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Light therapy is definitely experiencing a moment. There are now available glowing gadgets for everything from skin conditions and wrinkles along with sore muscles and oral inflammation, recently introduced is a toothbrush outfitted with small red light diodes, promoted by the creators as “a breakthrough for domestic dental hygiene.” Worldwide, the sector valued at $1bn last year is expected to increase to $1.8bn within the next decade. There are even infrared saunas available, where instead of hot coals (real or electric) heating the air, the infrared radiation heats your body itself. As claimed by enthusiasts, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, reducing swelling and persistent medical issues and potentially guarding against cognitive decline.

Research and Reservations

“It sounds a bit like witchcraft,” says a Durham University professor, a scientist who has studied phototherapy extensively. Naturally, some of light’s effects on our bodies are well established. Sunlight helps us make vitamin D, needed for bone health, immunity, muscles and more. Light exposure controls our sleep-wake cycles, as well, triggering the release of neurochemicals and hormones while we are awake, 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. Undoubtedly, light plays a vital role in human health.

Types of Light Therapy

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, including research on infrared’s impact on neural cells, determining the precise frequency is essential. Photons represent electromagnetic waves, spanning from low-energy radio waves to short-wavelength gamma rays. Phototherapy, or light therapy utilizes intermediate light frequencies, including invisible ultraviolet radiation, then visible light (all the colours we see in a rainbow) and finally infrared detectable with special equipment.

UV light has been used by medical dermatologists for many years to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It works on the immune system within cells, “and suppresses swelling,” notes a dermatology expert. “Considerable data validates phototherapy.” UVA penetrates skin more deeply than UVB, while the LEDs in consumer devices (usually producing colored light emissions) “typically have shallower penetration.”

Risk Assessment and Professional Supervision

Potential UVB consequences, including sunburn or skin darkening, are well known but in medical devices the light is delivered in a “narrow-band” form – meaning smaller wavelengths – which minimises the risks. “Treatment is monitored by medical staff, thus exposure is controlled,” notes the specialist. And crucially, the light sources are adjusted by technical experts, “to ensure that the wavelength that’s being delivered is fit for purpose – as opposed to commercial tanning facilities, where oversight might be limited, and wavelength accuracy isn’t verified.”

Consumer Devices and Evidence Gaps

Red and blue LEDs, he explains, “aren’t really used in the medical sense, though they might benefit some issues.” Red LEDs, it is proposed, improve circulatory function, oxygen utilization and skin cell regeneration, and promote collagen synthesis – a primary objective in youth preservation. “The evidence is there,” comments the expert. “Although it’s not strong.” Regardless, with numerous products on the market, “we’re uncertain whether commercial devices replicate research conditions. We don’t know the duration, ideal distance from skin surface, if benefits outweigh potential risks. There are lots of questions.”

Specific Applications and Professional Perspectives

Early blue-light applications focused on skin microbes, microorganisms connected to breakouts. Research support isn’t sufficient for standard medical recommendation – even though, notes the dermatologist, “it’s commonly used in cosmetic clinics.” Certain patients incorporate it into their regimen, he mentions, though when purchasing home devices, “we advise cautious experimentation and safety verification. Without proper medical classification, standards are somewhat unclear.”

Advanced Research and Cellular Mechanisms

At the same time, in a far-flung field of pioneering medical science, researchers have been testing neural cells, discovering multiple mechanisms for infrared’s cellular benefits. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he says. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that results appear unrealistic. Yet, experimental evidence has transformed his viewpoint.

The scientist mainly develops medications for neurological conditions, 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 says. “I remained doubtful. The specific wavelength measured approximately 1070nm, that many assumed was biologically inert.”

The advantage it possessed, however, was that it travelled through water easily, enabling deeper tissue penetration.

Cellular Energy and Neurological Benefits

Additional research indicated infrared affected cellular mitochondria. Mitochondria are the powerhouses of cells, creating power for cellular operations. “Every cell in your body has mitochondria, even within brain tissue,” explains the neuroscientist, 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 consistently beneficial.”

With specific frequency application, cellular power plants create limited oxidative molecules. In low doses this substance, says Chazot, “activates protective proteins that safeguard mitochondria, protect cellular integrity and manage defective proteins.”

All of these mechanisms appear promising for treating a brain disease: free radical neutralization, anti-inflammatory, and waste removal – autophagy being the process the cell uses to clear unwanted damaging proteins.

Current Research Status and Professional Opinions

Upon examining current studies on light therapy for dementia, he says, approximately 400 participants enrolled in multiple trials, incorporating his preliminary American studies