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Light therapy is clearly enjoying a moment. Consumers can purchase illuminated devices for everything from skin conditions and wrinkles to sore muscles and gum disease, the latest being a dental hygiene device equipped with miniature red light sources, promoted by the creators as “a significant discovery for domestic dental hygiene.” Globally, 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, your body is warmed directly by infrared light. Based on supporter testimonials, it’s like bathing in one of those LED-lit beauty masks, stimulating skin elasticity, relaxing muscles, reducing swelling and chronic health conditions while protecting against dementia.

Research and Reservations

“It feels almost magical,” observes a neuroscience expert, who has researched light therapy for two decades. Certainly, we know light influences biological functions. Sunlight helps us make vitamin D, needed for bone health, immunity, muscles and more. Light exposure controls our sleep-wake cycles, additionally, triggering the release of neurochemicals and hormones while we are awake, and signaling the body to slow down for nighttime. Artificial sun lamps are standard treatment for winter mood disorders to boost low mood in winter. Clearly, light energy is essential for optimal functioning.

Types of Light Therapy

Whereas seasonal affective disorder devices typically employ blue-range light, 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, finding the right frequency is key. 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). Therapeutic light application uses wavelengths around the middle of this spectrum, 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).

Ultraviolet treatment has been employed by skin specialists for decades to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It modulates intracellular immune mechanisms, “and dampens down inflammation,” says a skin specialist. “Substantial research supports light therapy.” UVA reaches deeper skin layers compared to UVB, while the LEDs in consumer devices (typically emitting red, infrared or blue wavelengths) “tend to be a bit more superficial.”

Safety Considerations and Medical Oversight

The side-effects of UVB exposure, such as burning or tanning, are understood but clinical devices employ restricted wavelength ranges – meaning smaller wavelengths – which minimises the risks. “It’s supervised by a healthcare professional, meaning intensity is regulated,” says Ho. And crucially, the devices are tuned by qualified personnel, “to confirm suitable light frequency output – unlike in tanning salons, where regulations may be lax, and wavelength accuracy isn’t verified.”

Home Devices and Scientific Uncertainty

Colored light diodes, he notes, “don’t have strong medical applications, but they may help with certain conditions.” Red LEDs, it is proposed, improve circulatory function, oxygen uptake and cell renewal in the skin, and stimulate collagen production – a key aspiration in anti-ageing effects. “The evidence is there,” says Ho. “Although it’s not strong.” In any case, given the plethora of available tools, “we’re uncertain whether commercial devices replicate research conditions. We don’t know the duration, proper positioning requirements, whether or not that will increase the risk versus the benefit. Many uncertainties remain.”

Specific Applications and Professional Perspectives

Initial blue-light devices addressed acne bacteria, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – even though, notes the dermatologist, “it’s frequently employed in beauty centers.” Certain patients incorporate it into their regimen, he mentions, though when purchasing home devices, “we recommend careful testing and security confirmation. Without proper medical classification, standards are somewhat unclear.”

Advanced Research and Cellular Mechanisms

Simultaneously, in a far-flung field of pioneering medical science, researchers have been testing neural cells, identifying a number of ways in which infrared can boost cellular health. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he reports. The numerous reported benefits have generated doubt regarding phototherapy – that results appear unrealistic. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, but over 20 years ago, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He created some devices so that we could work with them with cells and with fruit flies,” he says. “I was quite suspicious. This particular frequency was around 1070 nanometers, that many assumed was biologically inert.”

The advantage it possessed, nevertheless, was its ability to transmit through aqueous environments, meaning it could penetrate the body more deeply.

Mitochondrial Impact and Cognitive Support

Additional research indicated infrared affected cellular mitochondria. Mitochondria produce ATP for cell function, creating power for cellular operations. “Every cell in your body has mitochondria, including the brain,” explains the neuroscientist, who prioritized neurological investigations. “Research confirms improved brain blood flow with phototherapy, 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, “stimulates so-called chaperone proteins which look after your mitochondria, protect cellular integrity and manage defective proteins.”

All of these mechanisms appear promising for treating a brain disease: antioxidant, swelling control, and waste removal – autophagy representing cellular waste disposal.

Ongoing Study Progress and Specialist Evaluations

When recently reviewing 1070nm research for cognitive decline, he states, about 400 people were taking part in four studies, including his own initial clinical trials in the US