🔗 Share this article

Light-based treatment is definitely experiencing a surge in popularity. Consumers can purchase light-emitting tools designed to address dermatological concerns and fine lines to sore muscles and oral inflammation, recently introduced is an oral care tool enhanced with miniature red light sources, marketed by the company as “a breakthrough for domestic dental hygiene.” Globally, 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, that employ light waves rather than traditional heat sources, the infrared radiation heats your body itself. As claimed by enthusiasts, the experience resembles using an LED facial mask, boosting skin collagen, easing muscle tension, alleviating inflammatory responses and persistent medical issues and potentially guarding against cognitive decline.

Research and Reservations

“It feels almost magical,” observes a Durham University professor, a scientist who has studied phototherapy extensively. Certainly, certain impacts of light on human physiology are proven. Sunlight enables vitamin D production, crucial for strong bones, immune defense, and tissue repair. Natural light synchronizes our biological clocks, too, stimulating neurotransmitter and hormone production during daytime, and signaling the body to slow down for nighttime. Sunlight-imitating lamps frequently help individuals with seasonal depression to combat seasonal emotional slumps. So there’s no doubt we need light energy to function well.

Types of Light Therapy

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, consumer light therapy products mostly feature red and infrared emissions. During advanced medical investigations, like examinations of infrared influence on cerebral tissue, determining the precise frequency is essential. Light is a form of electromagnetic radiation, spanning from low-energy radio waves to the highest-energy (gamma waves). Light-based treatment utilizes intermediate light frequencies, 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 for addressing long-term dermatological issues like vitiligo. It modulates intracellular immune mechanisms, “and suppresses swelling,” explains a skin specialist. “Substantial research supports light therapy.” UVA goes deeper into the skin than UVB, whereas the LEDs we see on consumer light-therapy devices (usually producing colored light emissions) “generally affect surface layers.”

Safety Protocols and Medical Guidance

UVB radiation effects, like erythema or pigmentation, are well known but in medical devices the light is delivered in a “narrow-band” form – signifying focused frequency bands – that reduces potential hazards. “Treatment is monitored by medical staff, thus exposure is controlled,” says Ho. And crucially, the devices are tuned by qualified personnel, “to guarantee appropriate wavelength emission – unlike in tanning salons, where regulations may be lax, and we don’t really know what wavelengths are being used.”

Home Devices and Scientific Uncertainty

Colored light diodes, he explains, “don’t have strong medical applications, though they might benefit some issues.” Red LEDs, it is proposed, enhance blood flow, oxygen absorption and skin cell regeneration, and stimulate collagen production – a primary objective in youth preservation. “The evidence is there,” states the dermatologist. “Although it’s not strong.” Nevertheless, amid the sea of devices now available, “it’s unclear if device outputs match study parameters. Optimal treatment times are unknown, ideal distance from skin surface, if benefits outweigh potential risks. Numerous concerns persist.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, bacteria linked to pimples. Research support isn’t sufficient for standard medical recommendation – although, explains the specialist, “it’s frequently employed in beauty centers.” Individuals include it in their skincare practices, he says, though when purchasing home devices, “we just tell them to try it carefully and to make sure it has been assessed for safety. Without proper medical classification, oversight remains ambiguous.”

Cutting-Edge Studies and Biological Processes

At the same time, in a far-flung field of pioneering medical science, 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 states. Multiple claimed advantages have created skepticism toward light treatment – that it’s too good to be true. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, but over 20 years ago, a doctor developing photonic antiviral treatment consulted his scientific background. “He designed tools for biological testing,” he explains. “I remained doubtful. This particular frequency was around 1070 nanometers, that nobody believed did anything biological.”

What it did have going for it, however, was that it travelled through water easily, allowing substantial bodily penetration.

Mitochondrial Effects and Brain Health

Additional research indicated infrared affected cellular mitochondria. Mitochondria are the powerhouses of cells, producing fuel for biological processes. “Every cell in your body has mitochondria, particularly in neural cells,” explains the neuroscientist, who prioritized neurological investigations. “Studies demonstrate enhanced cerebral circulation with light treatment, which is always very good.”

With 1070 treatment, energy organelles generate minimal reactive oxygen compounds. In low doses this substance, notes the scientist, “stimulates so-called chaperone proteins which look after your mitochondria, preserve cell function and eliminate damaged proteins.”

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

Current Research Status and Professional Opinions

Upon examining current studies on light therapy for dementia, he reports, about 400 people were taking part in four studies, including his own initial clinical trials in the US