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Light-based treatment is definitely experiencing a surge in popularity. Consumers can purchase glowing gadgets designed to address complexion problems and aging signs along with sore muscles and oral inflammation, the latest being a dental hygiene device equipped with miniature red light sources, marketed by the company 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, the infrared radiation heats your body itself. According to its devotees, the experience resembles using an LED facial mask, enhancing collagen production, soothing sore muscles, relieving inflammation and chronic health conditions as well as supporting brain health.

The Science and Skepticism

“It feels almost magical,” observes Paul Chazot, a scientist who has studied phototherapy extensively. Of course, some of light’s effects on our bodies are well established. Sunlight enables vitamin D production, crucial for strong bones, immune defense, and tissue repair. Natural light synchronizes our biological clocks, as well, activating brain chemicals and hormonal responses in daylight, and winding down bodily functions for sleep as it fades into night. Artificial sun lamps are standard treatment for winter mood disorders to boost low mood in winter. Clearly, light energy is essential for optimal functioning.

Different Light Modalities

Although mood lamps generally utilize blue-spectrum frequencies, 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, determining the precise frequency is essential. Photons represent electromagnetic waves, extending from long-wavelength radiation to high-energy gamma radiation. Therapeutic light application employs mid-spectrum wavelengths, including invisible ultraviolet radiation, then visible light (all the colours we see in a rainbow) and infrared light visible through night vision technology.

UV light has been used by medical dermatologists for many years to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It modulates intracellular immune mechanisms, “and dampens down inflammation,” explains a skin specialist. “Substantial research supports light therapy.” UVA penetrates skin more deeply than UVB, while the LEDs in consumer devices (which generally deliver red, infrared or blue light) “generally affect surface layers.”

Risk Assessment and Professional Supervision

The side-effects of UVB exposure, including sunburn or skin darkening, are recognized but medical equipment uses controlled narrow-band delivery – meaning smaller wavelengths – which minimises the risks. “Treatment is monitored by medical staff, so the dosage is monitored,” notes the specialist. And crucially, the light sources are adjusted by technical experts, “to ensure that the wavelength that’s being delivered is fit for purpose – as opposed to commercial tanning facilities, where it’s a bit unregulated, and we don’t really know what wavelengths are being used.”

Home Devices and Scientific Uncertainty

Red and blue LEDs, he explains, “aren’t typically employed clinically, though they might benefit some issues.” Red LEDs, it is proposed, enhance blood flow, oxygen utilization and skin cell regeneration, and activate collagen formation – a primary objective in youth preservation. “The evidence is there,” comments the expert. “But it’s not conclusive.” Regardless, with numerous products on the market, “we’re uncertain whether commercial devices replicate research conditions. Optimal treatment times are unknown, how close the lights should be to the skin, if benefits outweigh potential risks. Numerous concerns persist.”

Treatment Areas and Specialist Views

One of the earliest blue-light products targeted Cutibacterium acnes, a microbe associated with acne. Research support isn’t sufficient for standard medical recommendation – although, notes the dermatologist, “it’s frequently employed in beauty centers.” Certain patients incorporate it into their regimen, he observes, but if they’re buying a device for home use, “we advise cautious experimentation and safety verification. If it’s not medically certified, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

Meanwhile, in innovative scientific domains, Chazot has been experimenting with brain cells, revealing various pathways for light-enhanced cell function. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he reports. Multiple claimed advantages have created skepticism toward light treatment – that claims seem exaggerated. However, scientific investigation has altered his perspective.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, but over 20 years ago, 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 says. “I was quite suspicious. The specific wavelength measured approximately 1070nm, which most thought had no biological effect.”

What it did have going for it, however, was that it travelled through water easily, meaning it could penetrate the body more deeply.

Mitochondrial Effects and Brain Health

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. These organelles generate cellular energy, generating energy for them to function. “Mitochondria exist throughout the body, particularly in neural cells,” notes the researcher, who prioritized neurological investigations. “It has been shown that in humans this light therapy increases blood flow into the brain, which is consistently beneficial.”

Using 1070nm wavelength, cellular power plants create limited oxidative molecules. In limited quantities these molecules, notes the scientist, “stimulates so-called chaperone proteins which look after your mitochondria, preserve cell function and eliminate damaged proteins.”

These processes show potential for neurological conditions: antioxidant, anti-inflammatory, and waste removal – self-digestion mechanisms eliminating harmful elements.

Current Research Status and Professional Opinions

Upon examining current studies on light therapy for dementia, he states, about 400 people were taking part in four studies, incorporating his preliminary American studies