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Phototherapy is clearly enjoying a surge in popularity. You can now buy glowing gadgets designed to address dermatological concerns and fine lines to aching tissues and gum disease, the newest innovation is a dental hygiene device enhanced with small red light diodes, marketed by the company as “a significant discovery in personal mouth health.” Internationally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion 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, the experience resembles using an LED facial mask, enhancing collagen production, relaxing muscles, reducing swelling and long-term ailments and potentially guarding against cognitive decline.

The Science and Skepticism

“It appears somewhat mystical,” notes a neuroscience expert, professor in neuroscience at Durham University and a convert to the value of light therapy. Certainly, certain impacts of light on human physiology are proven. Our bodies produce vitamin D through sun exposure, needed for bone health, immunity, muscles and more. Sunlight regulates our circadian rhythms, as well, activating brain chemicals and hormonal responses in daylight, and signaling the body to slow down for nighttime. Daylight-simulating devices are a common remedy for people with seasonal affective disorder (Sad) to elevate spirits during colder months. Undoubtedly, light plays a vital role in human health.

Different Light Modalities

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, finding the right frequency is key. Light constitutes electromagnetic energy, extending from long-wavelength radiation to the highest-energy (gamma waves). Light-based treatment employs mid-spectrum wavelengths, including invisible ultraviolet radiation, followed by visible light encompassing rainbow colors and finally infrared detectable with special equipment.

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,” explains a skin specialist. “There’s lots of evidence for phototherapy.” UVA reaches deeper skin layers compared to UVB, whereas the LEDs we see on consumer light-therapy devices (which generally deliver red, infrared or blue light) “typically have shallower penetration.”

Safety Protocols and Medical Guidance

UVB radiation effects, including sunburn or skin darkening, are understood but clinical devices employ restricted wavelength ranges – indicating limited wavelength spectrum – that reduces potential hazards. “Treatment is monitored by medical staff, so the dosage is monitored,” says Ho. Most importantly, the lightbulbs are calibrated by medical technicians, “to ensure that the wavelength that’s being delivered is fit for purpose – as opposed to commercial tanning facilities, where regulations may be lax, and wavelength accuracy isn’t verified.”

Home Devices and Scientific Uncertainty

Colored light diodes, he says, “aren’t really used in the medical sense, but they may help with certain conditions.” Red wavelength therapy, proponents claim, improve circulatory function, oxygen absorption and dermal rejuvenation, and promote collagen synthesis – a key aspiration in anti-ageing effects. “Studies are available,” says Ho. “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.”

Specific Applications and Professional Perspectives

One of the earliest blue-light products targeted Cutibacterium acnes, a microbe associated with acne. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – even though, explains the specialist, “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.”

Innovative Investigations and Molecular Effects

Meanwhile, in innovative scientific domains, scientists have been studying cerebral tissue, discovering multiple mechanisms for infrared’s cellular benefits. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he says. The numerous reported benefits have generated doubt regarding phototherapy – that it’s too good to be true. But his research has thoroughly changed his mind in that respect.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, however two decades past, a physician creating light-based cold sore therapy requested his biological knowledge. “He created some devices so that we could work with them with cells and with fruit flies,” he recalls. “I remained doubtful. It was an unusual wavelength of about 1070 nanometres, that many assumed was biologically inert.”

Its beneficial characteristic, however, was its efficient water penetration, allowing substantial bodily penetration.

Mitochondrial Effects and Brain Health

Growing data suggested infrared influenced energy-producing organelles. Mitochondria produce ATP for cell function, creating power for cellular operations. “Mitochondria exist throughout the body, including the brain,” explains the neuroscientist, who, as a neuroscientist, decided to focus the research on brain cells. “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, notes the scientist, “activates protective proteins that safeguard mitochondria, preserve cell function and eliminate damaged proteins.”

These processes show potential for neurological conditions: oxidative protection, inflammation reduction, and cellular cleanup – self-digestion mechanisms eliminating harmful elements.

Present Investigation Status and Expert Assessments

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he says, several hundred individuals participated in various investigations, including his own initial clinical trials in the US