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Light-based treatment is clearly enjoying a moment. There are now available glowing gadgets designed to address skin conditions and wrinkles to aching tissues and oral inflammation, the newest innovation is a dental hygiene device equipped with tiny red LEDs, 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. You can even go and sit in an infrared sauna, which use infrared light to warm the body directly, the infrared radiation heats your body itself. According to its devotees, the experience resembles using an LED facial mask, enhancing collagen production, soothing sore muscles, reducing swelling and persistent medical issues as well as supporting brain health.

The Science and Skepticism

“It feels almost magical,” notes Paul Chazot, who has researched light therapy for two decades. Certainly, certain impacts of light on human physiology are proven. Sunlight enables vitamin D production, needed for bone health, immunity, muscles and more. Sunlight regulates our circadian rhythms, as well, stimulating neurotransmitter and hormone production during daytime, 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. So there’s no doubt we need light energy to function well.

Various Phototherapy Approaches

Whereas seasonal affective disorder devices typically employ blue-range light, consumer light therapy products mostly feature red and infrared emissions. In rigorous scientific studies, like examinations of infrared influence on cerebral tissue, finding the right frequency is key. Photons represent electromagnetic waves, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to the highest-energy (gamma waves). Phototherapy, or light therapy utilizes intermediate light frequencies, with ultraviolet representing the higher energy invisible light, 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 treat chronic skin conditions such as eczema, psoriasis and vitiligo. It affects cellular immune responses, “and reduces inflammatory processes,” explains a skin specialist. “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.”

Safety Considerations and Medical Oversight

UVB radiation effects, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – indicating limited wavelength spectrum – which minimises the risks. “Therapy is overseen by qualified practitioners, meaning intensity is regulated,” explains the dermatologist. Essentially, the lightbulbs are calibrated by medical technicians, “to ensure that the wavelength that’s being delivered is fit for purpose – as opposed to commercial tanning facilities, where it’s a bit unregulated, and wavelength accuracy isn’t verified.”

Consumer Devices and Evidence Gaps

Red and blue LEDs, he explains, “aren’t typically employed clinically, though they might benefit some issues.” Red light devices, some suggest, enhance blood flow, oxygen uptake and cell renewal in the skin, and stimulate collagen production – an important goal for anti-aging. “Research exists,” comments the expert. “But it’s not conclusive.” Nevertheless, given the plethora of available tools, “we’re uncertain whether commercial devices replicate research conditions. Optimal treatment times are unknown, proper positioning requirements, whether or not that will increase the risk versus the benefit. Numerous concerns persist.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, bacteria linked to pimples. Research support isn’t sufficient for standard medical recommendation – 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 observes, though when purchasing home devices, “we recommend careful testing and security confirmation. If it’s not medically certified, the regulation is a bit grey.”

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 states. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that it’s too good to be true. However, scientific investigation has altered his perspective.

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 designed tools for biological testing,” he recalls. “I remained doubtful. It was an unusual wavelength of about 1070 nanometres, that many assumed was biologically inert.”

Its beneficial characteristic, nevertheless, was its efficient water penetration, enabling deeper tissue penetration.

Mitochondrial Impact and Cognitive Support

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. Mitochondria are the powerhouses of cells, generating energy for them to function. “Mitochondria exist throughout the body, particularly in neural cells,” notes the researcher, 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 limited quantities these molecules, notes the scientist, “stimulates so-called chaperone proteins which look after your mitochondria, protect cellular integrity and manage defective proteins.”

All of these mechanisms appear promising for treating a brain disease: free radical neutralization, swelling control, and pro-autophagy – autophagy being the process the cell uses to clear unwanted damaging proteins.

Ongoing Study Progress and Specialist Evaluations

When recently reviewing 1070nm research for cognitive decline, he reports, about 400 people were taking part in four studies, comprising his early research projects