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Light therapy is certainly having a wave of attention. Consumers can purchase illuminated devices for everything from skin conditions and wrinkles along with aching tissues and periodontal issues, the latest being a toothbrush enhanced with tiny red LEDs, described by its makers as “a breakthrough for domestic dental hygiene.” Internationally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. Options include full-body infrared sauna sessions, 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, relieving inflammation and chronic health conditions while protecting against dementia.

Research and Reservations

“It appears somewhat mystical,” notes Paul Chazot, professor in neuroscience at Durham University and a convert to the value of light therapy. Of course, we know light influences biological functions. Our bodies produce vitamin D through sun exposure, crucial for strong bones, immune defense, and tissue repair. Sunlight regulates our circadian rhythms, as well, activating brain chemicals and hormonal responses in daylight, and winding down bodily functions for sleep as it fades into night. Sunlight-imitating lamps frequently help individuals with seasonal depression to combat seasonal emotional slumps. So there’s no doubt we need light energy to function well.

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. In serious clinical research, including research on infrared’s impact on neural cells, identifying the optimal wavelength is crucial. Light constitutes electromagnetic energy, spanning from low-energy radio waves to high-energy gamma radiation. Phototherapy, or light therapy uses wavelengths around the middle of this spectrum, including invisible ultraviolet radiation, 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 manage persistent skin disorders including eczema and psoriasis. It modulates intracellular immune mechanisms, “and dampens down inflammation,” notes a skin specialist. “Substantial research supports light therapy.” UVA goes deeper into the skin than UVB, whereas the LEDs we see on consumer light-therapy devices (typically emitting red, infrared or blue wavelengths) “typically have shallower penetration.”

Safety Considerations and Medical Oversight

The side-effects of UVB exposure, such as burning or tanning, are well known but in medical devices the light is delivered in a “narrow-band” form – meaning smaller wavelengths – which decreases danger. “Therapy is overseen by qualified practitioners, thus exposure is controlled,” says Ho. Most importantly, the light sources are adjusted by technical experts, “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 LEDs, he notes, “aren’t typically employed clinically, but could assist with specific concerns.” Red light devices, some suggest, enhance blood flow, oxygen absorption and dermal rejuvenation, and stimulate collagen production – a primary objective in youth preservation. “Studies are available,” states the dermatologist. “But it’s not conclusive.” Regardless, with numerous products on the market, “we don’t know whether or not the lights emitted are reflective of the research that has been done. Optimal treatment times are unknown, proper positioning requirements, whether or not that will increase the risk versus the benefit. Many uncertainties remain.”

Treatment Areas and Specialist Views

Early blue-light applications focused on skin microbes, microorganisms connected to breakouts. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – despite the fact that, says Ho, “it’s often seen in medical spas or aesthetics practices.” 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, the regulation is a bit grey.”

Innovative Investigations and Molecular Effects

Meanwhile, in advanced research areas, scientists have been studying cerebral tissue, identifying a number of ways in which infrared can boost cellular health. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he states. Multiple claimed advantages have created skepticism toward light treatment – that claims seem exaggerated. Yet, experimental evidence has transformed his viewpoint.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, however two decades past, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He designed tools for biological testing,” he says. “I was pretty sceptical. It was an unusual wavelength of about 1070 nanometres, that nobody believed did anything biological.”

Its beneficial characteristic, nevertheless, was that it travelled through water easily, enabling deeper tissue penetration.

Mitochondrial Impact and Cognitive Support

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,” notes the researcher, who prioritized neurological investigations. “Research confirms improved brain blood flow with phototherapy, which is consistently beneficial.”

Using 1070nm wavelength, cellular power plants create limited oxidative molecules. In limited quantities these molecules, says Chazot, “activates protective proteins that safeguard mitochondria, preserve cell function and eliminate damaged proteins.”

Such mechanisms indicate hope for cognitive disorders: antioxidant, anti-inflammatory, and cellular cleanup – autophagy being the process the cell uses to clear unwanted damaging proteins.

Present Investigation Status and Expert Assessments

When recently reviewing 1070nm research for cognitive decline, he says, several hundred individuals participated in various investigations, comprising his early research projects