Photobiomodulation: a brief history
It all started in 1967 in Budapest. Researcher Endre Mester noticed that mice exposed to red light regrew their fur faster and healed better than the control group. He had accidentally discovered what would later be called photobiomodulation (PBM).
Since then, over 6,000 clinical studies have documented the effects of red and infrared light on living cells. NASA adopted it to help astronauts maintain muscle mass in space.
The cellular mechanism
Inside each cell are mitochondria — the cellular "power plants." They contain an enzyme called cytochrome c oxidase, the primary photoacceptor for red and infrared light. It absorbs photons and uses them to produce more ATP.
In simple terms: red light "recharges" mitochondria like a solar panel charges a battery. Better-fuelled cells produce more collagen, repair damage faster, and defend better against oxidative stress.
Why 630 nm and 850 nm specifically?
- 630–660 nm (visible red): Penetrates 1–2 mm into skin. Targets collagen production, reduces inflammation, improves radiance and texture.
- 830–850 nm (near-infrared): Invisible to the eye. Penetrates 3–5 mm deeper, reaching the deep dermis and even muscles. Stimulates tissue repair, improves firmness.
What the clinical studies say
- A 2014 study (Journal of Photochemistry and Photobiology) showed a 31% increase in collagen density and 16% increase in elastin after 30 sessions at 630 nm.
- A 2019 meta-analysis of 52 clinical trials concluded significant efficacy of PBM for reducing fine lines (p<0.001).
- A 2021 study showed that the combination of 630 + 850 nm produced superior effects to either wavelength used alone (synergistic effect).
The research-recommended doses range from 3–50 J/cm², with an optimum around 10–20 J/cm² for skin — precisely the range delivered by Elyra devices in a 15–20 minute session.
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