Red light therapy guide
How Often Should You Use Red Light Therapy?
No study has established an ideal frequency for home red light panels. Trials commonly treated at least two to three times a week for several weeks. One skin trial used two sessions a week for 30 sessions, and a review of home devices included studies with use at least three times a week.1, 2 More isn't automatically better, because dose follows a biphasic curve in lab studies.3
Published September 19, 2026. 4 min read. Written by the Home Recovery Rooms editorial team.
Key takeaways
- A 136-person skin trial used twice-weekly sessions for 30 sessions, about 15 weeks, before measuring collagen density and roughness.1
- A review of home-use devices included studies where people used the device at least three times a week. Results were mostly positive but not conclusive.2
- Laboratory work shows low doses can stimulate and high doses can inhibit, so doubling your time isn't a safe assumption.3
- Your panel's irradiance at your distance decides how long a session should be, and manufacturers don't always publish it.4
How often should you use red light therapy?
Nobody has tested frequency for home panels in a way that yields one number. What exists are trial protocols, which vary because devices, conditions, and doses vary, and reviewers regularly note the lack of standardized parameters.5
| Study or setting | Schedule | What was measured |
|---|---|---|
| Skin rejuvenation trial, 136 volunteers1 | Twice a week, 30 sessions | Complexion, roughness, and collagen density improved versus controls |
| Home-use PBM devices, systematic review2 | At least three times a week, self-applied | Mostly positive, with more randomized trials needed |
| Muscle performance trials, 39 studies5 | Applied at varying points in an exercise protocol | Some improvement in endurance and strength measures |
| Knee osteoarthritis trials, 22 studies6 | A course of sessions with a defined dose per spot | Pain reduction at recommended doses |
Swipe sideways to see all columns.
Is daily red light therapy better?
There's no good evidence that it is. Laboratory reviews describe a biphasic dose response, with stimulation at low light levels and inhibition at high ones.3, 7 That finding comes from cells and animals, and how it scales to a person in front of a panel is unclear. It's a reason not to assume that more time or more sessions speed results.
How long should each session be?
It depends on the dose your panel delivers at your distance. Dose in joules per square centimeter equals irradiance in mW/cm² times seconds, divided by 1,000. The skin trial normalized treatments to about 9 J/cm² in the 611 to 650 nm range, with irradiance and treatment time differing by group.1 Knee osteoarthritis reviews specify doses per treatment spot, such as 4 to 8 J at 785 to 860 nm.6 If the manufacturer publishes irradiance at a stated distance, you can calculate a session length. If it doesn't, you're guessing, and a 2026 study found discrepancies between the output of promoted at-home devices and the specifications in the research cited to sell them.4
When should you expect results?
Slowly. The skin trial measured results after 30 sessions, about 15 weeks at twice weekly.1 In knee osteoarthritis trials at recommended doses, pain reduction peaked 2 to 4 weeks after treatment ended.6 Anyone promising results in a few days is going beyond the evidence. Our guide to what red light therapy can and can't do covers the rest.
Frequently asked questions
Can I use red light therapy every day?
Some home-use studies had people apply devices at least three times a week, but we found no evidence that daily use beats fewer sessions.2 Follow the manufacturer's limits.
Is 10 minutes enough?
It depends on irradiance and distance. Ten minutes at low output can deliver less than a clinical dose, and at high output it can deliver more.3
Should I use it before or after a workout?
Trials applied light at different points in the exercise protocol, and reviewers called for better trials to set optimal parameters. We found no clear answer on timing.5
Related guides
Sources
Linked to the original paper or publisher page wherever one is available. The label shows the study design.
- 1.Wunsch A, Matuschka K (2014). A controlled trial to determine the efficacy of red and near-infrared light treatment in patient satisfaction, reduction of fine lines, wrinkles, skin roughness, and intradermal collagen density increase. Photomedicine and Laser Surgery. Randomized trial
- 2.Gavish L, Houreld NN (2019). Therapeutic efficacy of home-use photobiomodulation devices: a systematic literature review. Photobiomodulation, Photomedicine, and Laser Surgery. Systematic review
- 3.Huang YY, Sharma SK, Carroll J, Hamblin MR (2011). Biphasic dose response in low level light therapy: an update. Dose-Response. Narrative review
- 4.Merkle T, Tomczak L, Do K, Aji M, Ilyas E (2026). At-home red light therapy devices: promotion and recommendation patterns on social media in the context of limited evidence. Cureus. Primary study
- 5.Vanin AA, Verhagen E, Barboza SD, Costa LOP, Leal-Junior ECP (2018). Photobiomodulation therapy for the improvement of muscular performance and reduction of muscular fatigue associated with exercise in healthy people: a systematic review and meta-analysis. Lasers in Medical Science. Meta-analysis
- 6.Stausholm MB, Naterstad IF, Joensen J, Lopes-Martins RÁB, Sæbø H, Lund H, et al. (2019). Efficacy of low-level laser therapy on pain and disability in knee osteoarthritis: systematic review and meta-analysis of randomised placebo-controlled trials. BMJ Open. Meta-analysis
- 7.Hamblin MR (2017). Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophysics. Narrative review
- 8.Jagdeo J, Austin E, Mamalis A, Wong C, Ho D, Siegel DM (2018). Light-emitting diodes in dermatology: a systematic review of randomized controlled trials. Lasers in Surgery and Medicine. Systematic review