THE CURE INDEX
Helio Cure's evidence score based on human clinical trials for red light therapy.
Restless legs syndrome, also known as RLS or Willis-Ekbom Disease, creates an urge to move the legs along with uncomfortable sensations, most often at rest.
5 human studies, with 141 participants between them, found red light therapy effective for restless legs syndrome. The CURE Index gives this condition 91 out of 100, indicating strong confidence.
Red light therapy was associated with milder symptoms, including in people receiving kidney dialysis.
3 randomized controlled trials, 1 clinical trial, and 1 observational study make up the 5 studies. Every one reported an effective outcome.
890 nm was the wavelength tied to the strongest results, drawn from a range of 650 to 1400 nm. Treatment ran for 3 to 12 sessions across 28 to 30 days, with each lasting from 58 seconds to 30 minutes.
EVIDENCE AT A GLANCE
The numbers behind the verdict.
MOST CITED WAVELENGTH
The wavelength appearing most often in studies that showed benefit for restless legs syndrome.
890 nmTREATMENT PROTOCOL RANGES
The lowest and highest values used across restless legs syndrome studies.
| PARAMETER | RANGE |
|---|---|
| Wavelength | 650-1400 nm |
| Session Duration | 58 seconds-30 minutes |
| Session Frequency | 3-12 per week |
| Therapy Duration | 28-30 days |
Note: We have excluded meta-analyses and reviews from scoring, but the list of human studies below contains them for your reference.
6 Human Studies on Red Light Therapy for Restless Legs Syndrome
Dialysis Patients Reported Less Severe RLS After Near-Infrared Light
Among 60 people receiving kidney dialysis who also had restless legs syndrome (RLS), a 2018 single-blind randomized controlled trial in Iran tested near-infrared light applied to treatment points on the legs and feet. 30 participants received 12 sessions of 940 nm light at 21 and 210 mW, 35 mW/cm², and 130 Hz, given for 2 minutes during dialysis 3 times a week across 30 days, while the other 30 received sham treatment. Symptom scores differed between the 2 groups by the end of the sessions in a way the researchers judged to matter both statistically and in practice. The trial concluded that light applied to these points was an effective way of easing RLS symptoms in people receiving dialysis.
- Study Type
- Randomized Controlled Trial
- Participants
- 60
- Treated Area
- Legs And Feet
- Wavelength(s)
- 940 nm
- Session Duration
- 2 minutes
- Session Frequency
- 12 per week
- Therapy Duration
- 30 days
Study Title: Effect of Near-Infrared Light Therapy Based on Acupoints on the Severity of Restless Legs Syndrome in Patients Undergoing Hemodialysis: A Single-Blind, Randomized Controlled Trial.
Symptom Scores Improved in Restless Legs Syndrome After Near-Infrared Light
A single-group design gave every participant the active treatment in a 2016 clinical trial of near-infrared light for restless legs syndrome at a university in Arkansas, United States. 21 people received 850 nm light at 8 J/cm² delivered through the skin to 4 places on each leg and to the soles of both feet, for 58 seconds per session, 3 times a week across 28 days. The trial found that average symptom scores on a standard 0 to 40 rating scale dropped from 26.5 before treatment to 16.1 afterward, a change large enough to matter both statistically and in practice. Light-touch sensation and a measure comparing blood pressure at the ankle with blood pressure at the arm also improved, while pain ratings and ultrasound scans of the leg arteries stayed the same.
- Study Type
- Clinical Trial
- Participants
- 21
- Treated Area
- Legs And Feet
- Wavelength(s)
- 850 nm
- Session Duration
- 58 seconds
- Session Frequency
- 12 per week
- Therapy Duration
- 28 days
Study Title: Using near infrared light to manage symptoms associated with restless legs syndrome.
Near-Infrared Light Outperformed Sham for Restless Legs Syndrome Symptoms
34 volunteers with restless legs syndrome took part in a 2011 randomized controlled trial of near-infrared light at a university in Utah, United States. Participants were assigned either to 12 treatments of 890 nm light at 62.4 J/cm² and 292 Hz, applied in contact to the lower legs for 30 minutes per session 3 times a week across 28 days, or to 12 sham sessions in which no light was delivered. The treated group appeared to improve more than the sham group after 4 weeks, and was still an average of 8.5 points below its starting score 4 weeks after treatment ended. Symptom scores in the sham group also fell by an average of 4.4 points, which the trial attributed to a placebo response.
- Study Type
- Randomized Controlled Trial
- Participants
- 34
- Treated Area
- Leg
- Wavelength(s)
- 890 nm
- Distance
- Contact
- Session Duration
- 30 minutes
- Session Frequency
- 12 per week
- Therapy Duration
- 28 days
Study Title: Restless legs syndrome and near-infrared light: An alternative treatment option.
Wavelength Did Not Change How Well Near-Infrared Light Eased RLS
Comparing 2 near-infrared light devices against each other, a 2011 randomized controlled trial examined whether different wavelengths and pulse frequencies changed how well treatment worked for restless legs syndrome (RLS). 25 volunteers were randomly assigned to 1 of the 2 devices, which between them delivered 650, 880 and 890 nm light in contact with the lower legs at powers from 13 mW to 6 W and pulse frequencies of 292, 297 and 4698 Hz, in 30-minute sessions given 3 times a week across 28 days, with 1 device also emitting red light. The trial found no meaningful difference between the 2 devices either at the start or after 4 weeks. Symptom scores in both groups dropped by an average of 11 points on a standard 0 to 40 rating scale over the 4 weeks.
- Study Type
- Randomized Controlled Trial
- Participants
- 25
- Treated Area
- Legs
- Wavelength(s)
- 650, 880, 890 nm
- Distance
- Contact
- Session Duration
- 30 minutes
- Session Frequency
- 12 per week
- Therapy Duration
- 28 days
Study Title: Comparison of two infrared devices in their effectiveness in reducing symptoms associated with RLS.
Severe Restless Legs Syndrome Eased With Near-Infrared Light
Symptom scores on a standard 0 to 40 restless legs rating scale dropped from 27 before treatment to 0 by week 4 in a 2010 observational study of near-infrared light for restless legs syndrome (RLS). The report followed a 69-year-old woman who had lived with RLS for more than 30 years and had tried many medications without success, treating her legs with 880 to 890 nm light at 600 mW/cm² and 292 Hz for 30 minutes per session, 3 times a week across 28 days. She was almost symptom-free by week 2, scoring 2, and fully symptom-free by week 4. Symptoms returned slowly during the third week after treatment ended, so the benefit appeared to fade once treatment stopped.
- Study Type
- Observational Study
- Participants
- 1
- Treated Area
- Legs
- Wavelength(s)
- 880-890 nm
- Session Duration
- 30 minutes
- Session Frequency
- 12 per week
- Therapy Duration
- 28 days
Study Title: Use of near-infrared light to reduce symptoms associated with restless legs syndrome in a woman: a case report.
Review Linked Non-Drug Options Including Light to Milder Restless Legs Syndrome
In 2011, a review examined non-drug treatments for Ekbom disease, the condition formerly known as restless legs syndrome. Drawing on 257 participants across the studies covered, the review looked at lifestyle changes, physical activity, inflatable sleeves that squeeze the legs, massage, near-infrared light therapy at 780 to 1400 nm given 3 times a week, and complementary therapies. According to the review, a growing body of evidence supported these non-drug options, with the proposed mechanisms including greater blood flow to the legs and greater availability of the chemicals nerves use to signal. The review described these options as carrying fewer or no side effects and costing less than medication.
- Study Type
- Review
- Participants
- 257
- Treated Area
- Leg
- Wavelength(s)
- 780-1400 nm
- Session Frequency
- 3 per week
Study Title: Nondrug-related aspect of treating Ekbom disease, formerly known as restless legs syndrome.
The CURE Index (Clinical Understanding of Red-light Evidence) by Helio Cure is a 0-100 evidence score based on published human clinical trials. Higher scores mean stronger evidence. Read full methodology →
Data is powered by AI and reviewed by the Helio Cure team.
This page is for educational purposes only. Not medical advice. Consult a healthcare provider before starting red light therapy. Helio Cure does not diagnose, treat, or cure any medical condition.
Last updated: Oct 05, 2026