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Phototherapy is clearly enjoying a surge in popularity. You can now buy illuminated devices targeting issues like dermatological concerns and fine lines along with sore muscles and oral inflammation, the latest being a dental hygiene device equipped with tiny red LEDs, marketed by the company as “a major advance in at-home oral care.” Internationally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. There are even infrared saunas available, that employ light waves rather than traditional heat sources, your body is warmed directly by infrared light. According to its devotees, it feels similar to a full-body light therapy session, enhancing collagen production, relaxing muscles, alleviating inflammatory responses and chronic health conditions and potentially guarding against cognitive decline.

Research and Reservations

“It sounds a bit like witchcraft,” says a neuroscience expert, a scientist who has studied phototherapy extensively. Certainly, certain impacts of light on human physiology are proven. Sunlight helps us make vitamin D, essential for skeletal strength, immune function, and muscular health. Sunlight regulates our circadian rhythms, additionally, activating brain chemicals and hormonal responses in daylight, and preparing the body for rest as darkness falls. Sunlight-imitating lamps are standard treatment for winter mood disorders to elevate spirits during colder months. Undoubtedly, light plays a vital role in human health.

Types of Light Therapy

Whereas seasonal affective disorder devices typically employ blue-range light, the majority of phototherapy tools use red or near-infrared wavelengths. In serious clinical research, like examinations of infrared influence on cerebral tissue, finding the right frequency is key. Photons represent electromagnetic waves, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to the highest-energy (gamma waves). Therapeutic light application employs mid-spectrum wavelengths, with ultraviolet representing the higher energy invisible light, then visible light (all the colours we see in a rainbow) 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 affects cellular immune responses, “and suppresses swelling,” notes a dermatology expert. “There’s lots of evidence for phototherapy.” UVA penetrates skin more deeply than UVB, while the LEDs in consumer devices (which generally deliver red, infrared or blue light) “tend to be a bit more superficial.”

Safety Protocols and Medical Guidance

The side-effects of UVB exposure, such as burning or tanning, are understood but clinical devices employ restricted wavelength ranges – signifying focused frequency bands – that reduces potential hazards. “Treatment is monitored by medical staff, so the dosage is monitored,” explains the dermatologist. Essentially, the light sources are adjusted by technical experts, “to guarantee appropriate wavelength emission – different from beauty salons, where regulations may be lax, and we don’t really know what wavelengths are being used.”

Consumer Devices and Evidence Gaps

Colored light diodes, he says, “aren’t really used in the medical sense, but could assist with specific concerns.” Red light devices, some suggest, enhance blood flow, oxygen absorption and dermal rejuvenation, and stimulate collagen production – an important goal for anti-aging. “The evidence is there,” says Ho. “But it’s not conclusive.” Nevertheless, amid the sea of devices now available, “it’s unclear if device outputs match study parameters. We don’t know the duration, 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, bacteria linked to pimples. 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.” Certain patients incorporate it into their regimen, he says, though when purchasing home devices, “we just tell them to try it carefully and to make sure it has been assessed for safety. If it’s not medically certified, the regulation is a bit grey.”

Advanced Research and Cellular Mechanisms

Meanwhile, in innovative scientific domains, researchers have been testing neural cells, identifying a number of ways in which infrared can boost cellular health. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he says. The numerous reported benefits have generated doubt regarding phototherapy – that results appear unrealistic. But his research has thoroughly changed his mind in that respect.

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 explains. “I was pretty sceptical. This particular frequency was around 1070 nanometers, that many assumed was biologically inert.”

What it did have going for it, though, was that it travelled through water easily, meaning it could penetrate the body more deeply.

Mitochondrial Effects and Brain Health

Growing data suggested infrared influenced energy-producing organelles. Mitochondria are the powerhouses of cells, producing fuel for biological processes. “All human cells contain mitochondria, including the brain,” notes the researcher, 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, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In limited quantities these molecules, says Chazot, “activates protective proteins that safeguard mitochondria, protect cellular integrity and manage defective proteins.”

These processes show potential for neurological conditions: antioxidant, inflammation reduction, and pro-autophagy – autophagy being the process the cell uses to clear unwanted damaging proteins.

Current Research Status and Professional Opinions

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he reports, approximately 400 participants enrolled in multiple trials, incorporating his preliminary American studies