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Light-based treatment is clearly enjoying a surge in popularity. There are now available glowing gadgets targeting issues like skin conditions and wrinkles along with sore muscles and oral inflammation, recently introduced is a toothbrush equipped with miniature red light sources, promoted by the creators as “a breakthrough in at-home oral care.” Internationally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. There are even infrared saunas available, 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, stimulating skin elasticity, relaxing muscles, relieving inflammation and persistent medical issues while protecting against dementia.

Understanding the Evidence

“It sounds a bit like witchcraft,” says a neuroscience expert, professor in neuroscience at Durham University and a convert to the value of light therapy. Naturally, certain impacts of light on human physiology are proven. Sunlight enables vitamin D production, 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 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.

Types of Light Therapy

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, most other light therapy devices deploy red or infrared light. In rigorous scientific studies, such as Chazot’s investigations into the effects of infrared on brain cells, determining the precise frequency is essential. Light is a form of electromagnetic radiation, 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, including invisible ultraviolet radiation, then visible light (all the colours we see in a rainbow) and then infrared (which we can see with night-vision goggles).

UV light has been used by medical dermatologists for many years to manage persistent skin disorders including eczema and psoriasis. It works on the immune system within cells, “and suppresses swelling,” explains a skin specialist. “Considerable data validates phototherapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (usually producing colored light emissions) “tend to be a bit more superficial.”

Safety Considerations and Medical Oversight

Potential UVB consequences, such as burning or tanning, are well known but in medical devices the light is delivered in a “narrow-band” form – indicating limited wavelength spectrum – which decreases danger. “Treatment is monitored by medical staff, meaning intensity is regulated,” explains the dermatologist. And crucially, the lightbulbs are calibrated by medical technicians, “to guarantee appropriate wavelength emission – different from beauty salons, where it’s a bit unregulated, and we don’t really know what wavelengths are being used.”

Consumer Devices and Evidence Gaps

Red and blue light sources, he explains, “aren’t really used in the medical sense, but they may help with certain conditions.” Red LEDs, it is proposed, help boost blood circulation, oxygen uptake and cell renewal in the skin, and activate collagen formation – a primary objective in youth preservation. “The evidence is there,” says Ho. “However, it’s limited.” Regardless, given the plethora of available tools, “we’re uncertain whether commercial devices replicate research conditions. Appropriate exposure periods aren’t established, ideal distance from skin surface, if benefits outweigh potential risks. Many uncertainties remain.”

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 – although, notes the dermatologist, “it’s commonly used in cosmetic clinics.” Individuals include it in their skincare practices, he mentions, though when purchasing home devices, “we recommend careful testing and security confirmation. Unless it’s a medical device, the regulation is a bit grey.”

Cutting-Edge Studies and Biological Processes

Simultaneously, in a far-flung field of pioneering medical science, researchers have been testing neural cells, discovering multiple mechanisms for infrared’s cellular benefits. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he reports. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that claims seem exaggerated. But his research has thoroughly changed his mind in that respect.

The scientist mainly develops medications for neurological conditions, 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 was pretty sceptical. The specific wavelength measured approximately 1070nm, that many assumed was biologically inert.”

Its beneficial characteristic, however, was its ability to transmit through aqueous environments, allowing substantial bodily penetration.

Mitochondrial Impact and Cognitive Support

Additional research indicated infrared affected cellular mitochondria. Mitochondria produce ATP for cell function, generating energy for them to function. “Every cell in your body has mitochondria, even within brain tissue,” notes the researcher, who, as a neuroscientist, decided to focus the research on brain cells. “Studies demonstrate enhanced cerebral circulation with light treatment, which is always very good.”

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, “stimulates so-called chaperone proteins which look after your mitochondria, preserve cell function and eliminate damaged proteins.”

Such mechanisms indicate hope for cognitive disorders: antioxidant, inflammation reduction, and cellular cleanup – 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 says, several hundred individuals participated in various investigations, comprising his early research projects