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Phototherapy is definitely experiencing a moment. There are now available light-emitting tools for everything from complexion problems and aging signs along with aching tissues and gum disease, the newest innovation is a dental hygiene device enhanced with small red light diodes, promoted by the creators as “a significant discovery for domestic dental hygiene.” Worldwide, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. There are even infrared saunas available, where instead of hot coals (real or electric) heating the air, the infrared radiation heats your body itself. Based on supporter testimonials, it feels similar to a full-body light therapy session, enhancing collagen production, easing muscle tension, reducing swelling and persistent medical issues as well as supporting brain health.

The Science and Skepticism

“It feels almost magical,” notes a Durham University professor, a scientist who has studied phototherapy extensively. Of course, we know light influences biological functions. Our bodies produce vitamin D through sun exposure, needed for bone health, immunity, muscles and more. Natural light synchronizes our biological clocks, additionally, activating brain chemicals and hormonal responses in daylight, and signaling the body to slow down for nighttime. Artificial sun lamps are standard treatment for winter mood disorders to combat seasonal emotional slumps. So there’s no doubt we need light energy to function well.

Types of Light Therapy

Whereas seasonal affective disorder devices typically employ blue-range light, most other light therapy devices deploy red or infrared light. During advanced medical investigations, including research on infrared’s impact on neural cells, determining the precise frequency is essential. Light constitutes electromagnetic energy, spanning from low-energy radio waves to the highest-energy (gamma waves). Light-based treatment employs mid-spectrum wavelengths, the highest energy of those being invisible ultraviolet, then visible light (all the colours we see in a rainbow) and infrared light visible through night vision technology.

Ultraviolet treatment has been employed by skin specialists for decades for addressing long-term dermatological issues like vitiligo. It affects cellular immune responses, “and reduces inflammatory processes,” explains a dermatology expert. “There’s lots of evidence for phototherapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (which generally deliver red, infrared or blue light) “generally affect surface layers.”

Safety Protocols and Medical Guidance

UVB radiation effects, like erythema or pigmentation, are recognized but medical equipment uses controlled narrow-band delivery – indicating limited wavelength spectrum – which decreases danger. “Therapy is overseen by qualified practitioners, 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 – different from beauty salons, where it’s a bit unregulated, and emission spectra aren’t confirmed.”

Home Devices and Scientific Uncertainty

Red and blue light sources, he explains, “aren’t really used in the medical sense, but they may help with certain conditions.” Red light devices, some suggest, help boost blood circulation, oxygen absorption and dermal rejuvenation, and activate collagen formation – a key aspiration in anti-ageing effects. “The evidence is there,” says Ho. “However, it’s limited.” Nevertheless, amid the sea of devices now available, “it’s unclear if device outputs match study parameters. We don’t know the duration, how close the lights should be to the skin, 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. Scientific backing remains inadequate for regular prescription – although, says Ho, “it’s often seen in medical spas or aesthetics practices.” Certain patients incorporate it into their regimen, he mentions, but if they’re buying a device for home use, “we advise cautious experimentation and safety verification. Without proper medical classification, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

Meanwhile, in advanced research areas, researchers have been testing neural cells, discovering multiple mechanisms for infrared’s cellular benefits. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he reports. Multiple claimed advantages have created skepticism toward light treatment – that it’s too good to be true. But his research has thoroughly changed his mind in that respect.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, though twenty years earlier, a doctor developing photonic antiviral treatment consulted his scientific background. “He designed tools for biological testing,” he says. “I remained doubtful. It was an unusual wavelength of about 1070 nanometres, that nobody believed did anything biological.”

The advantage it possessed, however, was its ability to transmit through aqueous environments, meaning it could penetrate the body more deeply.

Mitochondrial Effects and Brain Health

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, particularly in neural cells,” explains the neuroscientist, who prioritized neurological investigations. “Studies demonstrate enhanced cerebral circulation with light treatment, which is consistently beneficial.”

With specific frequency application, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In low doses this substance, says Chazot, “triggers guardian proteins that maintain organelle health, preserve cell function and eliminate damaged proteins.”

These processes show potential for neurological conditions: free radical neutralization, swelling control, and cellular cleanup – autophagy representing cellular waste disposal.

Current Research Status and Professional Opinions

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he says, about 400 people were taking part in four studies, including his own initial clinical trials in the US