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Phototherapy is clearly enjoying a moment. You can now buy light-emitting tools designed to address skin conditions and wrinkles to muscle pain and oral inflammation, recently introduced is a toothbrush outfitted with small red light diodes, described by its makers as “a breakthrough in personal mouth health.” Globally, the sector valued at $1bn last year is expected to increase to $1.8bn within the next decade. You can even go and sit in an infrared sauna, that employ light waves rather than traditional heat sources, your body is warmed directly by infrared light. According to its devotees, the experience resembles using an LED facial mask, stimulating skin elasticity, easing muscle tension, relieving inflammation and chronic health conditions while protecting against dementia.

Understanding the Evidence

“It feels almost magical,” notes a Durham University professor, a scientist who has studied phototherapy extensively. Certainly, some of light’s effects on our bodies are well established. Sunlight enables vitamin D production, needed for bone health, immunity, muscles and more. Sunlight regulates our circadian rhythms, too, stimulating neurotransmitter and hormone production during daytime, and preparing the body for rest as darkness falls. Artificial sun lamps are standard treatment for winter mood disorders to elevate spirits during colder months. Undoubtedly, light plays a vital role in human health.

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. In rigorous scientific studies, including research on infrared’s impact on neural cells, finding the right frequency is key. Light constitutes electromagnetic energy, spanning from low-energy radio waves to high-energy gamma radiation. Phototherapy, or light therapy uses wavelengths around the middle of this spectrum, including invisible ultraviolet radiation, then visible light (all the colours we see in a rainbow) and infrared light visible through night vision technology.

Dermatologists have utilized UV therapy for extensive periods to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It works on the immune system within cells, “and dampens down inflammation,” explains a skin specialist. “Substantial research supports light therapy.” UVA reaches deeper skin layers compared to UVB, in contrast to LEDs in commercial products (usually producing colored light emissions) “typically have shallower penetration.”

Safety Protocols and Medical Guidance

The side-effects of UVB exposure, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – indicating limited wavelength spectrum – which minimises the risks. “It’s supervised by a healthcare professional, meaning intensity is regulated,” notes the specialist. And crucially, the devices are tuned by qualified personnel, “to ensure that the wavelength that’s being delivered is fit for purpose – different from beauty 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 notes, “aren’t really used in the medical sense, though they might benefit some issues.” Red light devices, some suggest, help boost blood circulation, oxygen uptake and skin cell regeneration, and stimulate collagen production – a primary objective in youth preservation. “Studies are available,” states the dermatologist. “However, it’s limited.” Regardless, amid the sea of devices now available, “we’re uncertain whether commercial devices replicate research conditions. Optimal treatment times are unknown, proper positioning requirements, if benefits outweigh potential risks. Numerous concerns persist.”

Specific Applications and Professional Perspectives

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.” Some of his patients use it as part of their routine, he observes, however for consumer products, “we advise cautious experimentation and safety verification. If it’s not medically certified, the regulation is a bit grey.”

Innovative Investigations and Molecular Effects

Meanwhile, in advanced research areas, 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 results appear unrealistic. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, though twenty years earlier, a physician creating light-based cold sore therapy requested his biological knowledge. “He developed equipment for cellular and insect experiments,” he says. “I was quite suspicious. This particular frequency was around 1070 nanometers, that nobody believed did anything biological.”

What it did have going for it, however, was its ability to transmit through aqueous environments, enabling deeper tissue penetration.

Cellular Energy and Neurological Benefits

Growing data suggested infrared influenced energy-producing organelles. Mitochondria produce ATP for cell function, producing fuel for biological processes. “Mitochondria exist throughout the body, including the brain,” explains the neuroscientist, 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 specific frequency application, mitochondria also produce a small amount of a molecule known as reactive oxygen species. At controlled levels these compounds, notes the scientist, “triggers guardian proteins that maintain organelle health, preserve cell function and eliminate damaged proteins.”

These processes show potential for neurological conditions: oxidative protection, swelling control, and waste removal – autophagy being the process the cell uses to clear unwanted damaging proteins.

Ongoing Study Progress and Specialist Evaluations

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, including his own initial clinical trials in the US