The science · 9 min read
The Science of Red Light and Collagen: A Deep Dive
Cytochrome c oxidase, ATP, nitric oxide, and you.
January 14, 2025 · The Radia Atelier
If you want the mechanism in detail — not the marketing version — this is the one to read.
The chromophore: cytochrome c oxidase
Inside every cell sits the mitochondrion, and inside every mitochondrion sits a series of protein complexes that move electrons to produce ATP. Complex IV — cytochrome c oxidase — has an absorption peak around 600–900 nm. When red and near-infrared light hit, the enzyme dissociates inhibitory nitric oxide, electron flow accelerates, and ATP output climbs.
Downstream: fibroblasts get to work
Fibroblasts in the dermis are responsible for collagen and elastin production. With more available ATP and modulated reactive oxygen species, transcription of type I and type III collagen genes upregulates. Studies show measurable increases in dermal density within 8–12 weeks.
Why 633 nm and 830 nm specifically
These wavelengths sit in the "optical window" where light penetrates skin most efficiently. Shorter wavelengths scatter near the surface; longer wavelengths heat water without reaching cells. 633 nm and 830 nm reach the fibroblasts you actually want to talk to.
From the atelier
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