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Phototherapy is clearly enjoying a moment. Consumers can purchase light-emitting tools for everything from dermatological concerns and fine lines to muscle pain and periodontal issues, the newest innovation is an oral care tool equipped with small red light diodes, promoted by the creators as “a breakthrough in personal mouth health.” Globally, 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, which use infrared light to warm the body directly, your body is warmed directly by infrared light. As claimed by enthusiasts, the experience resembles using an LED facial mask, stimulating skin elasticity, relaxing muscles, alleviating inflammatory responses and long-term ailments and potentially guarding against cognitive decline.

Understanding the Evidence

“It sounds a bit like witchcraft,” notes Paul Chazot, who has researched light therapy for two decades. Naturally, some of light’s effects on our bodies are well established. Our bodies produce vitamin D through sun exposure, essential for skeletal strength, immune function, and muscular health. 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 frequently help individuals with seasonal depression to combat seasonal emotional slumps. Clearly, light energy is essential for optimal functioning.

Different Light Modalities

Although mood lamps generally utilize blue-spectrum frequencies, most other light therapy devices deploy red or infrared light. During advanced medical investigations, such as Chazot’s investigations into the effects of infrared on brain cells, finding the right frequency is key. Photons represent electromagnetic waves, extending from long-wavelength radiation to short-wavelength gamma rays. Therapeutic light application uses wavelengths around the middle of this spectrum, 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).

Ultraviolet treatment has been employed by skin specialists for decades to manage persistent skin disorders including eczema and psoriasis. It modulates intracellular immune mechanisms, “and reduces inflammatory processes,” explains Dr Bernard Ho. “Substantial research supports light therapy.” UVA penetrates skin more deeply than UVB, in contrast to LEDs in commercial products (typically emitting red, infrared or blue wavelengths) “tend to be a bit more superficial.”

Safety Considerations and Medical Oversight

Potential UVB consequences, including sunburn or skin darkening, are recognized but medical equipment uses controlled narrow-band delivery – meaning smaller wavelengths – that reduces potential hazards. “It’s supervised by a healthcare professional, meaning intensity is regulated,” explains the dermatologist. Most importantly, the lightbulbs are calibrated by medical technicians, “to ensure that the wavelength that’s being delivered is fit for purpose – different from beauty salons, where oversight might be limited, and emission spectra aren’t confirmed.”

Commercial Products and Research Limitations

Red and blue LEDs, he explains, “aren’t typically employed clinically, though they might benefit some issues.” Red light devices, some suggest, improve circulatory function, oxygen utilization and skin cell regeneration, and stimulate collagen production – a primary objective in youth preservation. “Research exists,” comments the expert. “Although it’s not strong.” Nevertheless, with numerous products on the market, “it’s unclear if device outputs match study parameters. We don’t know the duration, how close the lights should be to the skin, whether or not that will increase the risk versus the benefit. Numerous concerns persist.”

Targeted Uses and Expert Opinions

One of the earliest blue-light products targeted Cutibacterium acnes, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – even though, explains the specialist, “it’s commonly used in cosmetic clinics.” Certain patients incorporate it into their regimen, he mentions, though when purchasing home devices, “we recommend careful testing and security confirmation. If it’s not medically certified, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

At the same time, in advanced research areas, researchers have been testing neural cells, revealing various pathways for light-enhanced cell function. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” 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. But his research has thoroughly changed his mind in that respect.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, though twenty years earlier, 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 says. “I was pretty sceptical. This particular frequency was around 1070 nanometers, that nobody believed did anything biological.”

Its beneficial characteristic, nevertheless, was its efficient water penetration, meaning it could penetrate the body more deeply.

Mitochondrial Effects and Brain Health

Additional research indicated infrared affected cellular mitochondria. Mitochondria are the powerhouses of cells, generating energy for them to function. “Mitochondria exist throughout the body, including the brain,” notes the researcher, 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 always very good.”

With 1070 treatment, cellular power plants create limited oxidative molecules. In limited quantities these molecules, explains the expert, “triggers guardian proteins that maintain organelle health, look after your cells and also deal with the unwanted proteins.”

All of these mechanisms appear promising for treating a brain disease: free radical neutralization, anti-inflammatory, and waste removal – self-digestion mechanisms eliminating harmful elements.

Ongoing Study Progress and Specialist Evaluations

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he reports, about 400 people were taking part in four studies, comprising his early research projects