‘It seems like sorcery’: is light therapy truly capable of improving your skin, whitening your teeth, and strengthening your joints?

Light-based treatment is definitely experiencing a wave of attention. There are now available illuminated devices designed to address complexion problems and aging signs as well as muscle pain and gum disease, the latest being an oral care tool enhanced with miniature red light sources, described by its makers as “a significant discovery in at-home oral care.” Internationally, 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, which use infrared light to warm the body directly, the thermal energy targets your tissues immediately. As claimed by enthusiasts, the experience resembles using an LED facial mask, boosting skin collagen, relaxing muscles, alleviating inflammatory responses and chronic health conditions while protecting against dementia.

The Science and Skepticism

“It sounds a bit like witchcraft,” notes a Durham University professor, professor in neuroscience at Durham University and a convert to the value of light therapy. Naturally, we know light influences biological functions. Sunlight helps us make vitamin D, essential for skeletal strength, immune function, and muscular health. Natural light synchronizes our biological clocks, 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. Clearly, light energy is essential for optimal functioning.

Various Phototherapy Approaches

Although mood lamps generally utilize blue-spectrum frequencies, most other light therapy devices deploy red or infrared light. In rigorous scientific studies, such as Chazot’s investigations into the effects of infrared on brain cells, identifying the optimal wavelength is crucial. Photons represent electromagnetic waves, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to short-wavelength gamma rays. Therapeutic light application employs mid-spectrum wavelengths, including invisible ultraviolet radiation, followed by visible light encompassing rainbow colors and finally infrared detectable with special equipment.

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 dampens down inflammation,” explains Dr Bernard Ho. “There’s lots of evidence for phototherapy.” 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.”

Safety Considerations and Medical Oversight

Potential UVB consequences, including sunburn or skin darkening, are understood but clinical devices employ restricted wavelength ranges – signifying focused frequency bands – that reduces potential hazards. “Therapy is overseen by qualified practitioners, thus exposure is controlled,” notes the specialist. Essentially, 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 oversight might be limited, and wavelength accuracy isn’t verified.”

Commercial Products and Research Limitations

Colored light diodes, he notes, “don’t have strong medical applications, but they may help with certain conditions.” Red wavelength therapy, proponents claim, help boost blood circulation, oxygen uptake and cell renewal in the skin, and promote collagen synthesis – an important goal for anti-aging. “The evidence is there,” says Ho. “Although it’s not strong.” 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. We don’t know the duration, how close the lights should be to the skin, whether or not that will increase the risk versus the benefit. There are lots of questions.”

Specific Applications and Professional Perspectives

Early blue-light applications focused on skin microbes, a microbe associated with acne. Research support isn’t sufficient for standard medical recommendation – despite the fact that, notes the dermatologist, “it’s often seen in medical spas or aesthetics practices.” Certain patients incorporate it into their regimen, he observes, though when purchasing home devices, “we recommend careful testing and security confirmation. Without proper medical classification, the regulation is a bit grey.”

Advanced Research and Cellular Mechanisms

Meanwhile, in innovative scientific domains, scientists have been studying cerebral tissue, revealing various pathways for light-enhanced cell function. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he states. The numerous reported benefits have generated doubt regarding phototherapy – that claims seem exaggerated. But his research has thoroughly changed his mind in that respect.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, though twenty years earlier, a physician creating light-based cold sore therapy requested his biological knowledge. “He developed equipment for cellular and insect experiments,” he explains. “I remained doubtful. This particular frequency was around 1070 nanometers, that many assumed was biologically inert.”

The advantage it possessed, however, was its ability to transmit through aqueous environments, allowing substantial bodily penetration.

Cellular Energy and Neurological Benefits

Growing data suggested infrared influenced energy-producing organelles. Mitochondria produce ATP for cell function, creating power for cellular operations. “Mitochondria exist throughout the body, even within brain tissue,” explains the neuroscientist, who prioritized neurological investigations. “It has been shown that in humans this light therapy increases blood flow into the brain, which is consistently beneficial.”

With specific frequency application, energy organelles generate minimal reactive oxygen compounds. In low doses this substance, notes the scientist, “activates protective proteins that safeguard mitochondria, protect cellular integrity and manage defective proteins.”

Such mechanisms indicate hope for cognitive disorders: oxidative protection, anti-inflammatory, and waste removal – autophagy being the process the cell uses to clear unwanted damaging proteins.

Present Investigation Status and Expert Assessments

When recently reviewing 1070nm research for cognitive decline, he states, several hundred individuals participated in various investigations, comprising his early research projects