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Light-based treatment is certainly having a surge in popularity. There are now available light-emitting tools targeting issues like skin conditions and wrinkles to sore muscles and periodontal issues, the latest being an oral care tool equipped 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. You can even go and sit in an infrared sauna, where instead of hot coals (real or electric) heating the air, the thermal energy targets your tissues immediately. Based on supporter testimonials, it’s like bathing in one of those LED-lit beauty masks, enhancing collagen production, easing muscle tension, reducing swelling and persistent medical issues while protecting against dementia.

Research and Reservations

“It feels almost magical,” notes a neuroscience expert, professor in neuroscience at Durham University and a convert to the value of light therapy. Of course, some of light’s effects on our bodies are well established. Our bodies produce vitamin D through sun exposure, needed for bone health, immunity, muscles and more. Sunlight regulates our circadian rhythms, as well, triggering the release of neurochemicals and hormones while we are awake, 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. So there’s no doubt we need light energy to function well.

Various Phototherapy Approaches

Although mood lamps generally utilize blue-spectrum frequencies, the majority of phototherapy tools use red or near-infrared wavelengths. During advanced medical investigations, including research on infrared’s impact on neural cells, finding the right frequency is key. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to high-energy gamma radiation. Light-based treatment utilizes intermediate light frequencies, with ultraviolet representing the higher energy invisible light, then the visible spectrum we perceive as colors and finally infrared detectable with special equipment.

Ultraviolet treatment has been employed by skin specialists for decades to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It modulates intracellular immune mechanisms, “and dampens down inflammation,” says a dermatology expert. “Considerable data validates phototherapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (typically emitting red, infrared or blue wavelengths) “typically have shallower penetration.”

Risk Assessment and Professional Supervision

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 minimises the risks. “Therapy is overseen by qualified practitioners, so the dosage is monitored,” says Ho. And crucially, the devices are tuned by qualified personnel, “to confirm suitable light frequency output – different from beauty salons, where regulations may be lax, and we don’t really know what wavelengths are being used.”

Commercial Products and Research Limitations

Red and blue light sources, he says, “don’t have strong medical applications, but they may help with certain conditions.” Red wavelength therapy, proponents claim, enhance blood flow, oxygen absorption and skin cell regeneration, and promote collagen synthesis – an important goal for anti-aging. “Research exists,” states the dermatologist. “However, it’s limited.” 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. Optimal treatment times are unknown, ideal distance from skin surface, whether or not that will increase the risk versus the benefit. Many uncertainties remain.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – although, explains the specialist, “it’s commonly used in cosmetic clinics.” Some of his patients use it as part of their routine, he observes, but if they’re buying a device for home use, “we just tell them to try it carefully and to make sure it has been assessed for safety. Unless it’s a medical device, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

Simultaneously, in advanced research areas, scientists have been studying cerebral tissue, revealing various pathways for light-enhanced cell function. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he states. The numerous reported benefits have generated doubt regarding phototherapy – that claims seem exaggerated. However, scientific investigation has altered his perspective.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, but over 20 years ago, 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 was quite suspicious. This particular frequency was around 1070 nanometers, that nobody believed did anything biological.”

What it did have going for it, however, was that it travelled through water easily, enabling deeper tissue penetration.

Cellular Energy and Neurological Benefits

Growing data suggested infrared influenced energy-producing organelles. These organelles generate cellular energy, generating energy for them to function. “Every cell in your body has mitochondria, including the brain,” says Chazot, who prioritized neurological investigations. “Research confirms improved brain blood flow with phototherapy, which is generally advantageous.”

With 1070 treatment, energy organelles generate minimal reactive oxygen compounds. In low doses this substance, notes the scientist, “activates protective proteins that safeguard mitochondria, preserve cell function and eliminate damaged proteins.”

Such mechanisms indicate hope for cognitive disorders: oxidative protection, swelling control, 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 reports, several hundred individuals participated in various investigations, incorporating his preliminary American studies