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Phototherapy is definitely experiencing a surge in popularity. You can now buy illuminated devices designed to address skin conditions and wrinkles as well as sore muscles and oral inflammation, the latest being a toothbrush enhanced with tiny red LEDs, described by its makers as “a breakthrough for domestic dental hygiene.” Internationally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn 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, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, alleviating inflammatory responses and long-term ailments as well as supporting brain health.

The Science and Skepticism

“It feels almost magical,” observes a Durham University professor, a scientist who has studied phototherapy extensively. Of course, certain impacts of light on human physiology are proven. Sunlight enables vitamin D production, essential for skeletal strength, immune function, and muscular health. Natural light synchronizes our biological clocks, additionally, triggering the release of neurochemicals and hormones while we are awake, and winding down bodily functions for sleep as it fades into night. Artificial sun lamps are a common remedy for people with seasonal affective disorder (Sad) to combat seasonal emotional slumps. Undoubtedly, light plays a vital role in human health.

Types of Light Therapy

Although mood lamps generally utilize blue-spectrum frequencies, most other light therapy devices deploy red or infrared light. During advanced medical investigations, including research on infrared’s impact on neural cells, determining the precise frequency is essential. Light constitutes electromagnetic energy, spanning from low-energy radio waves to short-wavelength gamma rays. Phototherapy, or light therapy uses wavelengths around the middle of this spectrum, with ultraviolet representing the higher energy invisible light, followed by visible light encompassing rainbow 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 modulates intracellular immune mechanisms, “and reduces inflammatory processes,” notes a skin specialist. “Considerable data validates phototherapy.” UVA penetrates skin more deeply than UVB, whereas the LEDs we see on consumer light-therapy devices (typically emitting red, infrared or blue wavelengths) “generally affect surface layers.”

Safety Protocols and Medical Guidance

Potential UVB consequences, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – which minimises the risks. “Treatment is monitored by medical staff, meaning intensity is regulated,” explains the dermatologist. Essentially, the devices are tuned by qualified personnel, “to confirm suitable light frequency output – different from beauty salons, where regulations may be lax, and we don’t really know what wavelengths are being used.”

Consumer Devices and Evidence Gaps

Red and blue LEDs, he notes, “aren’t typically employed clinically, though they might benefit some issues.” Red LEDs, it is proposed, help boost blood circulation, oxygen utilization and dermal rejuvenation, and promote collagen synthesis – a primary objective in youth preservation. “Research exists,” states the dermatologist. “Although it’s not strong.” In any case, with numerous products on the market, “we’re uncertain whether commercial devices replicate research conditions. Optimal treatment times are unknown, proper positioning requirements, the risk-benefit ratio. Many uncertainties remain.”

Specific Applications and Professional Perspectives

Early blue-light applications focused on skin microbes, a microbe associated with acne. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – despite the fact that, explains the specialist, “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 recommend careful testing and security confirmation. Without proper medical classification, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

Meanwhile, in a far-flung field of pioneering medical science, Chazot has been experimenting with brain cells, discovering multiple mechanisms for infrared’s cellular benefits. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he says. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that results appear unrealistic. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, but over 20 years ago, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He designed tools for biological testing,” he explains. “I was pretty sceptical. It was an unusual wavelength of about 1070 nanometres, that many assumed was biologically inert.”

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

Additional research indicated infrared affected cellular mitochondria. These organelles generate cellular energy, creating power for cellular operations. “Every cell in your body has mitochondria, particularly in neural cells,” notes the researcher, who concentrated on cerebral applications. “Studies demonstrate enhanced cerebral circulation with light treatment, which is generally advantageous.”

Using 1070nm wavelength, cellular power plants create limited oxidative molecules. In low doses this substance, notes the scientist, “stimulates so-called chaperone proteins which look after your mitochondria, protect cellular integrity and manage defective proteins.”

All of these mechanisms appear promising for treating a brain disease: antioxidant, swelling control, and waste removal – self-digestion mechanisms eliminating harmful elements.

Current Research Status and Professional Opinions

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, incorporating his preliminary American studies