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Light-based treatment is clearly enjoying a surge in popularity. You can now buy illuminated devices targeting issues like complexion problems and aging signs as well as muscle pain and oral inflammation, the latest being a dental hygiene device outfitted with small red light diodes, marketed by the company as “a breakthrough in at-home oral care.” 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. As claimed by enthusiasts, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, reducing swelling and long-term ailments as well as supporting brain health.

Understanding the Evidence

“It sounds a bit like witchcraft,” notes Paul Chazot, who has researched light therapy for two decades. Certainly, some of light’s effects on our bodies are well established. Sunlight enables vitamin D production, essential for skeletal strength, immune function, and muscular health. Light exposure controls our sleep-wake cycles, too, stimulating neurotransmitter and hormone production during daytime, and preparing the body for rest as darkness falls. Artificial sun lamps frequently help individuals with seasonal depression to boost low mood in winter. So there’s no doubt we need light energy to function well.

Various Phototherapy Approaches

Whereas seasonal affective disorder devices typically employ blue-range light, the majority of phototherapy tools use red or near-infrared wavelengths. In serious clinical research, 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. Phototherapy, or light therapy uses wavelengths around the middle of this spectrum, the highest energy of those being invisible ultraviolet, then visible light (all the colours we see in a rainbow) and then infrared (which we can see with night-vision goggles).

Dermatologists have utilized UV therapy for extensive periods to manage persistent skin disorders including eczema and psoriasis. It modulates intracellular immune mechanisms, “and suppresses swelling,” says a dermatology expert. “Substantial research supports light therapy.” UVA goes deeper into the skin than UVB, whereas the LEDs we see on consumer light-therapy devices (which generally deliver red, infrared or blue light) “generally affect surface layers.”

Safety Protocols and Medical Guidance

The side-effects of UVB exposure, such as burning or tanning, are well known but in medical devices the light is delivered in a “narrow-band” form – signifying focused frequency bands – which decreases danger. “Therapy is overseen by qualified practitioners, so the dosage is monitored,” notes the specialist. Most importantly, the light sources are adjusted by technical experts, “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.”

Consumer Devices and Evidence Gaps

Red and blue LEDs, he explains, “aren’t typically employed clinically, but they may help with certain conditions.” Red LEDs, it is proposed, help boost blood circulation, oxygen uptake and dermal rejuvenation, and activate collagen formation – an important goal for anti-aging. “The evidence is there,” comments the expert. “However, it’s limited.” Regardless, 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. Optimal treatment times are unknown, ideal distance from skin surface, whether or not that will increase the risk versus the benefit. Many uncertainties remain.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, microorganisms connected to breakouts. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – despite the fact that, notes the dermatologist, “it’s commonly used in cosmetic clinics.” Certain patients incorporate it into their regimen, he says, however for consumer products, “we just tell them to try it carefully and to make sure it has been assessed for safety. If it’s not medically certified, oversight remains ambiguous.”

Innovative Investigations and Molecular Effects

Simultaneously, in a far-flung field of pioneering medical science, researchers have been testing neural cells, revealing various pathways for light-enhanced cell function. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he says. Multiple claimed advantages have created skepticism toward light treatment – that claims seem exaggerated. Yet, experimental evidence has transformed his viewpoint.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, but over 20 years ago, a doctor developing photonic antiviral treatment consulted his scientific background. “He created some devices so that we could work with them with cells and with fruit flies,” he recalls. “I was quite suspicious. The specific wavelength measured approximately 1070nm, that many assumed was biologically inert.”

Its beneficial characteristic, though, was its ability to transmit through aqueous environments, enabling deeper tissue penetration.

Cellular Energy and Neurological Benefits

Additional research indicated infrared affected cellular mitochondria. Mitochondria are the powerhouses of cells, generating energy for them to function. “Mitochondria exist throughout the body, even within brain tissue,” 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, says Chazot, “triggers guardian proteins that maintain organelle health, protect cellular integrity and manage defective proteins.”

These processes show potential for neurological conditions: oxidative protection, swelling control, and cellular cleanup – autophagy representing cellular waste disposal.

Current Research Status and Professional Opinions

When recently reviewing 1070nm research for cognitive decline, he says, about 400 people were taking part in four studies, including his own initial clinical trials in the US