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Light therapy is clearly enjoying a surge in popularity. Consumers can purchase light-emitting tools designed to address dermatological concerns and fine lines to aching tissues and gum disease, the latest being a dental hygiene device enhanced with tiny red LEDs, described by its makers as “a significant discovery for domestic dental hygiene.” Worldwide, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion 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. According to its devotees, the experience resembles using an LED facial mask, enhancing collagen production, relaxing muscles, reducing swelling and long-term ailments and potentially guarding against cognitive decline.

The Science and Skepticism

“It appears somewhat mystical,” observes a Durham University professor, who has researched light therapy for two decades. Naturally, we know light influences biological functions. Sunlight enables vitamin D production, essential for skeletal strength, immune function, and muscular health. Natural light synchronizes our biological clocks, too, activating brain chemicals and hormonal responses in daylight, and winding down bodily functions for sleep as it fades into night. Daylight-simulating devices are standard treatment for winter mood disorders to elevate spirits during colder months. 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, consumer light therapy products mostly feature red and infrared emissions. In serious clinical research, including research on infrared’s impact on neural cells, identifying the optimal wavelength is crucial. Photons represent electromagnetic waves, spanning from low-energy radio waves to high-energy gamma radiation. Phototherapy, or light therapy employs mid-spectrum wavelengths, the highest energy of those being invisible ultraviolet, followed by visible light encompassing rainbow colors and finally infrared detectable with special equipment.

UV light has been used by medical dermatologists for many years to manage persistent skin disorders including eczema and psoriasis. It affects cellular immune responses, “and reduces inflammatory processes,” says Dr Bernard Ho. “There’s lots of evidence for phototherapy.” UVA goes deeper into the skin than UVB, while the LEDs in consumer devices (which generally deliver red, infrared or blue light) “tend to be a bit more superficial.”

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 decreases danger. “Treatment is monitored by medical staff, thus exposure is controlled,” says Ho. And crucially, the devices are tuned by qualified personnel, “to guarantee appropriate wavelength emission – as opposed to commercial tanning facilities, where regulations may be lax, and we don’t really know what wavelengths are being used.”

Home Devices and Scientific Uncertainty

Red and blue LEDs, he notes, “aren’t really used in the medical sense, but they may help with certain conditions.” Red light devices, some suggest, improve circulatory function, oxygen utilization and dermal rejuvenation, and promote collagen synthesis – a primary objective in youth preservation. “The evidence is there,” states the dermatologist. “However, it’s limited.” Nevertheless, 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, how close the lights should be to the skin, the risk-benefit ratio. Many uncertainties remain.”

Targeted Uses and Expert Opinions

One of the earliest blue-light products targeted Cutibacterium acnes, microorganisms connected to breakouts. Research support isn’t sufficient for standard medical recommendation – although, explains the specialist, “it’s often seen in medical spas or aesthetics practices.” Some of his patients use it as part of their routine, he mentions, though when purchasing home devices, “we advise cautious experimentation and safety verification. If it’s not medically certified, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

Simultaneously, 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 states. The numerous reported benefits have generated doubt regarding phototherapy – that claims seem exaggerated. Yet, experimental evidence has transformed his viewpoint.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, but over 20 years ago, 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 explains. “I was quite suspicious. This particular frequency was around 1070 nanometers, that nobody believed did anything biological.”

What it did have going for it, nevertheless, was its ability to transmit through aqueous environments, meaning it could penetrate the body more deeply.

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, particularly in neural cells,” explains the neuroscientist, who concentrated on cerebral applications. “It has been shown that in humans this light therapy increases blood flow into the brain, which is generally advantageous.”

With specific frequency application, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In limited quantities these molecules, notes the scientist, “triggers guardian proteins that maintain organelle health, protect cellular integrity and manage defective proteins.”

Such mechanisms indicate hope for cognitive disorders: oxidative protection, anti-inflammatory, and pro-autophagy – 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, including his own initial clinical trials in the US