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Phototherapy is clearly enjoying a wave of attention. Consumers can purchase illuminated devices targeting issues like skin conditions and wrinkles along with muscle pain and periodontal issues, the latest being a toothbrush enhanced with miniature red light sources, described by its makers as “a major advance for domestic dental hygiene.” Worldwide, the sector valued at $1bn last year is expected to increase to $1.8bn within the next decade. 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, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, relieving inflammation and long-term ailments and potentially guarding against cognitive decline.

The Science and Skepticism

“It sounds a bit like witchcraft,” notes a neuroscience expert, 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, too, stimulating neurotransmitter and hormone production during daytime, and preparing the body for rest as darkness falls. Daylight-simulating devices are standard treatment for winter mood disorders to boost low mood in winter. So there’s no doubt we need light energy to function well.

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. In rigorous scientific studies, such as Chazot’s investigations into the effects of infrared on brain cells, determining the precise frequency is essential. Light constitutes electromagnetic energy, spanning from low-energy radio waves to short-wavelength gamma rays. Phototherapy, or light therapy employs mid-spectrum wavelengths, the highest energy of those being invisible ultraviolet, 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 works on the immune system within cells, “and reduces inflammatory processes,” explains a dermatology expert. “Substantial research supports light therapy.” UVA penetrates skin more deeply than UVB, whereas the LEDs we see on consumer light-therapy devices (typically emitting red, infrared or blue wavelengths) “generally affect surface layers.”

Risk Assessment and Professional Supervision

Potential UVB consequences, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – meaning smaller wavelengths – which minimises the risks. “Treatment is monitored by medical staff, thus exposure is controlled,” says Ho. Most importantly, the lightbulbs are calibrated by medical technicians, “to guarantee appropriate wavelength emission – unlike in tanning salons, where it’s a bit unregulated, and emission spectra aren’t confirmed.”

Home Devices and Scientific Uncertainty

Colored light diodes, he says, “don’t have strong medical applications, but they may help with certain conditions.” Red light devices, some suggest, enhance blood flow, oxygen utilization and dermal rejuvenation, and stimulate collagen production – a key aspiration in anti-ageing effects. “Studies are available,” says Ho. “Although it’s not strong.” In any case, amid the sea of devices now available, “it’s unclear if device outputs match study parameters. We don’t know the duration, proper positioning requirements, whether or not that will increase the risk versus the benefit. Numerous concerns persist.”

Treatment Areas and Specialist Views

Early blue-light applications focused on skin microbes, a microbe associated with acne. Research support isn’t sufficient for standard medical recommendation – although, says Ho, “it’s commonly used in cosmetic clinics.” Individuals include it in their skincare practices, he observes, however for consumer products, “we advise cautious experimentation and safety verification. If it’s not medically certified, standards are somewhat unclear.”

Cutting-Edge Studies and Biological Processes

At the same time, in innovative scientific domains, researchers have been testing neural cells, discovering multiple mechanisms for infrared’s cellular benefits. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he reports. Multiple claimed advantages have created skepticism toward light treatment – that results appear unrealistic. However, scientific investigation has altered his perspective.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, however two decades past, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He designed tools for biological testing,” he recalls. “I was quite suspicious. The specific wavelength measured approximately 1070nm, that nobody believed did anything biological.”

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

Mitochondrial Effects and Brain Health

Growing data suggested infrared influenced energy-producing organelles. These organelles generate cellular energy, generating energy for them to function. “Every cell in your body has mitochondria, including the brain,” explains the neuroscientist, who, as a neuroscientist, decided to focus the research on brain cells. “It has been shown that in humans this light therapy increases blood flow into the brain, which is consistently beneficial.”

With 1070 treatment, mitochondria also produce a small amount of a molecule known as reactive oxygen species. At controlled levels these compounds, notes the scientist, “triggers guardian proteins that maintain organelle health, preserve cell function and eliminate damaged proteins.”

These processes show potential for neurological conditions: oxidative protection, anti-inflammatory, and waste removal – autophagy representing cellular waste disposal.

Present Investigation Status and Expert Assessments

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he says, approximately 400 participants enrolled in multiple trials, comprising his early research projects