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Light therapy is certainly having a surge in popularity. You can now buy light-emitting tools for everything from dermatological concerns and fine lines along with sore muscles and gum disease, the latest being a dental hygiene device equipped with small red light diodes, marketed by the company as “a significant discovery in personal mouth health.” 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, that employ light waves rather than traditional heat sources, the thermal energy targets your tissues immediately. According to its devotees, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, alleviating inflammatory responses and long-term ailments and potentially guarding against cognitive decline.

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. Certainly, some of light’s effects on our bodies are well established. Sunlight helps us make vitamin D, essential for skeletal strength, immune function, and muscular health. 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. Artificial sun lamps are standard treatment for winter mood disorders to boost low mood in winter. Clearly, light energy is essential for optimal functioning.

Types of Light Therapy

Although mood lamps generally utilize blue-spectrum frequencies, consumer light therapy products mostly feature red and infrared emissions. In rigorous scientific studies, such as Chazot’s investigations into the effects of infrared on brain cells, identifying the optimal wavelength is crucial. Light constitutes electromagnetic energy, extending from long-wavelength radiation to high-energy gamma radiation. 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).

UV light has been used by medical dermatologists for many years to manage persistent skin disorders including eczema and psoriasis. It works on the immune system within cells, “and reduces inflammatory processes,” notes a skin specialist. “Substantial research supports light therapy.” UVA goes deeper into the skin than UVB, while the LEDs in consumer devices (which generally deliver red, infrared or blue light) “tend to be a bit more superficial.”

Safety Protocols and Medical Guidance

Potential UVB consequences, including sunburn or skin darkening, are well known but in medical devices the light is delivered in a “narrow-band” form – signifying focused frequency bands – which minimises the risks. “Treatment is monitored by medical staff, meaning intensity is regulated,” explains the dermatologist. And crucially, the devices are tuned by qualified personnel, “to guarantee appropriate wavelength emission – unlike in tanning salons, where it’s a bit unregulated, and emission spectra aren’t confirmed.”

Consumer Devices and Evidence Gaps

Colored light diodes, he explains, “don’t have strong medical applications, but could assist with specific concerns.” Red light devices, some suggest, help boost blood circulation, oxygen uptake and skin cell regeneration, and promote collagen synthesis – a key aspiration in anti-ageing effects. “Studies are available,” says Ho. “But it’s not conclusive.” In any case, 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, ideal distance from skin surface, whether or not that will increase the risk versus the benefit. There are lots of questions.”

Specific Applications and Professional Perspectives

Early blue-light applications focused on skin microbes, 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.” Individuals include it in their skincare practices, he mentions, however for consumer products, “we just tell them to try it carefully and to make sure it has been assessed for safety. Without proper medical classification, standards are somewhat unclear.”

Innovative Investigations and Molecular Effects

Simultaneously, in innovative scientific domains, scientists have been studying cerebral tissue, revealing various pathways for light-enhanced cell function. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he says. The numerous reported benefits have generated doubt regarding phototherapy – that results appear unrealistic. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, but over 20 years ago, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He designed tools for biological testing,” he explains. “I was pretty sceptical. The specific wavelength measured approximately 1070nm, that nobody believed did anything biological.”

The advantage it possessed, however, was its efficient water penetration, meaning it could penetrate the body more deeply.

Mitochondrial Impact and Cognitive Support

Growing data suggested infrared influenced energy-producing organelles. Mitochondria produce ATP for cell function, creating power for cellular operations. “Mitochondria exist throughout the body, including the brain,” says Chazot, who, as a neuroscientist, decided to focus the research on brain cells. “It has been shown that in humans this light therapy increases blood flow into the brain, which is consistently beneficial.”

With 1070 treatment, energy organelles generate minimal reactive oxygen compounds. At controlled levels these compounds, notes the scientist, “activates protective proteins that safeguard mitochondria, protect cellular integrity and manage defective proteins.”

Such mechanisms indicate hope for cognitive disorders: oxidative protection, swelling control, and waste removal – self-digestion mechanisms eliminating harmful elements.

Present Investigation Status and Expert Assessments

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he says, several hundred individuals participated in various investigations, incorporating his preliminary American studies