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Phototherapy is certainly having a wave of attention. Consumers can purchase illuminated devices for everything from skin conditions and wrinkles along with aching tissues and oral inflammation, recently introduced is an oral care tool equipped with tiny red LEDs, promoted by the creators as “a breakthrough for domestic dental hygiene.” Globally, 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, that employ light waves rather than traditional heat sources, your body is warmed directly by infrared light. As claimed by enthusiasts, it feels similar to a full-body light therapy session, boosting skin collagen, relaxing muscles, alleviating inflammatory responses and persistent medical issues while protecting against dementia.

The Science and Skepticism

“It sounds a bit like witchcraft,” notes Paul Chazot, a scientist who has studied phototherapy extensively. Certainly, we know light influences biological functions. Sunlight helps us make vitamin D, essential for skeletal strength, immune function, and muscular health. Light exposure controls our sleep-wake cycles, additionally, stimulating neurotransmitter and hormone production during daytime, and preparing the body for rest as darkness falls. Artificial sun lamps are a common remedy for people with seasonal affective disorder (Sad) to boost low mood in winter. Undoubtedly, light plays a vital role in human health.

Types of Light Therapy

Although mood lamps generally utilize blue-spectrum frequencies, 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. Light constitutes electromagnetic energy, spanning from low-energy radio waves to high-energy gamma radiation. Light-based treatment utilizes intermediate light frequencies, the highest energy of those being invisible ultraviolet, then visible light (all the colours we see in a rainbow) and finally infrared detectable with special equipment.

UV light has been used by medical dermatologists for many years 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 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

The side-effects of UVB exposure, including sunburn or skin darkening, are well known but in medical devices the light is delivered in a “narrow-band” form – signifying focused frequency bands – which decreases danger. “Treatment is monitored by medical staff, so the dosage is monitored,” notes the specialist. Essentially, the light sources are adjusted by technical experts, “to confirm suitable light frequency output – different from beauty salons, where regulations may be lax, and wavelength accuracy isn’t verified.”

Commercial Products and Research Limitations

Red and blue light sources, he says, “aren’t really used in the medical sense, but could assist with specific concerns.” Red wavelength therapy, proponents claim, improve circulatory function, oxygen uptake and cell renewal in the skin, and promote collagen synthesis – an important goal for anti-aging. “Studies are available,” says Ho. “But it’s not conclusive.” In any case, 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, proper positioning requirements, the risk-benefit ratio. Many uncertainties remain.”

Targeted Uses and Expert Opinions

Early blue-light applications focused on skin microbes, microorganisms connected to breakouts. Scientific backing remains inadequate for regular prescription – even though, says Ho, “it’s often seen in medical spas or aesthetics practices.” Certain patients incorporate it into their regimen, he observes, however for consumer products, “we recommend careful testing and security confirmation. Without proper medical classification, standards are somewhat unclear.”

Innovative Investigations and Molecular Effects

Meanwhile, in innovative scientific domains, Chazot has been experimenting with brain cells, revealing various pathways for light-enhanced cell function. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he reports. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that claims seem exaggerated. 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 developed equipment for cellular and insect experiments,” he explains. “I was quite suspicious. This particular frequency was around 1070 nanometers, that many assumed was biologically inert.”

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

Cellular Energy and Neurological Benefits

Growing data suggested infrared influenced energy-producing organelles. Mitochondria produce ATP for cell function, creating power for cellular operations. “Every cell in your body has 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 generally advantageous.”

Using 1070nm wavelength, energy organelles generate minimal reactive oxygen compounds. In limited quantities these molecules, says Chazot, “activates protective proteins that safeguard mitochondria, preserve cell function and eliminate damaged proteins.”

These processes show potential for neurological conditions: free radical neutralization, swelling control, and waste removal – 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, about 400 people were taking part in four studies, including his own initial clinical trials in the US