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Phototherapy is clearly enjoying a wave of attention. There are now available light-emitting tools targeting issues like complexion problems and aging signs along with muscle pain and gum disease, the latest being a toothbrush enhanced with miniature red light sources, marketed by the company as “a significant discovery for domestic dental hygiene.” Internationally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn 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. Based on supporter testimonials, the experience resembles using an LED facial mask, enhancing collagen production, easing muscle tension, reducing swelling and persistent medical issues while protecting against dementia.

Understanding the Evidence

“It appears somewhat mystical,” notes a neuroscience expert, a scientist who has studied phototherapy extensively. Naturally, some of light’s effects on our bodies are well established. Sunlight helps us make vitamin D, needed for bone health, immunity, muscles and more. Sunlight regulates our circadian rhythms, as well, activating brain chemicals and hormonal responses in daylight, and winding down bodily functions for sleep as it fades into night. Daylight-simulating devices frequently help individuals with seasonal depression to elevate spirits during colder months. Clearly, light energy is essential for optimal functioning.

Different Light Modalities

Whereas seasonal affective disorder devices typically employ blue-range light, consumer light therapy products mostly feature red and infrared emissions. During advanced medical investigations, such as Chazot’s investigations into the effects of infrared on brain cells, finding the right frequency is key. Light constitutes electromagnetic energy, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to the highest-energy (gamma waves). Light-based treatment employs mid-spectrum wavelengths, with ultraviolet representing the higher energy invisible light, then the visible spectrum we perceive as colors 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 affects cellular immune responses, “and reduces inflammatory processes,” notes a dermatology expert. “Substantial research supports light therapy.” UVA penetrates skin more deeply than UVB, whereas the LEDs we see on consumer light-therapy devices (usually producing colored light emissions) “typically have shallower penetration.”

Safety Protocols and Medical Guidance

UVB radiation effects, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – meaning smaller wavelengths – which decreases danger. “Therapy is overseen by qualified practitioners, meaning intensity is regulated,” says Ho. And crucially, the devices are tuned by qualified personnel, “to confirm suitable light frequency output – different from beauty salons, where oversight might be limited, and wavelength accuracy isn’t verified.”

Commercial Products and Research Limitations

Red and blue LEDs, he notes, “don’t have strong medical applications, but they may help with certain conditions.” 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.” Nevertheless, amid the sea of devices now available, “we don’t know whether or not the lights emitted are reflective of the research that has been done. Appropriate exposure periods aren’t established, how close the lights should be to the skin, if benefits outweigh potential risks. Many uncertainties remain.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – even though, notes the dermatologist, “it’s often seen in medical spas or aesthetics practices.” Individuals include it in their skincare practices, he mentions, however for consumer products, “we advise cautious experimentation and safety verification. Unless it’s a medical device, standards are somewhat unclear.”

Innovative Investigations and Molecular Effects

Simultaneously, in a far-flung field of pioneering medical science, scientists have been studying cerebral tissue, revealing various pathways for light-enhanced cell function. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he states. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that claims seem exaggerated. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, however two decades past, a physician creating light-based cold sore therapy requested his biological knowledge. “He created some devices so that we could work with them with cells and with fruit flies,” he explains. “I was quite suspicious. This particular frequency was around 1070 nanometers, that many assumed was biologically inert.”

The advantage it possessed, nevertheless, was its ability to transmit through aqueous environments, enabling deeper tissue penetration.

Cellular Energy and Neurological Benefits

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. Mitochondria are the powerhouses of cells, creating power for cellular operations. “Every cell in your body has mitochondria, even within brain tissue,” says Chazot, who, as a neuroscientist, decided to focus the research on brain cells. “Research confirms improved brain blood flow with phototherapy, which is consistently beneficial.”

With 1070 treatment, energy organelles generate minimal reactive oxygen compounds. In limited quantities these molecules, notes the scientist, “triggers guardian proteins that maintain organelle health, preserve cell function and eliminate damaged proteins.”

All of these mechanisms appear promising for treating a brain disease: oxidative protection, anti-inflammatory, and waste removal – autophagy representing cellular waste disposal.

Present Investigation Status and Expert Assessments

When recently reviewing 1070nm research for cognitive decline, he states, several hundred individuals participated in various investigations, comprising his early research projects