How Red Light Therapy Works
Red light therapy is a wellness practice also known as photobiomodulation (PBM).
It uses specific wavelengths of red and near-infrared (NIR) light to support natural processes in the body—without heat, UV, or anything invasive.
What is PhotoBioModulation (PBM)?
PBM is the scientific term used in many studies and clinical settings to describe Red and Near-InfraRed light used for wellness and recovery routines. The idea is straightforward: cells absorb light and respond with normal biological signaling.
Different devices deliver different doses—so results depend on consistency, time, distance, and the type of device.
Red vs Near-Infrared (NIR):
Red Light (Visible)
Often used for skin-focused routines. Many people choose red light to support the look of radiance, tone, and texture over time.
Near-Infrared (NIR) (Invisible)
NIR light is invisible and often used for deeper comfort and recovery routines. Because you can’t see it, NIR is also popular for discreet evening use.
What happens in the body?
1) Absorb — tissue absorbs red/NIR light.
2) Signal — cells respond with normal signaling and regulation.
3) Support — over time, this can support routines people use for skin, comfort, and recovery.
(Keep it simple. PBM is about building a repeatable habit.)
Light energy is absorbed in layers—skin, tissue, muscle. With the right distance and routine, you can focus support on the area that needs it most.
Arjen Helder - Inventor of Red Light Devices
A quick history of red light therapy
Red light therapy has roots in research going back decades—first explored with low-level laser work, then expanded as LED technology improved. As LEDs became more efficient, PBM moved from labs and clinics into consumer devices like masks, pads, panels, and targeted lamps.
Today, the biggest difference between devices is not the buzzwords—it’s dose and usability.
The big secret: dose matters
With red light therapy, more is not always better. Too little may do nothing; too much can be counterproductive. The best results come from the right combination of:
distance + time + consistency, matched to the area you’re using it on.
What kinds of red light devices exist?
What should you expect?
Red light therapy isn’t a one-time “treatment” — it’s more like skincare or stretching. The sessions feel gentle and easy to fit into daily life, and the real value comes from repeating the routine consistently.
Some people notice an immediate “fresh” feeling after a session — a calmer body, a warmer sense of comfort, or a brighter look to the skin. But most outcomes people care about are gradual and cumulative. Think in weeks, not days: early changes often show up first, and deeper changes typically build with steady use.
The best way to approach it is simple: pick one routine (Beauty, Recovery, or Sleep), follow the distance and time guidance, and stick with it long enough to let your body respond. Consistency matters. Results vary.
A widely cited review that explains how red and near-infrared light may influence inflammation-related pathways and summarizes applications studied across tissues and conditions. Often used by RLT brands as a “big picture” science foundation.
https://pubmed.ncbi.nlm.nih.gov/28748217/
A concise overview from one of the most referenced authors in the field, framing PBM/LLLT and why it matters. Brands cite it to introduce the term “photobiomodulation” and point readers toward the broader evidence base.
https://pubmed.ncbi.nlm.nih.gov/27973730/
A cornerstone mechanisms paper summarizing leading hypotheses (photoacceptors, mitochondria/cytochrome c oxidase, signaling cascades) and why dose and parameters matter. Commonly referenced when brands explain “how light affects cells.”
https://pubmed.ncbi.nlm.nih.gov/28070154/
The classic “dose matters” review describing the biphasic (Arndt–Schulz) response—why too little may do nothing and too much may reduce benefit. Brands cite this to justify careful session design (time, distance, power).
https://pubmed.ncbi.nlm.nih.gov/20011653/
A major dermatology-focused review covering how PBM has been studied for skin appearance, healing, and related mechanisms. Often referenced by beauty-oriented brands to explain why red/NIR is used in skincare routines.
https://pubmed.ncbi.nlm.nih.gov/24049929/
A well-known early LED paper associated with NASA-related research, commonly cited as part of the modern LED therapy origin story. Brands use it to show LEDs (not just lasers) have been studied in healing contexts.
https://pubmed.ncbi.nlm.nih.gov/11776448/
A clinical split-face trial evaluating LED phototherapy for facial wrinkles, including clinical and tissue-level observations. Commonly cited by “skin rejuvenation” messaging to point to human trial designs.
https://pubmed.ncbi.nlm.nih.gov/17566756/
A frequently cited mechanistic study linking PBM effects to cytochrome c oxidase and cellular energy metabolism in neurons. Brands reference it when explaining mitochondria as a key light target.
https://pubmed.ncbi.nlm.nih.gov/15557336/
A critical review emphasizing cytochrome c oxidase as a major photoacceptor in the red-to-near-infrared range and discussing downstream signaling. Often used in “why these wavelengths” explanations.
https://pubmed.ncbi.nlm.nih.gov/20681024/
