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Phototherapy is definitely experiencing a moment. You can now buy illuminated devices for everything from complexion problems and aging signs as well as aching tissues and periodontal issues, the latest being a dental hygiene device 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, where instead of hot coals (real or electric) heating the air, the thermal energy targets your tissues immediately. According to its devotees, it feels similar to a full-body light therapy session, enhancing collagen production, soothing sore muscles, relieving inflammation and persistent medical issues as well as supporting brain health.

Research and Reservations

“It sounds a bit like witchcraft,” notes a Durham University professor, a scientist who has studied phototherapy extensively. Of course, 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, stimulating neurotransmitter and hormone production during daytime, 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.

Various Phototherapy Approaches

Although mood lamps generally utilize blue-spectrum frequencies, consumer light therapy products mostly feature red and infrared emissions. In serious clinical research, such as Chazot’s investigations into the effects of infrared on brain cells, identifying the optimal wavelength is crucial. Light constitutes electromagnetic energy, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to the highest-energy (gamma waves). Therapeutic light application employs mid-spectrum wavelengths, the highest energy of those being invisible ultraviolet, followed by visible light encompassing rainbow colors and infrared light visible through night vision technology.

UV light has been used by medical dermatologists for many years to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It works on the immune system within cells, “and reduces inflammatory processes,” says a dermatology expert. “There’s lots of evidence for phototherapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (usually producing colored light emissions) “typically have shallower penetration.”

Safety Protocols and Medical Guidance

Potential UVB consequences, like erythema or pigmentation, are understood but clinical devices employ restricted wavelength ranges – meaning smaller wavelengths – which minimises the risks. “Therapy is overseen by qualified practitioners, thus exposure is controlled,” says Ho. Most importantly, the devices are tuned by qualified personnel, “to confirm suitable light frequency output – different from beauty salons, where regulations may be lax, and we don’t really know what wavelengths are being used.”

Commercial Products and Research Limitations

Red and blue light sources, he says, “aren’t typically employed clinically, but could assist with specific concerns.” Red wavelength therapy, proponents claim, enhance blood flow, oxygen utilization and cell renewal in the skin, and promote collagen synthesis – a primary objective in youth preservation. “The evidence is there,” says Ho. “Although it’s not strong.” Nevertheless, with numerous products on the market, “we’re uncertain whether commercial devices replicate research conditions. Optimal treatment times are unknown, ideal distance from skin surface, whether or not that will increase the risk versus the benefit. Many uncertainties remain.”

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 – despite the fact that, says Ho, “it’s commonly used in cosmetic clinics.” Individuals include it in their skincare practices, he observes, though when purchasing home devices, “we just tell them to try it carefully and to make sure it has been assessed for safety. If it’s not medically certified, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

Simultaneously, in innovative scientific domains, scientists have been studying cerebral tissue, revealing various pathways for light-enhanced cell function. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he reports. The numerous reported benefits have generated doubt regarding phototherapy – that claims seem exaggerated. Yet, experimental evidence has transformed his viewpoint.

The scientist mainly develops medications for neurological conditions, though twenty years earlier, a physician creating light-based cold sore therapy requested his biological knowledge. “He created some devices so that we could work with them with cells and with fruit flies,” he says. “I was pretty sceptical. This particular frequency was around 1070 nanometers, that many assumed was biologically inert.”

The advantage it possessed, though, was its ability to transmit through aqueous environments, allowing substantial bodily penetration.

Mitochondrial Impact and Cognitive Support

Additional research indicated infrared affected cellular mitochondria. Mitochondria produce ATP for cell function, producing fuel for biological processes. “Every cell in your body has mitochondria, even within brain tissue,” 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.”

Using 1070nm wavelength, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In low doses this substance, says Chazot, “stimulates so-called chaperone proteins which look after your mitochondria, preserve cell function and eliminate damaged proteins.”

Such mechanisms indicate hope for cognitive disorders: oxidative protection, anti-inflammatory, and cellular cleanup – self-digestion mechanisms eliminating harmful elements.

Ongoing Study Progress and Specialist Evaluations

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he reports, approximately 400 participants enrolled in multiple trials, incorporating his preliminary American studies