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Light-based treatment is clearly enjoying a surge in popularity. Consumers can purchase glowing gadgets designed to address dermatological concerns and fine lines as well as muscle pain and gum disease, recently introduced is an oral care tool enhanced with tiny red LEDs, marketed by the company as “a significant discovery in personal mouth health.” Worldwide, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. Options include full-body infrared sauna sessions, which use infrared light to warm the body directly, the thermal energy targets your tissues immediately. According to its devotees, the experience resembles using an LED facial mask, enhancing collagen production, easing muscle tension, alleviating inflammatory responses and long-term ailments while protecting against dementia.

Understanding the Evidence

“It sounds a bit like witchcraft,” says a neuroscience expert, a scientist who has studied phototherapy extensively. Certainly, certain impacts of light on human physiology are proven. Our bodies produce vitamin D through sun exposure, essential for skeletal strength, immune function, and muscular health. Natural light synchronizes our biological clocks, too, triggering the release of neurochemicals and hormones while we are awake, and preparing the body for rest as darkness falls. Sunlight-imitating lamps are a common remedy for people with seasonal affective disorder (Sad) to boost low mood in winter. So there’s no doubt we need light energy to function well.

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. During advanced medical investigations, 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 high-energy gamma radiation. Light-based treatment uses wavelengths around the middle of this spectrum, the highest energy of those being invisible ultraviolet, then visible light (all the colours we see in a rainbow) and infrared light visible through night vision technology.

Ultraviolet treatment has been employed by skin specialists for decades to manage persistent skin disorders including eczema and psoriasis. It affects cellular immune responses, “and reduces inflammatory processes,” notes a dermatology expert. “Considerable data validates phototherapy.” UVA reaches deeper skin layers compared to UVB, while the LEDs in consumer devices (typically emitting red, infrared or blue wavelengths) “typically have shallower penetration.”

Safety Considerations and Medical Oversight

The side-effects of UVB exposure, like erythema or pigmentation, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – which minimises the risks. “Therapy is overseen by qualified practitioners, so the dosage is monitored,” explains the dermatologist. Essentially, the lightbulbs are calibrated by medical technicians, “to guarantee appropriate wavelength emission – unlike in tanning salons, where regulations may be lax, and wavelength accuracy isn’t verified.”

Consumer Devices and Evidence Gaps

Red and blue light sources, he says, “aren’t typically employed clinically, but they may help with certain conditions.” Red light devices, some suggest, improve circulatory function, oxygen uptake and dermal rejuvenation, and stimulate collagen production – a key aspiration in anti-ageing effects. “Research exists,” states the dermatologist. “But it’s not conclusive.” In any case, given the plethora of available tools, “it’s unclear if device outputs match study parameters. Optimal treatment times are unknown, how close the lights should be to the skin, whether or not that will increase the risk versus the benefit. Many uncertainties remain.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, microorganisms connected to breakouts. Research support isn’t sufficient for standard medical recommendation – despite the fact that, says Ho, “it’s often seen in medical spas or aesthetics practices.” Some of his patients use it as part of their routine, he says, but if they’re buying a device for home use, “we advise cautious experimentation and safety verification. Without proper medical classification, standards are somewhat unclear.”

Innovative Investigations and Molecular Effects

Meanwhile, in a far-flung field of pioneering medical science, scientists have been studying cerebral tissue, identifying a number of ways in which infrared can boost cellular health. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he reports. The numerous reported benefits have generated doubt regarding phototherapy – that results appear unrealistic. But his research has thoroughly changed his mind in that respect.

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 created some devices so that we could work with them with cells and with fruit flies,” he explains. “I was pretty sceptical. It was an unusual wavelength of about 1070 nanometres, that many assumed was biologically inert.”

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

Mitochondrial Effects and Brain Health

Additional research indicated infrared affected cellular mitochondria. Mitochondria are the powerhouses of cells, producing fuel for biological processes. “Every cell in your body has mitochondria, even within brain tissue,” says Chazot, who concentrated on cerebral applications. “It has been shown that in humans this light therapy increases blood flow into the brain, which is always very good.”

With 1070 treatment, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In low doses this substance, says Chazot, “triggers guardian proteins that maintain organelle health, protect cellular integrity and manage defective proteins.”

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

Current Research Status and Professional Opinions

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he reports, several hundred individuals participated in various investigations, comprising his early research projects