Red Light Therapy (Photobiomodulation)
Exposure to red and near-infrared light has become a popular biohacking tool — with real, though still limited, evidence mainly in the context of skin health.
Number of studies
1
Safety
Moderate
Time to effects
Visible effects for skin usually appear after several to a dozen or so weeks of regular sessions.
Who it's for
Table of contents
TL;DR
Exposure to red and near-infrared light has become a popular biohacking tool — with real, though still limited, evidence mainly in the context of skin health.
- →May support wound healing and reduction of skin inflammation
- →Studied in the context of reducing fine wrinkles and improving skin elasticity
- →Doesn't carry the DNA-damage risk typical of UV radiation
| Type of intervention | Exposure to red and near-infrared light (photobiomodulation) |
|---|---|
| Level of evidence | Moderate — the strongest evidence is for skin health and wound healing |
| Target group | People interested in supporting skin health and appearance |
| Wavelength range | 630–850 nm (red and near-infrared light) |
| Status | Commercially available devices for home and professional use (spas, dermatology clinics) |
Understand
Overview
Red light therapy, also known as photobiomodulation or low-level laser therapy (LLLT), involves exposing skin or tissue to light in the red and near-infrared wavelength range (typically 630–850 nm), emitted by LEDs or low-power lasers. Unlike UV radiation, red light doesn't carry the DNA-damage risk typical of tanning, which makes it the subject of separate dermatological and regenerative research.
A review by Avci and colleagues, published in Seminars in Cutaneous Medicine and Surgery, summarizes the evidence for photobiomodulation in dermatology — the most solid data concerns wound healing, wrinkle reduction, and skin inflammation, while applications in other areas (muscle recovery, mood, sleep) still have a less consistent and smaller evidence base.
Who can genuinely benefit from this? People interested in supporting skin health and appearance, for whom the evidence is relatively the strongest among all applications of this therapy. It's worth approaching heavily marketed claims about fat burning or general 'cellular energy' with more skepticism, where human evidence is much more modest than device marketing suggests.
Mechanism of action
Photons of red and near-infrared light are absorbed by cytochrome c oxidase, an enzyme in the mitochondrial respiratory chain, which in laboratory studies increases ATP production and modulates the level of reactive oxygen species inside the cell. This increased cellular energy availability is the proposed mechanism behind the accelerated wound healing and reduced tissue inflammation observed in some studies of exposed tissue.
In the context of skin, photobiomodulation may additionally stimulate fibroblasts to increase collagen production, which explains its studied applications in reducing fine wrinkles and improving skin elasticity. It's worth stressing, though, that the effect depends strongly on exposure parameters — wavelength, intensity, duration, and tissue penetration depth — which makes it difficult to directly compare results across different studies and commercially available devices.
Absorption by cytochrome c oxidase
Photons are absorbed by an enzyme of the mitochondrial respiratory chain.
Increased ATP production
Absorbed light energy can increase cellular energy production in laboratory studies.
Fibroblast stimulation
In the context of skin, red light may stimulate collagen production by fibroblasts.
Evidence: moderate — based on 1 study in this database.
Benefits
Common myths
MythRed light therapy is just as well documented for fat burning as it is for skin health.
FactEvidence for dermatological applications (wound healing, wrinkles) is considerably more solid than for popular marketing claims about 'fat burning' or general metabolic improvement, where human data is modest.
MythEvery LED device marketed as 'red light therapy' works the same way.
FactEffectiveness depends strongly on the specific wavelength, intensity, and exposure time — the parameters used in clinical studies differ significantly from many cheaper, unspecified consumer devices.
Forms & variants
Red Light Therapy (Photobiomodulation) comes in several forms that differ in bioavailability and use case — the form you pick genuinely matters for how effective the supplementation is.
Body LED panels
Larger exposure area, used among other things in the context of muscle recovery.
Best for: Exposure of larger body areas
Face masks
Concentrated exposure of facial skin.
Best for: Dermatological applications, skin care
Practice
Frequently asked questions
With devices matching the specification and with eye protection maintained, it's generally considered safe, though people with skin lesions or who are pregnant should consult a doctor before starting.
In dermatological studies, visible effects usually appeared after several to a dozen or so weeks of regular sessions, several times a week.
No — these are separate interventions with different mechanisms of action; red light therapy doesn't protect skin against the harmful effects of UV radiation.
Dosage & timing
Typical dose
Sessions of 10–20 minutes, 3–5 times a week, depending on the device and goal
Form
LED panels, face masks, or spot-treatment devices
Effectiveness depends strongly on the specific device's parameters (wavelength, intensity) — it's worth choosing devices with clearly stated specifications matching the parameters used in studies.
Safety
Side effects & contraindications
Possible side effects
Rarely: transient skin redness
Risk of eye damage with direct, unprotected exposure to stronger laser devices
Contraindications
Active skin malignancies in the area of planned exposure — requires dermatological consultation
Pregnancy — limited safety data in this context
Interactions
Photosensitizing drugs can increase skin sensitivity to light exposure
Is it worth taking?
Who it's for
- People interested in supporting skin health and appearance
- People looking for non-invasive methods supporting tissue healing
Not for
- Active skin malignancies in the area of planned exposure — requires dermatological consultation
- Pregnancy — limited safety data in this context
Evidence
Worth knowing
Photobiomodulation is also called low-level laser therapy (LLLT), though LEDs are now more commonly used for this purpose than lasers.
Cytochrome c oxidase, the enzyme that absorbs red light in mitochondria, is a key part of the cell's respiratory chain.
Studies
Photobiomodulation shows documented applications in dermatology, including accelerating wound healing and reducing skin inflammation, though the effect depends significantly on exposure parameters.
Avci P, et al., Seminars in Cutaneous Medicine and Surgery, 2013
Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring
Moderate evidenceAvci P, Gupta A, Sadasivam M, et al. · Seminars in Cutaneous Medicine and Surgery · 2013
A review of photobiomodulation applications in dermatology, including wound healing, reduction of inflammation, and support of collagen production.
View studySources & bibliography
Citations are illustrative for this demo version and require full bibliographic verification by the editorial team before production publication.
Compare with similar entries
About the authors of this entry
Author
Michał NowakClinical Dietitian
Michał specializes in metabolic nutrition, intermittent fasting and sports supplementation.
61 publications on this site
Medical review
dr Anna KowalczykEditor-in-Chief, Molecular Biology
Anna oversees the editorial process and scientific review of every publication in the knowledge base. She previously researched autophagy and mitochondrial biology.
50 publications on this site
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Comments (2)
- KW
Kasia W. 2 weeks ago
Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.
- MT
Marek T. a month ago
Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.