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Phototherapy is definitely experiencing a surge in popularity. Consumers can purchase glowing gadgets designed to address dermatological concerns and fine lines as well as aching tissues and periodontal issues, the newest innovation is an oral care tool enhanced with small red light diodes, marketed by the company as “a significant discovery for domestic dental hygiene.” Worldwide, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. Options include full-body infrared sauna sessions, that employ light waves rather than traditional heat sources, your body is warmed directly by infrared light. As claimed by enthusiasts, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, alleviating inflammatory responses and chronic health conditions as well as supporting brain health.

Understanding the Evidence

“It sounds a bit like witchcraft,” observes a neuroscience expert, who has researched light therapy for two decades. Naturally, we know light influences biological functions. Our bodies produce vitamin D through sun exposure, needed for bone health, immunity, muscles and more. Light exposure controls our sleep-wake cycles, too, triggering the release of neurochemicals and hormones while we are awake, and signaling the body to slow down for nighttime. Daylight-simulating devices are standard treatment for winter mood disorders to boost low mood in winter. Undoubtedly, light plays a vital role in human health.

Types of Light Therapy

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, consumer light therapy products mostly feature red and infrared emissions. In rigorous scientific studies, such as Chazot’s investigations into the effects of infrared on brain cells, determining the precise frequency is essential. Light constitutes electromagnetic energy, extending from long-wavelength radiation to the highest-energy (gamma waves). Light-based treatment utilizes intermediate light frequencies, including invisible ultraviolet radiation, then visible light (all the colours we see in a rainbow) and infrared light visible through night vision technology.

Dermatologists have utilized UV therapy for extensive periods to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It works on the immune system within cells, “and suppresses swelling,” notes Dr Bernard Ho. “There’s lots of evidence for phototherapy.” UVA goes deeper into the skin than UVB, while the LEDs in consumer devices (which generally deliver red, infrared or blue light) “tend to be a bit more superficial.”

Safety Considerations and Medical Oversight

Potential UVB consequences, such as burning or tanning, are understood but clinical devices employ restricted wavelength ranges – indicating limited wavelength spectrum – which decreases danger. “It’s supervised by a healthcare professional, thus exposure is controlled,” says Ho. Most importantly, the lightbulbs are calibrated by medical technicians, “to confirm suitable light frequency output – unlike in tanning salons, where oversight might be limited, and emission spectra aren’t confirmed.”

Home Devices and Scientific Uncertainty

Red and blue LEDs, he explains, “aren’t typically employed clinically, but they may help with certain conditions.” Red wavelength therapy, proponents claim, help boost blood circulation, oxygen absorption and skin cell regeneration, and activate collagen formation – a key aspiration in anti-ageing effects. “The evidence is there,” says Ho. “Although it’s not strong.” Nevertheless, with numerous products on the market, “we don’t know whether or not the lights emitted are reflective of the research that has been done. We don’t know the duration, proper positioning requirements, the risk-benefit ratio. Many uncertainties remain.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, bacteria linked to pimples. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – although, explains the specialist, “it’s frequently employed in beauty centers.” Certain patients incorporate it into their regimen, he observes, however for consumer products, “we recommend careful testing and security confirmation. Unless it’s a medical device, standards are somewhat unclear.”

Cutting-Edge Studies and Biological Processes

Meanwhile, in a far-flung field of pioneering medical science, scientists have been studying cerebral tissue, discovering multiple mechanisms for infrared’s cellular benefits. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” 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 scientist mainly develops medications for neurological conditions, but over 20 years ago, a physician creating light-based cold sore therapy requested his biological knowledge. “He designed tools for biological testing,” he says. “I was quite suspicious. It was an unusual wavelength of about 1070 nanometres, that many assumed was biologically inert.”

Its beneficial characteristic, nevertheless, was its ability to transmit through aqueous environments, meaning it could penetrate the body more deeply.

Cellular Energy and Neurological Benefits

Additional research indicated infrared affected cellular mitochondria. Mitochondria are the powerhouses of cells, generating energy for them to function. “Every cell in your body has mitochondria, including the brain,” notes the researcher, who prioritized neurological investigations. “Studies demonstrate enhanced cerebral circulation with light treatment, which is always very good.”

With 1070 treatment, mitochondria also produce a small amount of a molecule known as reactive oxygen species. At controlled levels these compounds, explains the expert, “stimulates so-called chaperone proteins which look after your mitochondria, preserve cell function and eliminate damaged proteins.”

All of these mechanisms appear promising for treating a brain disease: antioxidant, anti-inflammatory, and pro-autophagy – autophagy representing cellular waste disposal.

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, including his own initial clinical trials in the US