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Light-based treatment is clearly enjoying a surge in popularity. Consumers can purchase light-emitting tools designed to address skin conditions and wrinkles to sore muscles and gum disease, recently introduced is an oral care tool outfitted with small red light diodes, marketed by the company as “a major advance in personal mouth health.” Globally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. There are even infrared saunas available, that employ light waves rather than traditional heat sources, the thermal energy targets your tissues immediately. Based on supporter testimonials, it feels similar to a full-body light therapy session, enhancing collagen production, soothing sore muscles, alleviating inflammatory responses and persistent medical issues while protecting against dementia.

The Science and Skepticism

“It feels almost magical,” observes Paul Chazot, who has researched light therapy for two decades. Of course, certain impacts of light on human physiology are proven. Our bodies produce vitamin D through sun exposure, needed for bone health, immunity, muscles and more. Sunlight regulates our circadian rhythms, additionally, activating brain chemicals and hormonal responses in daylight, and preparing the body for rest as darkness falls. Daylight-simulating devices are a common remedy for people with seasonal affective disorder (Sad) to boost low mood in winter. Undoubtedly, light plays a vital role in human health.

Different Light Modalities

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, the majority of phototherapy tools use red or near-infrared wavelengths. 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 high-energy gamma radiation. Phototherapy, or light therapy employs mid-spectrum wavelengths, 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.

UV light has been used by medical dermatologists for many years for addressing long-term dermatological issues like vitiligo. It works on the immune system within cells, “and suppresses swelling,” says a dermatology expert. “Substantial research supports light therapy.” UVA goes deeper into the skin than UVB, while the LEDs in consumer devices (usually producing colored light emissions) “typically have shallower penetration.”

Safety Protocols and Medical Guidance

The side-effects of UVB exposure, including sunburn or skin darkening, are well known but in medical devices the light is delivered in a “narrow-band” form – 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 – unlike in tanning salons, where regulations may be lax, and emission spectra aren’t confirmed.”

Home Devices and Scientific Uncertainty

Colored light diodes, he notes, “aren’t typically employed clinically, but they may help with certain conditions.” Red LEDs, it is proposed, enhance blood flow, oxygen absorption and skin cell regeneration, and promote collagen synthesis – a key aspiration in anti-ageing effects. “Studies are available,” says Ho. “But it’s not conclusive.” Nevertheless, 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. Appropriate exposure periods aren’t established, ideal distance from skin surface, if benefits outweigh potential risks. There are lots of questions.”

Treatment Areas and Specialist Views

One of the earliest blue-light products targeted Cutibacterium acnes, a microbe associated with acne. Scientific backing remains inadequate for regular prescription – 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. If it’s not medically certified, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

Simultaneously, in advanced research areas, researchers have been testing neural cells, identifying a number of ways in which infrared can boost cellular health. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he says. Multiple claimed advantages have created skepticism toward light treatment – that it’s too good to be true. But his research has thoroughly changed his mind in that respect.

The scientist mainly develops medications for neurological conditions, though twenty years earlier, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He developed equipment for cellular and insect experiments,” he recalls. “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, however, was that it travelled through water easily, meaning it could penetrate the body more deeply.

Cellular Energy and Neurological Benefits

Growing data suggested infrared influenced energy-producing organelles. Mitochondria are the powerhouses of cells, producing fuel for biological processes. “Every cell in your body has mitochondria, particularly in neural cells,” 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 consistently beneficial.”

With 1070 treatment, cellular power plants create limited oxidative molecules. In low doses this substance, says Chazot, “triggers guardian proteins that maintain organelle health, preserve cell function and eliminate damaged proteins.”

All of these mechanisms appear promising for treating a brain disease: oxidative protection, inflammation reduction, and pro-autophagy – autophagy representing cellular waste disposal.

Current Research Status and Professional Opinions

Upon examining current studies on light therapy for dementia, he says, approximately 400 participants enrolled in multiple trials, including his own initial clinical trials in the US