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Light-based treatment is certainly having a surge in popularity. There are now available illuminated devices designed to address dermatological concerns and fine lines to muscle pain and oral inflammation, the latest being an oral care tool equipped with small red light diodes, marketed by the company as “a breakthrough in personal mouth health.” Globally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. There are even infrared saunas available, which use infrared light to warm the body directly, your body is warmed directly by infrared light. According to its devotees, the experience resembles using an LED facial mask, boosting skin collagen, easing muscle tension, reducing swelling and long-term ailments as well as supporting brain health.

The Science and Skepticism

“It sounds a bit like witchcraft,” notes Paul Chazot, professor in neuroscience at Durham University and a convert to the value of light therapy. Naturally, some of light’s effects on our bodies are well established. Sunlight enables vitamin D production, crucial for strong bones, immune defense, and tissue repair. Light exposure controls our sleep-wake cycles, additionally, triggering the release of neurochemicals and hormones while we are awake, and preparing the body for rest as darkness falls. Daylight-simulating devices 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, the majority of phototherapy tools use red or near-infrared wavelengths. In serious clinical research, 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 the highest-energy (gamma waves). Light-based treatment utilizes intermediate light frequencies, the highest energy of those being invisible ultraviolet, followed by visible light encompassing rainbow colors 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 works on the immune system within cells, “and reduces inflammatory processes,” notes Dr Bernard Ho. “Considerable data validates phototherapy.” UVA reaches deeper skin layers compared to UVB, in contrast to LEDs in commercial products (usually producing colored light emissions) “tend to be a bit more superficial.”

Risk Assessment and Professional Supervision

UVB radiation effects, such as burning or tanning, are understood but clinical devices employ restricted wavelength ranges – meaning smaller wavelengths – which minimises the risks. “Therapy is overseen by qualified practitioners, so the dosage is monitored,” notes the specialist. Essentially, 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 oversight might be limited, and wavelength accuracy isn’t verified.”

Commercial Products and Research Limitations

Red and blue light sources, he notes, “don’t have strong medical applications, but could assist with specific concerns.” Red wavelength therapy, proponents claim, enhance blood flow, oxygen absorption and dermal rejuvenation, and promote collagen synthesis – an important goal for anti-aging. “Research exists,” comments the expert. “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, proper positioning requirements, if benefits outweigh potential risks. Numerous concerns persist.”

Specific Applications and Professional Perspectives

Early blue-light applications focused on skin microbes, a microbe associated with acne. Scientific backing remains inadequate for regular prescription – although, notes the dermatologist, “it’s often seen in medical spas or aesthetics practices.” Some of his patients use it as part of their routine, he mentions, but if they’re buying a device for home use, “we recommend careful testing and security confirmation. Without proper medical classification, the regulation is a bit grey.”

Cutting-Edge Studies and Biological Processes

Simultaneously, in innovative scientific domains, scientists have been studying cerebral tissue, identifying a number of ways in which infrared can boost cellular health. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he states. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that results appear unrealistic. However, scientific investigation has altered his perspective.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, but over 20 years ago, a physician creating light-based cold sore therapy requested his biological knowledge. “He developed equipment for cellular and insect experiments,” he recalls. “I remained doubtful. It was an unusual wavelength of about 1070 nanometres, that many assumed was biologically inert.”

What it did have going for it, nevertheless, was its ability to transmit through aqueous environments, allowing substantial bodily penetration.

Mitochondrial Effects and Brain Health

Additional research indicated infrared affected cellular mitochondria. These organelles generate cellular energy, generating energy for them to function. “All human cells contain mitochondria, including the brain,” notes the researcher, 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.”

Using 1070nm wavelength, cellular power plants create limited oxidative molecules. At controlled levels these compounds, says Chazot, “triggers guardian proteins that maintain organelle health, preserve cell function and eliminate damaged proteins.”

These processes show potential for neurological conditions: oxidative protection, swelling control, and waste removal – self-digestion mechanisms eliminating harmful elements.

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