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Light-based treatment is definitely experiencing a surge in popularity. There are now available glowing gadgets designed to address skin conditions and wrinkles to muscle pain and periodontal issues, recently introduced is an oral care tool equipped with miniature red light sources, described by its makers as “a breakthrough for domestic dental hygiene.” Worldwide, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. Options include full-body infrared sauna sessions, which use infrared light to warm the body directly, the infrared radiation heats your body itself. Based on supporter testimonials, it feels similar to a full-body light therapy session, boosting skin collagen, easing muscle tension, relieving inflammation and chronic health conditions and potentially guarding against cognitive decline.

The Science and Skepticism

“It sounds a bit like witchcraft,” says a Durham University professor, who has researched light therapy for two decades. Naturally, certain impacts of light on human physiology are proven. Sunlight helps us make vitamin D, crucial for strong bones, immune defense, and tissue repair. Light exposure controls our sleep-wake cycles, too, stimulating neurotransmitter and hormone production during daytime, and signaling the body to slow down for nighttime. Sunlight-imitating 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

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, the majority of phototherapy tools use red or near-infrared wavelengths. In rigorous scientific studies, 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, spanning from low-energy radio waves to high-energy gamma radiation. Phototherapy, or light therapy utilizes intermediate light frequencies, with ultraviolet representing the higher energy invisible light, then the visible spectrum we perceive as colors and then infrared (which we can see with night-vision goggles).

Ultraviolet treatment has been employed by skin specialists for decades to manage persistent skin disorders including eczema and psoriasis. It modulates intracellular immune mechanisms, “and reduces inflammatory processes,” notes a skin specialist. “Substantial research supports light therapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (typically emitting red, infrared or blue wavelengths) “generally affect surface layers.”

Safety Protocols and Medical Guidance

UVB radiation effects, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – which decreases danger. “Therapy is overseen by qualified practitioners, so the dosage is monitored,” explains the dermatologist. Essentially, the lightbulbs are calibrated by medical technicians, “to guarantee appropriate wavelength emission – unlike in tanning salons, where oversight might be limited, and we don’t really know what wavelengths are being used.”

Consumer Devices and Evidence Gaps

Red and blue LEDs, he notes, “aren’t typically employed clinically, but could assist with specific concerns.” Red LEDs, it is proposed, improve circulatory function, oxygen absorption and skin cell regeneration, and promote collagen synthesis – a primary objective in youth preservation. “Research exists,” comments the expert. “Although it’s not strong.” 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. We don’t know the duration, proper positioning requirements, whether or not that will increase the risk versus the benefit. Many uncertainties remain.”

Specific Applications and Professional Perspectives

Early blue-light applications focused on skin microbes, bacteria linked to pimples. 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 commonly used in cosmetic clinics.” Some of his patients use it as part of their routine, he says, 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

Meanwhile, in innovative scientific domains, scientists have been studying cerebral tissue, discovering multiple mechanisms for infrared’s cellular benefits. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” 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. Yet, experimental evidence has transformed his viewpoint.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, though twenty years earlier, 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 was pretty sceptical. This particular frequency was around 1070 nanometers, that nobody believed did anything biological.”

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

Mitochondrial Impact and Cognitive Support

Growing data suggested infrared influenced energy-producing organelles. Mitochondria are the powerhouses of cells, generating energy for them to function. “Mitochondria exist throughout the body, including the brain,” explains the neuroscientist, who concentrated on cerebral applications. “Research confirms improved brain blood flow with phototherapy, which is generally advantageous.”

With 1070 treatment, cellular power plants create limited oxidative molecules. In low doses this substance, says Chazot, “stimulates so-called chaperone proteins which look after your mitochondria, look after your cells and also deal with the unwanted proteins.”

All of these mechanisms appear promising for treating a brain disease: free radical neutralization, inflammation reduction, and cellular cleanup – autophagy representing cellular waste disposal.

Current Research Status and Professional Opinions

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