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Light-based treatment is certainly having a surge in popularity. There are now available light-emitting tools for everything from skin conditions and wrinkles to aching tissues and gum disease, recently introduced is a toothbrush equipped with small red light diodes, promoted by the creators as “a major advance in at-home oral care.” Globally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. Options include full-body infrared sauna sessions, where instead of hot coals (real or electric) heating the air, your body is warmed directly by infrared light. Based on supporter testimonials, it feels similar to a full-body light therapy session, boosting skin collagen, soothing sore muscles, alleviating inflammatory responses and long-term ailments while protecting against dementia.

Research and Reservations

“It feels almost magical,” observes Paul Chazot, a scientist who has studied phototherapy extensively. Certainly, we know light influences biological functions. Sunlight enables vitamin D production, crucial for strong bones, immune defense, and tissue repair. Sunlight regulates our circadian rhythms, additionally, stimulating neurotransmitter and hormone production during daytime, and signaling the body to slow down for nighttime. Daylight-simulating devices 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

Whereas seasonal affective disorder devices typically employ blue-range light, 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. 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 the visible spectrum we perceive as colors and infrared light visible through night vision technology.

Dermatologists have utilized UV therapy for extensive periods to manage persistent skin disorders including eczema and psoriasis. It affects cellular immune responses, “and dampens down inflammation,” explains 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 (usually producing colored light emissions) “tend to be a bit more superficial.”

Risk Assessment and Professional Supervision

UVB radiation effects, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – indicating limited wavelength spectrum – which minimises the risks. “Treatment is monitored by medical staff, so the dosage is monitored,” explains the dermatologist. Essentially, the light sources are adjusted by technical experts, “to confirm suitable light frequency output – different from beauty salons, where oversight might be limited, and we don’t really know what wavelengths are being used.”

Home Devices and Scientific Uncertainty

Colored light diodes, he notes, “aren’t typically employed clinically, though they might benefit some issues.” Red LEDs, it is proposed, enhance blood flow, oxygen uptake and dermal rejuvenation, and activate collagen formation – an important goal for anti-aging. “Studies are available,” comments the expert. “But it’s not conclusive.” Nevertheless, amid the sea of devices now available, “we’re uncertain whether commercial devices replicate research conditions. Optimal treatment times are unknown, ideal distance from skin surface, if benefits outweigh potential risks. There are lots of questions.”

Targeted Uses and Expert Opinions

One of the earliest blue-light products targeted Cutibacterium acnes, microorganisms connected to breakouts. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – although, notes the dermatologist, “it’s frequently employed in beauty centers.” Certain patients incorporate it into their regimen, 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. If it’s not medically certified, oversight remains ambiguous.”

Cutting-Edge Studies and Biological Processes

Meanwhile, in advanced research areas, Chazot has been experimenting with brain cells, discovering multiple mechanisms for infrared’s cellular benefits. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he reports. The numerous reported benefits have generated doubt regarding phototherapy – that claims seem exaggerated. Yet, experimental evidence has transformed his viewpoint.

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 designed tools for biological testing,” he says. “I remained doubtful. The specific wavelength measured approximately 1070nm, that nobody believed did anything biological.”

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

Mitochondrial Effects and Brain Health

Growing data suggested infrared influenced energy-producing organelles. Mitochondria are the powerhouses of cells, generating energy for them to function. “All human cells contain mitochondria, even within brain tissue,” says Chazot, who, as a neuroscientist, decided to focus the research on brain cells. “Research confirms improved brain blood flow with phototherapy, which is generally advantageous.”

With 1070 treatment, cellular power plants create limited oxidative molecules. In limited quantities these molecules, explains the expert, “triggers guardian proteins that maintain organelle health, look after your cells and also deal with the unwanted proteins.”

These processes show potential for neurological conditions: oxidative protection, anti-inflammatory, and pro-autophagy – autophagy representing cellular waste disposal.

Ongoing Study Progress and Specialist Evaluations

When recently reviewing 1070nm research for cognitive decline, he states, about 400 people were taking part in four studies, comprising his early research projects