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Light therapy is certainly having a wave of attention. Consumers can purchase light-emitting tools for everything from complexion problems and aging signs along with sore muscles and gum disease, the newest innovation is a dental hygiene device equipped with small red light diodes, promoted by the creators as “a major advance 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, that employ light waves rather than traditional heat sources, your body is warmed directly by infrared light. 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.

Research and Reservations

“It sounds a bit like witchcraft,” observes a neuroscience expert, professor in neuroscience at Durham University and a convert to the value of light therapy. Naturally, we know light influences biological functions. Our bodies produce vitamin D through sun exposure, needed for bone health, immunity, muscles and more. Natural light synchronizes our biological clocks, as well, stimulating neurotransmitter and hormone production during daytime, and winding down bodily functions for sleep as it fades into night. Artificial sun lamps are a common remedy for people with seasonal affective disorder (Sad) to combat seasonal emotional slumps. Undoubtedly, light plays a vital role in human health.

Different Light Modalities

Although mood lamps generally utilize blue-spectrum frequencies, most other light therapy devices deploy red or infrared light. In rigorous scientific studies, including research on infrared’s impact on neural cells, identifying the optimal wavelength is crucial. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to the highest-energy (gamma waves). Light-based treatment uses wavelengths around the middle of this spectrum, the highest energy of those being invisible ultraviolet, then visible light (all the colours we see in a rainbow) and infrared light visible through night vision technology.

Dermatologists have utilized UV therapy for extensive periods to manage persistent skin disorders including eczema and psoriasis. It affects cellular immune responses, “and suppresses swelling,” says a skin specialist. “There’s lots of evidence for phototherapy.” UVA goes deeper into the skin than UVB, whereas the LEDs we see on consumer light-therapy devices (usually producing colored light emissions) “tend to be a bit more superficial.”

Safety Protocols and Medical Guidance

The side-effects of UVB exposure, such as burning or tanning, are understood but clinical devices employ restricted wavelength ranges – indicating limited wavelength spectrum – which decreases danger. “It’s supervised by a healthcare professional, thus exposure is controlled,” explains the dermatologist. Most importantly, the devices are tuned by qualified personnel, “to ensure that the wavelength that’s being delivered is fit for purpose – different from beauty salons, where it’s a bit unregulated, and wavelength accuracy isn’t verified.”

Home Devices and Scientific Uncertainty

Red and blue LEDs, he explains, “aren’t typically employed clinically, though they might benefit some issues.” Red LEDs, it is proposed, improve circulatory function, oxygen absorption and skin cell regeneration, and stimulate collagen production – an important goal for anti-aging. “The evidence is there,” comments the expert. “Although it’s not strong.” In any case, 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. We don’t know the duration, ideal distance from skin surface, if benefits outweigh potential risks. Numerous concerns persist.”

Treatment Areas and Specialist Views

Initial blue-light devices addressed acne bacteria, a microbe associated with acne. Scientific backing remains inadequate for regular prescription – even though, explains the specialist, “it’s commonly used in cosmetic clinics.” Individuals include it in their skincare practices, he observes, 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

Meanwhile, in innovative scientific domains, researchers have been testing neural cells, discovering multiple mechanisms for infrared’s cellular benefits. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he reports. Multiple claimed advantages have created skepticism toward light treatment – that claims seem exaggerated. But his research has thoroughly changed his mind in that respect.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, 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 explains. “I was quite suspicious. It was an unusual wavelength of about 1070 nanometres, that nobody believed did anything biological.”

What it did have going for it, though, was its efficient water penetration, allowing substantial bodily penetration.

Cellular Energy and Neurological Benefits

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. These organelles generate cellular energy, creating power for cellular operations. “All human cells contain mitochondria, even within brain tissue,” explains the neuroscientist, who, as a neuroscientist, decided to focus the research on brain cells. “Studies demonstrate enhanced cerebral circulation with light treatment, which is generally advantageous.”

With specific frequency application, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In low doses this substance, says Chazot, “stimulates so-called chaperone proteins which look after your mitochondria, look after your cells and also deal with the unwanted proteins.”

All of these mechanisms appear promising for treating a brain disease: oxidative protection, anti-inflammatory, and cellular cleanup – autophagy being the process the cell uses to clear unwanted damaging proteins.

Ongoing Study Progress and Specialist Evaluations

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, incorporating his preliminary American studies