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Light-based treatment is definitely experiencing a surge in popularity. You can now buy light-emitting tools designed to address complexion problems and aging signs to muscle pain and oral inflammation, the latest being a toothbrush equipped with small red light diodes, promoted by the creators as “a breakthrough for domestic dental hygiene.” Internationally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion 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. According to its devotees, it feels similar to a full-body light therapy session, enhancing collagen production, easing muscle tension, reducing swelling and persistent medical issues as well as supporting brain health.

The Science and Skepticism

“It appears somewhat mystical,” says a Durham University professor, professor in neuroscience at Durham University and a convert to the value of light therapy. Of course, some of light’s effects on our bodies are well established. Sunlight helps us make vitamin D, needed for bone health, immunity, muscles and more. Natural light synchronizes our biological clocks, additionally, stimulating neurotransmitter and hormone production during daytime, and winding down bodily functions for sleep as it fades into night. Artificial sun lamps are a common remedy for people with seasonal affective disorder (Sad) to elevate spirits during colder months. Undoubtedly, light plays a vital role in human health.

Types of Light Therapy

Although mood lamps generally utilize blue-spectrum frequencies, the majority of phototherapy tools use red or near-infrared wavelengths. In serious clinical research, such as Chazot’s investigations into the effects of infrared on brain cells, determining the precise frequency is essential. Photons represent electromagnetic waves, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to short-wavelength gamma rays. Light-based treatment utilizes intermediate light frequencies, including invisible ultraviolet radiation, then the visible spectrum we perceive as colors and infrared light visible through night vision technology.

UV light has been used by medical dermatologists for many years to manage persistent skin disorders including eczema and psoriasis. It modulates intracellular immune mechanisms, “and dampens down inflammation,” says Dr Bernard Ho. “Substantial research supports light therapy.” UVA penetrates skin more deeply than UVB, whereas the LEDs we see on consumer light-therapy devices (typically emitting red, infrared or blue wavelengths) “tend to be a bit more superficial.”

Risk Assessment and Professional Supervision

UVB radiation effects, like erythema or pigmentation, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – which decreases danger. “It’s supervised by a healthcare professional, so the dosage is monitored,” explains the dermatologist. Most importantly, the light sources are adjusted by technical experts, “to confirm suitable light frequency output – as opposed to commercial tanning facilities, where it’s a bit unregulated, and emission spectra aren’t confirmed.”

Consumer Devices and Evidence Gaps

Red and blue light sources, he notes, “don’t have strong medical applications, but could assist with specific concerns.” Red wavelength therapy, proponents claim, improve circulatory function, oxygen uptake and skin cell regeneration, and stimulate collagen production – a primary objective in youth preservation. “Studies are available,” states the dermatologist. “But it’s not conclusive.” Nevertheless, 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. Appropriate exposure periods aren’t established, proper positioning requirements, the risk-benefit ratio. There are lots of questions.”

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 frequently employed in beauty centers.” Individuals include it in their skincare practices, he says, but if they’re buying a device for home use, “we just tell them to try it carefully and to make sure it has been assessed for safety. Unless it’s a medical device, oversight remains ambiguous.”

Innovative Investigations and Molecular Effects

Meanwhile, in advanced research areas, 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 states. The numerous reported benefits have generated doubt regarding phototherapy – that claims seem exaggerated. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, though twenty years earlier, a doctor developing photonic antiviral treatment consulted his scientific background. “He developed equipment for cellular and insect experiments,” he recalls. “I was quite suspicious. It was an unusual wavelength of about 1070 nanometres, that nobody believed did anything biological.”

What it did have going for it, nevertheless, was that it travelled through water easily, enabling deeper tissue penetration.

Mitochondrial Impact and Cognitive Support

Additional research indicated infrared affected cellular mitochondria. Mitochondria produce ATP for cell function, generating energy for them to function. “All human cells contain mitochondria, including the brain,” notes the researcher, who prioritized neurological investigations. “Studies demonstrate enhanced cerebral circulation with light treatment, which is generally advantageous.”

Using 1070nm wavelength, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In limited quantities these molecules, says Chazot, “stimulates so-called chaperone proteins which look after your mitochondria, look after your cells and also deal with the unwanted proteins.”

All of these mechanisms appear promising for treating a brain disease: free radical neutralization, swelling control, and waste removal – autophagy being the process the cell uses to clear unwanted damaging proteins.

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, comprising his early research projects