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Phototherapy is clearly enjoying a moment. Consumers can purchase glowing gadgets designed to address skin conditions and wrinkles along with sore muscles and gum disease, the latest being an oral care tool enhanced with miniature red light sources, marketed by the company as “a significant discovery in personal mouth health.” Worldwide, 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, which use infrared light to warm the body directly, your body is warmed directly by infrared light. According to its devotees, the experience resembles using an LED facial mask, enhancing collagen production, easing muscle tension, reducing swelling and long-term ailments while protecting against dementia.

The Science and Skepticism

“It feels almost magical,” notes Paul Chazot, a scientist who has studied phototherapy extensively. Certainly, some of light’s effects on our bodies are well established. Our bodies produce vitamin D through sun exposure, crucial for strong bones, immune defense, and tissue repair. Natural light synchronizes our biological clocks, too, activating brain chemicals and hormonal responses in daylight, and preparing the body for rest as darkness falls. Daylight-simulating devices frequently help individuals with seasonal depression to combat seasonal emotional slumps. 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, such as Chazot’s investigations into the effects of infrared on brain cells, determining the precise frequency is essential. Light is a form of electromagnetic radiation, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to short-wavelength gamma rays. Therapeutic light application 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 treat chronic skin conditions such as eczema, psoriasis and vitiligo. It affects cellular immune responses, “and suppresses swelling,” notes a dermatology expert. “Substantial research supports light therapy.” UVA reaches deeper skin layers compared to UVB, in contrast to LEDs in commercial products (typically emitting red, infrared or blue wavelengths) “typically have shallower penetration.”

Safety Considerations and Medical Oversight

The side-effects of UVB exposure, like erythema or pigmentation, are recognized but medical equipment uses controlled narrow-band delivery – meaning smaller wavelengths – that reduces potential hazards. “It’s supervised by a healthcare professional, thus exposure is controlled,” notes the specialist. Most importantly, the lightbulbs are calibrated by medical technicians, “to confirm suitable light frequency output – unlike in tanning salons, where it’s a bit unregulated, and we don’t really know what wavelengths are being used.”

Home Devices and Scientific Uncertainty

Colored light diodes, he says, “aren’t typically employed clinically, though they might benefit some issues.” Red wavelength therapy, proponents claim, enhance blood flow, oxygen absorption and cell renewal in the skin, and promote collagen synthesis – a primary objective in youth preservation. “The evidence is there,” says Ho. “However, it’s limited.” Regardless, given the plethora of available tools, “it’s unclear if device outputs match study parameters. Appropriate exposure periods aren’t established, proper positioning requirements, the risk-benefit ratio. Many uncertainties remain.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, a microbe associated with acne. Scientific backing remains inadequate for regular prescription – although, 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. Unless it’s a medical device, oversight remains ambiguous.”

Cutting-Edge Studies and Biological Processes

At the same time, in advanced research areas, researchers have been testing neural cells, identifying a number of ways in which infrared can boost cellular health. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he states. Multiple claimed advantages have created skepticism toward light treatment – that it’s too good to be true. 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 doctor developing photonic antiviral treatment consulted his scientific background. “He developed equipment for cellular and insect experiments,” he explains. “I was pretty sceptical. This particular frequency was around 1070 nanometers, that nobody believed did anything biological.”

What it did have going for it, though, was its ability to transmit through aqueous environments, meaning it could penetrate the body more deeply.

Mitochondrial Effects and Brain Health

Growing data suggested infrared influenced energy-producing organelles. These organelles generate cellular energy, creating power for cellular operations. “Mitochondria exist throughout the body, particularly in neural cells,” says Chazot, who, as a neuroscientist, decided to focus the research on brain cells. “Research confirms improved brain blood flow with phototherapy, which is generally advantageous.”

With 1070 treatment, energy organelles generate minimal reactive oxygen compounds. In limited quantities these molecules, explains the expert, “stimulates so-called chaperone proteins which look after your mitochondria, look after your cells and also deal with the unwanted proteins.”

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

Current Research Status and Professional Opinions

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