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Light therapy is certainly having a moment. There are now available glowing gadgets targeting issues like dermatological concerns and fine lines along with aching tissues and gum disease, the newest innovation is an oral care tool equipped with tiny red LEDs, promoted by the creators as “a major advance in personal mouth health.” Internationally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. Options include full-body infrared sauna sessions, where instead of hot coals (real or electric) heating the air, the infrared radiation heats your body itself. Based on supporter testimonials, it’s like bathing in one of those LED-lit beauty masks, enhancing collagen production, easing muscle tension, relieving inflammation and chronic health conditions while protecting against dementia.

Research and Reservations

“It sounds a bit like witchcraft,” says a neuroscience expert, professor in neuroscience at Durham University and a convert to the value of light therapy. Certainly, some of light’s effects on our bodies are well established. Sunlight helps us make vitamin D, crucial for strong bones, immune defense, and tissue repair. Natural light synchronizes our biological clocks, as well, 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 elevate spirits during colder months. Undoubtedly, light plays a vital role in human health.

Different Light Modalities

Although mood lamps generally utilize blue-spectrum frequencies, consumer light therapy products mostly feature red and infrared emissions. In rigorous scientific studies, like examinations of infrared influence on cerebral tissue, determining the precise frequency is essential. Light constitutes electromagnetic energy, spanning from low-energy radio waves to short-wavelength gamma rays. Light-based treatment employs mid-spectrum wavelengths, the highest energy of those being invisible ultraviolet, followed by visible light encompassing rainbow colors and finally infrared detectable with special equipment.

Dermatologists have utilized UV therapy for extensive periods for addressing long-term dermatological issues like vitiligo. It affects cellular immune responses, “and reduces inflammatory processes,” says Dr Bernard Ho. “Considerable data validates phototherapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (which generally deliver red, infrared or blue light) “tend to be a bit more superficial.”

Risk Assessment and Professional Supervision

UVB radiation effects, including sunburn or skin darkening, are understood but clinical devices employ restricted wavelength ranges – indicating limited wavelength spectrum – that reduces potential hazards. “Therapy is overseen by qualified practitioners, meaning intensity is regulated,” explains the dermatologist. Essentially, the lightbulbs are calibrated by medical technicians, “to ensure that the wavelength that’s being delivered is fit for purpose – as opposed to commercial tanning facilities, where regulations may be lax, and emission spectra aren’t confirmed.”

Home Devices and Scientific Uncertainty

Colored light diodes, 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 utilization and skin cell regeneration, and promote collagen synthesis – a key aspiration in anti-ageing effects. “Studies are available,” states the dermatologist. “Although it’s not strong.” Regardless, 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, ideal distance from skin surface, the risk-benefit ratio. Numerous concerns persist.”

Treatment Areas and Specialist Views

One of the earliest blue-light products targeted Cutibacterium acnes, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – although, notes the dermatologist, “it’s often seen in medical spas or aesthetics practices.” Certain patients incorporate it into their regimen, he observes, but if they’re buying a device for home use, “we just tell them to try it carefully and to make sure it has been assessed for safety. If it’s not medically certified, standards are somewhat unclear.”

Advanced Research and Cellular Mechanisms

Meanwhile, in innovative scientific domains, researchers have been testing neural cells, discovering multiple mechanisms for infrared’s cellular benefits. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he states. The numerous reported benefits have generated doubt regarding phototherapy – 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, but over 20 years ago, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He created some devices so that we could work with them with cells and with fruit flies,” he recalls. “I was pretty sceptical. The specific wavelength measured approximately 1070nm, that nobody believed did anything biological.”

What it did have going for it, however, was its ability to transmit through aqueous environments, allowing substantial bodily penetration.

Cellular Energy and Neurological Benefits

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,” notes the researcher, who, as a neuroscientist, decided to focus the research on brain cells. “Studies demonstrate enhanced cerebral circulation with light treatment, which is always very good.”

With specific frequency application, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In limited quantities these molecules, explains the expert, “activates protective proteins that safeguard mitochondria, look after your cells and also deal with the unwanted proteins.”

All of these mechanisms appear promising for treating a brain disease: oxidative protection, inflammation reduction, and pro-autophagy – autophagy being the process the cell uses to clear unwanted damaging proteins.

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, comprising his early research projects