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Light-based treatment is definitely experiencing a surge in popularity. You can now buy illuminated devices targeting issues like complexion problems and aging signs to sore muscles and gum disease, the newest innovation is an oral care tool outfitted with small red light diodes, marketed by the company as “a major advance in personal mouth health.” Internationally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion 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, the experience resembles using an LED facial mask, boosting skin collagen, soothing sore muscles, alleviating inflammatory responses and persistent medical issues as well as supporting brain health.

Understanding the Evidence

“It sounds a bit like witchcraft,” says a Durham University professor, professor in neuroscience at Durham University and a convert to the value of light therapy. Naturally, we know light influences biological functions. Sunlight enables vitamin D production, needed for bone health, immunity, muscles and more. Light exposure controls our sleep-wake cycles, as well, activating brain chemicals and hormonal responses in daylight, and winding down bodily functions for sleep as it fades into night. Sunlight-imitating lamps frequently help individuals with seasonal depression to boost low mood in winter. Clearly, light energy is essential for optimal functioning.

Different Light Modalities

Although mood lamps generally utilize blue-spectrum frequencies, consumer light therapy products mostly feature red and infrared emissions. During advanced medical investigations, like examinations of infrared influence on cerebral tissue, finding the right frequency is key. Light is a form of electromagnetic radiation, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to the highest-energy (gamma waves). Light-based treatment employs mid-spectrum wavelengths, 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.

Ultraviolet treatment has been employed by skin specialists for decades to manage persistent skin disorders including eczema and psoriasis. It works on the immune system within cells, “and reduces inflammatory processes,” says Dr Bernard Ho. “Substantial research supports light therapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (usually producing colored light emissions) “typically have shallower penetration.”

Risk Assessment and Professional Supervision

The side-effects of UVB exposure, like erythema or pigmentation, are understood but clinical devices employ restricted wavelength ranges – signifying focused frequency bands – which decreases danger. “It’s supervised by a healthcare professional, meaning intensity is regulated,” notes the specialist. And crucially, the devices are tuned by qualified personnel, “to confirm suitable light frequency output – different from beauty salons, where it’s a bit unregulated, and we don’t really know what wavelengths are being used.”

Consumer Devices and Evidence Gaps

Red and blue light sources, he notes, “don’t have strong medical applications, but could assist with specific concerns.” Red LEDs, it is proposed, enhance blood flow, oxygen absorption and dermal rejuvenation, and promote collagen synthesis – a key aspiration in anti-ageing effects. “The evidence is there,” comments the expert. “But it’s not conclusive.” Nevertheless, amid the sea of devices now available, “we’re uncertain whether commercial devices replicate research conditions. We don’t know the duration, how close the lights should be to the skin, whether or not that will increase the risk versus the benefit. There are lots of questions.”

Treatment Areas and Specialist Views

Initial blue-light devices addressed acne bacteria, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – even though, says Ho, “it’s often seen in medical spas or aesthetics practices.” Individuals include it in their skincare practices, he mentions, though when purchasing home devices, “we advise cautious experimentation and safety verification. Unless it’s a medical device, standards are somewhat unclear.”

Advanced Research and Cellular Mechanisms

At the same time, 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. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he states. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that it’s too good to be true. Yet, experimental evidence has transformed his viewpoint.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, however two decades past, a physician creating light-based cold sore therapy requested his biological knowledge. “He designed tools for biological testing,” he explains. “I was pretty sceptical. It was an unusual wavelength of about 1070 nanometres, that nobody believed did anything biological.”

Its beneficial characteristic, nevertheless, was that it travelled through water easily, allowing substantial bodily penetration.

Mitochondrial Impact and Cognitive Support

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. These organelles generate cellular energy, generating energy for them to function. “Mitochondria exist throughout the body, particularly in neural cells,” 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 generally advantageous.”

With specific frequency application, mitochondria also produce a small amount of a molecule known as reactive oxygen species. At controlled levels these compounds, explains the expert, “activates protective proteins that safeguard mitochondria, look after your cells and also deal with the unwanted proteins.”

All of these mechanisms appear promising for treating a brain disease: oxidative protection, inflammation reduction, and pro-autophagy – autophagy being the process the cell uses to clear unwanted damaging proteins.

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, comprising his early research projects