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Light-based treatment is certainly having a surge in popularity. There are now available glowing gadgets for everything from skin conditions and wrinkles as well as sore muscles and oral inflammation, recently introduced is an oral care tool equipped with tiny red LEDs, described by its makers as “a significant discovery in at-home oral care.” Worldwide, 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, your body is warmed directly by infrared light. As claimed by enthusiasts, it feels similar to a full-body light therapy session, boosting skin collagen, easing muscle tension, relieving inflammation and long-term ailments while protecting against dementia.

The Science and Skepticism

“It appears somewhat mystical,” observes a Durham University professor, who has researched light therapy for two decades. Of course, we know light influences biological functions. Our bodies produce vitamin D through sun exposure, crucial for strong bones, immune defense, and tissue repair. Sunlight regulates our circadian rhythms, as well, triggering the release of neurochemicals and hormones while we are awake, and signaling the body to slow down for nighttime. Daylight-simulating devices frequently help individuals with seasonal depression to elevate spirits during colder months. Undoubtedly, light plays a vital role in human health.

Types of Light Therapy

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, like examinations of infrared influence on cerebral tissue, identifying the optimal wavelength is crucial. Light is a form of electromagnetic radiation, spanning from low-energy radio waves to high-energy gamma radiation. Light-based treatment employs mid-spectrum wavelengths, 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).

Dermatologists have utilized UV therapy for extensive periods to manage persistent skin disorders including eczema and psoriasis. It affects cellular immune responses, “and dampens down inflammation,” says a skin specialist. “Considerable data validates phototherapy.” UVA reaches deeper skin layers compared to UVB, whereas the LEDs we see on consumer light-therapy devices (typically emitting red, infrared or blue wavelengths) “tend to be a bit more superficial.”

Risk Assessment and Professional Supervision

Potential UVB consequences, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – that reduces potential hazards. “Treatment is monitored by medical staff, thus exposure is controlled,” says Ho. Essentially, the devices are tuned by qualified personnel, “to ensure that the wavelength that’s being delivered is fit for purpose – 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 explains, “aren’t typically employed clinically, though they might benefit some issues.” Red LEDs, it is proposed, enhance blood flow, oxygen utilization and skin cell regeneration, and stimulate collagen production – an important goal for anti-aging. “The evidence is there,” states the dermatologist. “But it’s not conclusive.” Regardless, with numerous products on the market, “we’re uncertain whether commercial devices replicate research conditions. We don’t know the duration, ideal distance from skin surface, if benefits outweigh potential risks. There are lots of questions.”

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 – even though, says Ho, “it’s frequently employed in beauty centers.” Some of his patients use it as part of their routine, he says, though when purchasing home devices, “we advise cautious experimentation and safety verification. Unless it’s a medical device, oversight remains ambiguous.”

Cutting-Edge Studies and Biological Processes

Simultaneously, in advanced research areas, scientists have been studying cerebral tissue, identifying a number of ways in which infrared can boost cellular health. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he says. The numerous reported benefits have generated doubt regarding phototherapy – that claims seem exaggerated. 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 recalls. “I remained doubtful. It was an unusual wavelength of about 1070 nanometres, which most thought had no biological effect.”

Its beneficial characteristic, nevertheless, was its ability to transmit through aqueous environments, 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, 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. “Research confirms improved brain blood flow with phototherapy, which is generally advantageous.”

Using 1070nm wavelength, cellular power plants create limited oxidative molecules. At controlled levels these compounds, says Chazot, “triggers guardian proteins that maintain organelle health, protect cellular integrity and manage defective proteins.”

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

Ongoing Study Progress and Specialist Evaluations

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