate research conditions. Optimal treatment times are unknown, how close the lights should be to the skin, if benefits outweigh potential risks. There are lots of questions.”

Specific Applications and Professional Perspectives

Initial blue-light devices addressed acne bacteria, microorganisms connected to breakouts. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – even though, says Ho, “it’s frequently employed in beauty centers.” Some of his patients use it as part of their routine, he mentions, however for consumer products, “we recommend careful testing and security confirmation. Without proper medical classification, the regulation is a bit grey.”

Cutting-Edge Studies and Biological Processes

Meanwhile, in a far-flung field of pioneering medical science, scientists have been studying cerebral tissue, 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. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that results appear unrealistic. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, however two decades past, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He created some devices so that we could work with them with cells and with fruit flies,” he recalls. “I remained doubtful. The specific wavelength measured approximately 1070nm, which most thought had no biological effect.”

Its beneficial characteristic, nevertheless, was that it travelled through water easily, enabling deeper tissue penetration.

Cellular Energy and Neurological Benefits

Growing data suggested infrared influenced energy-producing organelles. Mitochondria are the powerhouses of cells, creating power for cellular operations. “All human cells contain mitochondria, particularly in neural cells,” notes the researcher, who concentrated on cerebral applications. “Research confirms improved brain blood flow with phototherapy, which is always very good.”

With 1070 treatment, cellular power plants create limited oxidative molecules. In limited quantities these molecules, explains the expert, “stimulates so-called chaperone proteins which look after your mitochondria, protect cellular integrity and manage defective proteins.”

These processes show potential for neurological conditions: free radical neutralization, swelling control, and pro-autophagy – autophagy being the process the cell uses to clear unwanted damaging proteins.

Ongoing Study Progress and Specialist Evaluations

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he says, about 400 people were taking part in four studies, comprising his early research projects