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Light therapy is certainly having a moment. You can now buy illuminated devices for everything from complexion problems and aging signs along with aching tissues and gum disease, recently introduced is an oral care tool equipped with tiny red LEDs, marketed by the company as “a breakthrough in at-home oral care.” 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, your body is warmed directly by infrared light. According to its devotees, the experience resembles using an LED facial mask, enhancing collagen production, easing muscle tension, alleviating inflammatory responses and persistent medical issues while protecting against dementia.

The Science and Skepticism

“It feels almost magical,” observes a Durham University professor, who has researched light therapy for two decades. Naturally, some of light’s effects on our bodies are well established. Our bodies produce vitamin D through sun exposure, crucial for strong bones, immune defense, and tissue repair. Light exposure controls our sleep-wake cycles, additionally, triggering the release of neurochemicals and hormones while we are awake, and signaling the body to slow down for nighttime. Artificial sun lamps are a common remedy for people with seasonal affective disorder (Sad) to boost low mood in winter. Undoubtedly, light plays a vital role in human health.

Various Phototherapy Approaches

Whereas seasonal affective disorder devices typically employ blue-range light, most other light therapy devices deploy red or infrared light. In serious clinical research, such as Chazot’s investigations into the effects of infrared on brain cells, determining the precise frequency is essential. Photons represent electromagnetic waves, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to short-wavelength gamma rays. Therapeutic light application utilizes intermediate light frequencies, the highest energy of those being invisible ultraviolet, then the visible spectrum we perceive as colors and infrared light visible through night vision technology.

Ultraviolet treatment has been employed by skin specialists for decades to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It works on the immune system within cells, “and suppresses swelling,” notes 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 (which generally deliver red, infrared or blue light) “typically have shallower penetration.”

Safety Considerations and Medical Oversight

Potential UVB consequences, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – which minimises the risks. “Therapy is overseen by qualified practitioners, so the dosage is monitored,” notes the specialist. And crucially, the lightbulbs are calibrated by medical technicians, “to confirm suitable light frequency output – unlike in tanning salons, where regulations may be lax, and wavelength accuracy isn’t verified.”

Consumer Devices and Evidence Gaps

Colored light diodes, he notes, “don’t have strong medical applications, though they might benefit some issues.” Red light devices, some suggest, help boost blood circulation, oxygen utilization and dermal rejuvenation, and activate collagen formation – a key aspiration in anti-ageing effects. “The evidence is there,” comments the expert. “Although it’s not strong.” Regardless, given the plethora of available tools, “we don’t know whether or not the lights emitted are reflective of the research that has been done. Optimal treatment times are unknown, proper positioning requirements, if benefits outweigh potential risks. There are lots of questions.”

Targeted Uses and Expert Opinions

One of the earliest blue-light products targeted Cutibacterium acnes, bacteria linked to pimples. Research support isn’t sufficient for standard medical recommendation – even though, says Ho, “it’s frequently employed in beauty centers.” Individuals include it in their skincare practices, he says, though when purchasing home devices, “we advise cautious experimentation and safety verification. Without proper medical classification, standards are somewhat unclear.”

Cutting-Edge Studies and Biological Processes

Meanwhile, in innovative scientific domains, Chazot has been experimenting with brain cells, discovering multiple mechanisms for infrared’s cellular benefits. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he states. Multiple claimed advantages have created skepticism toward light treatment – that results appear unrealistic. Yet, experimental evidence has transformed his viewpoint.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, however two decades past, a doctor developing photonic antiviral treatment consulted his scientific background. “He created some devices so that we could work with them with cells and with fruit flies,” he recalls. “I remained doubtful. It was an unusual wavelength of about 1070 nanometres, which most thought had no biological effect.”

What it did have going for it, nevertheless, was that it travelled through water easily, allowing substantial bodily penetration.

Mitochondrial Effects and Brain Health

Additional research indicated infrared affected cellular mitochondria. Mitochondria produce ATP for cell function, creating power for cellular operations. “All human cells contain mitochondria, even within brain tissue,” notes the researcher, who concentrated on cerebral applications. “Research confirms improved brain blood flow with phototherapy, which is generally advantageous.”

With specific frequency application, energy organelles generate minimal reactive oxygen compounds. In low doses this substance, notes the scientist, “triggers guardian proteins that maintain organelle health, preserve cell function and eliminate damaged proteins.”

All of these mechanisms appear promising for treating a brain disease: oxidative protection, inflammation reduction, and waste removal – 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 states, several hundred individuals participated in various investigations, comprising his early research projects