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Light therapy is definitely experiencing a moment. There are now available illuminated devices targeting issues like complexion problems and aging signs to aching tissues and gum disease, recently introduced is a toothbrush equipped with tiny red LEDs, promoted by the creators as “a major advance in personal mouth health.” Globally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. There are even infrared saunas available, where instead of hot coals (real or electric) heating the air, the infrared radiation heats your body itself. As claimed by enthusiasts, it’s like bathing in one of those LED-lit beauty masks, stimulating skin elasticity, easing muscle tension, relieving inflammation and chronic health conditions as well as supporting brain health.

Understanding the Evidence

“It sounds a bit like witchcraft,” observes Paul Chazot, a scientist who has studied phototherapy extensively. Naturally, some of light’s effects on our bodies are well established. Sunlight helps us make vitamin D, crucial for strong bones, immune defense, and tissue repair. Sunlight regulates our circadian rhythms, too, stimulating neurotransmitter and hormone production during daytime, and preparing the body for rest as darkness falls. Sunlight-imitating lamps are a common remedy for people with seasonal affective disorder (Sad) to elevate spirits during colder months. Clearly, light energy is essential for optimal functioning.

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, identifying the optimal wavelength is crucial. Photons represent electromagnetic waves, spanning from low-energy radio waves to short-wavelength gamma rays. Light-based treatment employs mid-spectrum wavelengths, with ultraviolet representing the higher energy invisible light, then visible light (all the colours we see in a rainbow) and then infrared (which we can see with night-vision goggles).

UV light has been used by medical dermatologists for many years for addressing long-term dermatological issues like vitiligo. It modulates intracellular immune mechanisms, “and suppresses swelling,” notes a skin specialist. “There’s lots of evidence for phototherapy.” 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) “tend to be a bit more superficial.”

Safety Considerations and Medical Oversight

Potential UVB consequences, like erythema or pigmentation, are understood but clinical devices employ restricted wavelength ranges – indicating limited wavelength spectrum – which decreases danger. “Therapy is overseen by qualified practitioners, thus exposure is controlled,” notes the specialist. Most importantly, the light sources are adjusted by technical experts, “to confirm suitable light frequency output – as opposed to commercial tanning facilities, where regulations may be lax, and wavelength accuracy isn’t verified.”

Commercial Products and Research Limitations

Red and blue light sources, he notes, “aren’t typically employed clinically, but could assist with specific concerns.” Red wavelength therapy, proponents claim, improve circulatory function, oxygen uptake and dermal rejuvenation, and stimulate collagen production – a key aspiration in anti-ageing effects. “Research exists,” says Ho. “Although it’s not strong.” Regardless, with numerous products on the market, “it’s unclear if device outputs match study parameters. Optimal treatment times are unknown, ideal distance from skin surface, the risk-benefit ratio. Many uncertainties remain.”

Targeted Uses and Expert Opinions

One of the earliest blue-light products targeted Cutibacterium acnes, a microbe associated with acne. Scientific backing remains inadequate for regular prescription – despite the fact that, says Ho, “it’s commonly used in cosmetic clinics.” Certain patients incorporate it into their regimen, he says, however for consumer products, “we advise cautious experimentation and safety verification. Unless it’s a medical device, standards are somewhat unclear.”

Innovative Investigations and Molecular Effects

Simultaneously, in innovative scientific domains, Chazot has been experimenting with brain 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 states. The numerous reported benefits have generated doubt regarding phototherapy – that results appear unrealistic. Yet, experimental evidence has transformed his viewpoint.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, 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 recalls. “I was quite suspicious. It was an unusual wavelength of about 1070 nanometres, that nobody believed did anything biological.”

The advantage it possessed, however, was its efficient water penetration, enabling deeper tissue penetration.

Mitochondrial Impact and Cognitive Support

Growing data suggested infrared influenced energy-producing organelles. Mitochondria produce ATP for cell function, generating energy for them to function. “Every cell in your body has mitochondria, including the brain,” says Chazot, who prioritized neurological investigations. “Research confirms improved brain blood flow with phototherapy, which is consistently beneficial.”

With 1070 treatment, energy organelles generate minimal reactive oxygen compounds. In low doses this substance, explains the expert, “triggers guardian proteins that maintain organelle health, look after your cells and also deal with the unwanted proteins.”

All of these mechanisms appear promising for treating a brain disease: antioxidant, inflammation reduction, and pro-autophagy – autophagy representing cellular waste disposal.

Ongoing Study Progress and Specialist Evaluations

Upon examining current studies on light therapy for dementia, he reports, several hundred individuals participated in various investigations, including his own initial clinical trials in the US