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Phototherapy is certainly having a surge in popularity. There are now available glowing gadgets targeting issues like skin conditions and wrinkles along with sore muscles and periodontal issues, the latest being a toothbrush outfitted with tiny red LEDs, marketed by the company as “a major advance for domestic dental hygiene.” Internationally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. There are even infrared saunas available, where instead of hot coals (real or electric) heating the air, the infrared radiation heats your body itself. According to its devotees, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, reducing swelling and long-term ailments as well as supporting brain health.

The Science and Skepticism

“It feels almost magical,” says a Durham University professor, professor in neuroscience at Durham University and a convert to the value of light therapy. Naturally, certain impacts of light on human physiology are proven. Our bodies produce vitamin D through sun exposure, essential for skeletal strength, immune function, and muscular health. Light exposure controls our sleep-wake cycles, as well, stimulating neurotransmitter and hormone production during daytime, and winding down bodily functions for sleep as it fades into night. Artificial sun lamps are standard treatment for winter mood disorders to combat seasonal emotional slumps. Clearly, light energy is essential for optimal functioning.

Various Phototherapy Approaches

Whereas seasonal affective disorder devices typically employ blue-range light, the majority of phototherapy tools use red or near-infrared wavelengths. During advanced medical investigations, such as Chazot’s investigations into the effects of infrared on brain cells, identifying the optimal wavelength is crucial. 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). Therapeutic light application utilizes intermediate light frequencies, including invisible ultraviolet radiation, followed by visible light encompassing rainbow colors and then infrared (which we can see with night-vision goggles).

Dermatologists have utilized UV therapy for extensive periods for addressing long-term dermatological issues like vitiligo. It affects cellular immune responses, “and reduces inflammatory processes,” says Dr Bernard Ho. “Considerable data validates phototherapy.” UVA goes deeper into the skin than UVB, while the LEDs in consumer devices (typically emitting red, infrared or blue wavelengths) “tend to be a bit more superficial.”

Risk Assessment and Professional Supervision

The side-effects of UVB exposure, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – which minimises the risks. “It’s supervised by a healthcare professional, thus exposure is controlled,” says Ho. Essentially, the devices are tuned by qualified personnel, “to guarantee appropriate wavelength emission – different from beauty salons, where oversight might be limited, and we don’t really know what wavelengths are being used.”

Home Devices and Scientific Uncertainty

Red and blue light sources, he says, “aren’t typically employed clinically, but they may help with certain conditions.” Red light devices, some suggest, help boost blood circulation, oxygen utilization and skin cell regeneration, and stimulate collagen production – a primary objective in youth preservation. “The evidence is there,” comments the expert. “But it’s not conclusive.” In any case, amid the sea of devices now available, “it’s unclear if device outputs match study parameters. Optimal treatment times are unknown, proper positioning requirements, if benefits outweigh potential risks. Numerous concerns persist.”

Targeted Uses and Expert Opinions

Early blue-light applications focused on skin microbes, microorganisms connected to breakouts. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – despite the fact that, says Ho, “it’s often seen in medical spas or aesthetics practices.” Certain patients incorporate it into their regimen, he observes, but if they’re buying a device for home use, “we just tell them to try it carefully and to make sure it has been assessed for safety. Unless it’s a medical device, standards are somewhat unclear.”

Cutting-Edge Studies and Biological Processes

At the same time, in a far-flung field of pioneering medical science, scientists have been studying cerebral tissue, discovering multiple mechanisms for infrared’s cellular benefits. “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.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, however two decades past, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He developed equipment for cellular and insect experiments,” he says. “I remained doubtful. The specific wavelength measured approximately 1070nm, which most thought had no biological effect.”

The advantage it possessed, nevertheless, was that it travelled through water easily, enabling deeper tissue 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. “Every cell in your body has mitochondria, even within brain tissue,” notes the researcher, who prioritized neurological investigations. “Research confirms improved brain blood flow with phototherapy, which is always very good.”

With 1070 treatment, energy organelles generate minimal reactive oxygen compounds. In low doses this substance, notes the scientist, “stimulates so-called chaperone proteins which look after your mitochondria, preserve cell function and eliminate damaged proteins.”

All of these mechanisms appear promising for treating a brain disease: oxidative protection, inflammation reduction, and pro-autophagy – autophagy representing cellular waste disposal.

Present Investigation Status and Expert Assessments

When recently reviewing 1070nm research for cognitive decline, he states, approximately 400 participants enrolled in multiple trials, comprising his early research projects