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Light-based treatment is definitely experiencing a wave of attention. Consumers can purchase illuminated devices targeting issues like dermatological concerns and fine lines as well as sore muscles and oral inflammation, the newest innovation is a toothbrush outfitted with small red light diodes, marketed by the company as “a breakthrough in personal mouth health.” 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, where instead of hot coals (real or electric) heating the air, the infrared radiation heats your body itself. Based on supporter testimonials, it feels similar to a full-body light therapy session, boosting skin collagen, soothing sore muscles, relieving inflammation and long-term ailments as well as supporting brain health.

Understanding the Evidence

“It feels almost magical,” notes a Durham University professor, a scientist who has studied phototherapy extensively. Naturally, certain impacts of light on human physiology are proven. Sunlight enables vitamin D production, needed for bone health, immunity, muscles and more. Natural light synchronizes our biological clocks, too, stimulating neurotransmitter and hormone production during daytime, and preparing the body for rest as darkness falls. Artificial sun lamps are a common remedy for people with seasonal affective disorder (Sad) 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, most other light therapy devices deploy red or infrared light. In serious clinical research, including research on infrared’s impact on neural cells, identifying the optimal wavelength is crucial. Light constitutes electromagnetic energy, spanning from low-energy radio waves to the highest-energy (gamma waves). Therapeutic light application employs mid-spectrum wavelengths, including invisible ultraviolet radiation, then visible light (all the colours we see in a rainbow) and then infrared (which we can see with night-vision goggles).

Ultraviolet treatment has been employed by skin specialists for decades to manage persistent skin disorders including eczema and psoriasis. It modulates intracellular immune mechanisms, “and dampens down inflammation,” notes a skin specialist. “There’s lots of evidence for phototherapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (which generally deliver red, infrared or blue light) “tend to be a bit more superficial.”

Safety Protocols and Medical Guidance

Potential UVB consequences, like erythema or pigmentation, are understood but clinical devices employ restricted wavelength ranges – meaning smaller wavelengths – which decreases danger. “It’s supervised by a healthcare professional, so the dosage is monitored,” explains the dermatologist. Most importantly, the lightbulbs are calibrated by medical technicians, “to ensure that the wavelength that’s being delivered is fit for purpose – 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

Red and blue light sources, he explains, “aren’t really used in the medical sense, but they may help with certain conditions.” Red light devices, some suggest, improve circulatory function, oxygen utilization and cell renewal in the skin, and activate collagen formation – a key aspiration in anti-ageing effects. “The evidence is there,” states the dermatologist. “But it’s not conclusive.” Regardless, given the plethora of available tools, “it’s unclear if device outputs match study parameters. Optimal treatment times are unknown, proper positioning requirements, whether or not that will increase the risk versus the benefit. Many uncertainties remain.”

Treatment Areas and Specialist Views

One of the earliest blue-light products targeted Cutibacterium acnes, microorganisms connected to breakouts. Research support isn’t sufficient for standard medical recommendation – despite the fact that, says Ho, “it’s frequently employed in beauty centers.” Some of his patients use it as part of their routine, he says, though when purchasing home devices, “we advise cautious experimentation and safety verification. Unless it’s a medical device, the regulation is a bit grey.”

Innovative Investigations and Molecular Effects

At the same time, in advanced research areas, researchers have been testing neural cells, discovering multiple mechanisms for infrared’s cellular benefits. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he reports. 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 researcher primarily focuses on pharmaceutical solutions for brain disorders, but over 20 years ago, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He created some devices so that we could work with them with cells and with fruit flies,” he recalls. “I was quite suspicious. It was an unusual wavelength of about 1070 nanometres, that many assumed was biologically inert.”

What it did have going for it, however, was its efficient water penetration, meaning it could penetrate the body more deeply.

Mitochondrial Impact and Cognitive Support

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. These organelles generate cellular energy, creating power for cellular operations. “All human cells contain mitochondria, particularly in neural cells,” notes the researcher, who concentrated on cerebral applications. “Research confirms improved brain blood flow with phototherapy, which is generally advantageous.”

With 1070 treatment, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In low doses this substance, explains the expert, “activates protective proteins that safeguard mitochondria, look after your cells and also deal with the unwanted proteins.”

These processes show potential for neurological conditions: oxidative protection, swelling control, and cellular cleanup – self-digestion mechanisms eliminating harmful elements.

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, comprising his early research projects