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Light therapy is definitely experiencing a wave of attention. Consumers can purchase illuminated devices for everything from complexion problems and aging signs along with muscle pain and gum disease, the latest being a dental hygiene device equipped with tiny red LEDs, described by its makers as “a major advance for domestic dental hygiene.” Internationally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. Options include full-body infrared sauna sessions, that employ light waves rather than traditional heat sources, the infrared radiation heats your body itself. As claimed by enthusiasts, it feels similar to a full-body light therapy session, enhancing collagen production, relaxing muscles, alleviating inflammatory responses and long-term ailments as well as supporting brain health.

Research and Reservations

“It appears somewhat mystical,” says a Durham University professor, a scientist who has studied phototherapy extensively. Certainly, we know light influences biological functions. Sunlight helps us make vitamin D, needed for bone health, immunity, muscles and more. Sunlight regulates our circadian rhythms, too, stimulating neurotransmitter and hormone production during daytime, and preparing the body for rest as darkness falls. Artificial sun lamps are standard treatment for winter mood disorders to boost low mood in winter. So there’s no doubt we need light energy to function well.

Types of Light Therapy

Although mood lamps generally utilize blue-spectrum frequencies, consumer light therapy products mostly feature red and infrared emissions. During advanced medical investigations, like examinations of infrared influence on cerebral tissue, determining the precise frequency is essential. Photons represent electromagnetic waves, extending from long-wavelength radiation to short-wavelength gamma rays. Therapeutic light application employs mid-spectrum wavelengths, with ultraviolet representing the higher energy invisible light, 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 modulates intracellular immune mechanisms, “and reduces inflammatory processes,” explains Dr Bernard Ho. “Substantial research supports light therapy.” UVA goes deeper into the skin than UVB, whereas the LEDs we see on consumer light-therapy devices (which generally deliver red, infrared or blue light) “generally affect surface layers.”

Safety Protocols and Medical Guidance

The side-effects of UVB exposure, like erythema or pigmentation, are well known but in medical devices the light is delivered in a “narrow-band” form – signifying focused frequency bands – that reduces potential hazards. “Treatment is monitored by medical staff, 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 – unlike in tanning salons, where oversight might be limited, and wavelength accuracy isn’t verified.”

Home Devices and Scientific Uncertainty

Red and blue light sources, he notes, “don’t have strong medical applications, though they might benefit some issues.” Red wavelength therapy, proponents claim, improve circulatory function, oxygen uptake and dermal rejuvenation, and activate collagen formation – an important goal for anti-aging. “Research exists,” comments the expert. “Although it’s not strong.” Regardless, 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, the risk-benefit ratio. Many uncertainties remain.”

Treatment Areas and Specialist Views

Initial blue-light devices addressed acne bacteria, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – even though, explains the specialist, “it’s commonly used in cosmetic clinics.” Some of his patients use it as part of their routine, he mentions, though when purchasing home devices, “we recommend careful testing and security confirmation. If it’s not medically certified, oversight remains ambiguous.”

Innovative Investigations and Molecular Effects

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 states. Multiple claimed advantages have created skepticism toward light treatment – 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 developed equipment for cellular and insect experiments,” he explains. “I was quite suspicious. This particular frequency was around 1070 nanometers, that many assumed was biologically inert.”

The advantage it possessed, nevertheless, 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. Mitochondria are the powerhouses of cells, producing fuel for biological processes. “All human cells contain mitochondria, even within brain tissue,” says Chazot, 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 specific frequency application, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In low doses this substance, notes the scientist, “activates protective proteins that safeguard 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 representing cellular waste disposal.

Present Investigation Status and Expert Assessments

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he states, about 400 people were taking part in four studies, incorporating his preliminary American studies