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Light therapy is clearly enjoying a surge in popularity. Consumers can purchase illuminated devices designed to address complexion problems and aging signs to muscle pain and oral inflammation, the latest being an oral care tool equipped with small red light diodes, promoted by the creators as “a major advance in at-home oral care.” Worldwide, 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. As claimed by enthusiasts, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, soothing sore muscles, reducing swelling and persistent medical issues while protecting against dementia.

Research and Reservations

“It feels almost magical,” notes a Durham University professor, professor in neuroscience at Durham University and a convert to the value of light therapy. Of course, 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. Natural light synchronizes our biological clocks, too, stimulating neurotransmitter and hormone production during daytime, and signaling the body to slow down for nighttime. Daylight-simulating devices are a common remedy for people with seasonal affective disorder (Sad) to boost low mood in winter. So there’s no doubt we need light energy to function well.

Various Phototherapy Approaches

Whereas seasonal affective disorder devices typically employ blue-range light, 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, identifying the optimal wavelength is crucial. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to short-wavelength gamma rays. Phototherapy, or light therapy 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.

UV light has been used by medical dermatologists for many years to manage persistent skin disorders including eczema and psoriasis. It affects cellular immune responses, “and dampens down inflammation,” explains a dermatology expert. “Considerable data validates phototherapy.” UVA reaches deeper skin layers compared to UVB, whereas the LEDs we see on consumer light-therapy devices (typically emitting red, infrared or blue wavelengths) “tend to be a bit more superficial.”

Risk Assessment and Professional Supervision

UVB radiation effects, like erythema or pigmentation, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – which decreases danger. “Treatment is monitored by medical staff, so the dosage is monitored,” says Ho. Essentially, the devices are tuned by qualified personnel, “to confirm suitable light frequency output – as opposed to commercial tanning facilities, where regulations may be lax, and wavelength accuracy isn’t verified.”

Home Devices and Scientific Uncertainty

Red and blue LEDs, he notes, “don’t have strong medical applications, but could assist with specific concerns.” Red wavelength therapy, proponents claim, enhance blood flow, oxygen utilization and cell renewal in the skin, and activate collagen formation – a key aspiration in anti-ageing effects. “Studies are available,” states the dermatologist. “But it’s not conclusive.” Regardless, 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. Optimal treatment times are unknown, ideal distance from skin surface, the risk-benefit ratio. There are lots of questions.”

Targeted Uses and Expert Opinions

Early blue-light applications focused on skin microbes, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – despite the fact that, explains the specialist, “it’s frequently employed in beauty centers.” Certain patients incorporate it into their regimen, he observes, but if they’re buying a device for home use, “we advise cautious experimentation and safety verification. If it’s not medically certified, standards are somewhat unclear.”

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. 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.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, however two decades past, a doctor developing photonic antiviral treatment consulted his scientific background. “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.”

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

Cellular Energy and Neurological Benefits

Additional research indicated infrared affected cellular mitochondria. Mitochondria are the powerhouses of cells, producing fuel for biological processes. “Every cell in your body has mitochondria, particularly in neural cells,” explains the neuroscientist, who concentrated on cerebral applications. “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. In low doses this substance, says Chazot, “stimulates so-called chaperone proteins which look after your mitochondria, protect cellular integrity and manage defective proteins.”

Such mechanisms indicate hope for cognitive disorders: oxidative protection, swelling control, and waste removal – autophagy representing cellular waste disposal.

Present Investigation Status and Expert Assessments

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