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Light therapy is clearly enjoying a surge in popularity. There are now available light-emitting tools targeting issues like skin conditions and wrinkles to sore muscles and gum disease, the newest innovation is a toothbrush enhanced with tiny red LEDs, described by its makers as “a breakthrough for domestic dental hygiene.” Internationally, 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, your body is warmed directly by infrared light. As claimed by enthusiasts, the experience resembles using an LED facial mask, enhancing collagen production, soothing sore muscles, alleviating inflammatory responses and chronic health conditions and potentially guarding against cognitive decline.

The Science and Skepticism

“It feels almost magical,” observes a neuroscience expert, who has researched light therapy for two decades. Certainly, some of light’s effects on our bodies are well established. Our bodies produce vitamin D through sun exposure, essential for skeletal strength, immune function, and muscular health. Sunlight regulates our circadian rhythms, as well, stimulating neurotransmitter and hormone production during daytime, and winding down bodily functions for sleep as it fades into night. Sunlight-imitating lamps frequently help individuals with seasonal depression to elevate spirits during colder months. Clearly, light energy is essential for optimal functioning.

Types of Light Therapy

Although mood lamps generally utilize blue-spectrum frequencies, most other light therapy devices deploy red or infrared light. In rigorous scientific studies, including research on infrared’s impact on neural cells, finding the right frequency is key. Photons represent electromagnetic waves, spanning from low-energy radio waves to short-wavelength gamma rays. Light-based treatment utilizes intermediate light frequencies, with ultraviolet representing the higher energy invisible light, then the visible spectrum we perceive as colors and finally infrared detectable with special equipment.

Dermatologists have utilized UV therapy for extensive periods to manage persistent skin disorders including eczema and psoriasis. It affects cellular immune responses, “and dampens down inflammation,” notes a skin specialist. “Considerable data validates phototherapy.” UVA penetrates skin more deeply than UVB, in contrast to LEDs in commercial products (usually producing colored light emissions) “tend to be a bit more superficial.”

Safety Protocols and Medical Guidance

UVB radiation effects, such as burning or tanning, are understood but clinical devices employ restricted wavelength ranges – indicating limited wavelength spectrum – which decreases danger. “Treatment is monitored by medical staff, thus exposure is controlled,” notes the specialist. Most importantly, the light sources are adjusted by technical experts, “to confirm suitable light frequency output – 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 notes, “aren’t typically employed clinically, but could assist with specific concerns.” Red LEDs, it is proposed, improve circulatory function, oxygen utilization and cell renewal in the skin, and activate collagen formation – a primary objective in youth preservation. “Research exists,” states the dermatologist. “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, ideal distance from skin surface, whether or not that will increase the risk versus the benefit. Numerous concerns persist.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, microorganisms connected to breakouts. Research support isn’t sufficient for standard medical recommendation – even though, says Ho, “it’s commonly used in cosmetic clinics.” Some of his patients use it as part of their routine, 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. Without proper medical classification, the regulation is a bit grey.”

Cutting-Edge Studies and Biological Processes

At the same time, in advanced research areas, scientists have been studying cerebral tissue, identifying a number of ways in which infrared can boost cellular health. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he says. 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.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, 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 remained doubtful. It was an unusual wavelength of about 1070 nanometres, that nobody believed did anything biological.”

The advantage it possessed, though, was its efficient water penetration, enabling deeper tissue penetration.

Cellular Energy and Neurological Benefits

Additional research indicated infrared affected cellular mitochondria. These organelles generate cellular energy, producing fuel for biological processes. “Mitochondria exist throughout the body, particularly in neural cells,” explains the neuroscientist, who prioritized neurological investigations. “Research confirms improved brain blood flow with phototherapy, which is always very good.”

With specific frequency application, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In low doses this substance, notes the scientist, “activates protective proteins that safeguard mitochondria, protect cellular integrity and manage defective proteins.”

All of these mechanisms appear promising for treating a brain disease: free radical neutralization, anti-inflammatory, and pro-autophagy – 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, several hundred individuals participated in various investigations, including his own initial clinical trials in the US