Does Red Light Therapy for Muscle Recovery Work?
Maybe, a little. Research on red and near-infrared light therapy, also called photobiomodulation, is mixed. A 2024 meta-analysis of 34 trials found small benefits for endurance and strength recovery, mainly when the light was applied before exercise. An earlier review found little effect on soreness or strength. Most studies used clinical devices, not home panels.
So red light therapy isn't a scam, but it isn't a proven recovery shortcut either. Here's what the studies found, why they disagree, and how it compares with cheaper recovery options.
What Is Red Light Therapy?
It's shining red or near-infrared light, from lasers or LEDs, onto your skin over a muscle. The proposed idea is that the light affects energy production in your cells and may reduce damage and inflammation after exercise. In research, it's usually called photobiomodulation therapy, or PBMT, and it's applied for short sessions before or after training.
Clinical studies typically use specific wavelengths, doses and devices placed directly on the muscle. Home panels and wands vary a lot in power and wavelength, so results from lab studies don't automatically carry over to a device you buy online.
That's the first reason to be cautious: "red light therapy" covers a wide range of products, and only some resemble what was tested.
What Does Research Show About Red Light Therapy for Recovery?
It's mixed. The largest recent meta-analysis, covering 34 trials, found light therapy before exercise slightly improved muscle endurance and helped strength and a damage marker recover. But an earlier meta-analysis of 15 studies found no clear effect on soreness, strength or swelling, and only a drop in a damage marker with lasers used before exercise.
| Review | Studies | Main finding |
|---|---|---|
| 2016 meta-analysis | 15 studies, 317 people | Little effect on soreness, strength or range of motion; lower damage marker only with laser before exercise |
| 2024 meta-analysis | 34 trials | Small improvements in endurance and strength recovery, mainly applied before exercise |
| 2022 meta-analysis | 4 studies, 66 people | Better than cold therapy for strength and soreness, but low-certainty evidence |
The 2016 authors, writing in Lasers in Medical Science, concluded light therapy "may not have substantial effect" on exercise-induced muscle injury and pain, while noting small, varied studies limited firm conclusions.
Why Do the Studies on Red Light Therapy Disagree?
Mostly because they're small and different from each other. Trials used different devices, wavelengths, doses, muscles and types of exercise, which makes them hard to combine. Many had only a handful of participants. When the evidence is this varied, small positive results can easily appear or disappear from one review to the next.
The 2016 meta-analysis said its conclusions were limited by "substantial heterogeneity," the small number of studies in each analysis and small sample sizes. The 2022 review rated the certainty of its evidence as moderate to very low.
That doesn't mean the therapy doesn't work. It means the research can't yet say how well it works, for whom, or at what dose.
Does Red Light Therapy Work Better Before or After a Workout?
Before, based on the stronger evidence. The 2024 meta-analysis focused on light applied before exercise and found benefits there. In the 2016 review, the only clear effect also came from laser treatment before exercise. If you try it, using it before training seems to be the better-supported choice.
The 2024 meta-analysis also found something surprising: the benefits showed up in athletes and in physically inactive people, but not in people who were regularly active without being competitive athletes. Researchers don't know why, and it's a reminder that results can vary a lot between groups.
The 2022 review that compared light therapy after exercise with cold therapy found positive results, but it included just four small studies with 66 people in total.
Does Red Light Therapy Reduce Muscle Soreness?
The evidence is inconsistent. The 2016 meta-analysis found no clear reduction in pain, while the small 2022 review found less soreness compared with cold therapy. With results pointing both ways, red light therapy shouldn't be your first choice if soreness is the main problem.
A 2018 meta-analysis of 99 recovery studies in Frontiers in Physiology found massage was the most effective way to reduce soreness, with cold water immersion, compression and active recovery also helping. Those options are cheaper and better studied.
Our guide on whether you should work out while sore covers soreness in more detail, and is sauna for muscle recovery worth it looks at another heat-based option.
Is Red Light Therapy Worth It for Lifters?
For most lifters, it's a low priority. The benefits in research are small and inconsistent, devices can be expensive, and home products may not match what was tested. If you already sleep well, eat enough protein and train sensibly, red light therapy might add a little. If those basics aren't in place, it won't make up for them.
Here's how it stacks up against the recovery basics:
- Sleep: the foundation of recovery for everyone.
- Protein and food: our guide on protein shakes for muscle recovery shows what protein does and doesn't do.
- Sensible training volume: our guide on how many rest days a week you need helps you recover between sessions.
- Extras like massage, sauna or red light: small, optional add-ons.
If you enjoy a device and can afford it, try it with modest expectations: "possibly a small edge," not a breakthrough.
How Do You Use Red Light Therapy If You Want to Try It?
Follow the device's instructions, use it on the muscles you're about to train, and keep sessions short. Since the better evidence is for use before exercise, a session before your workout makes sense. Track how you feel and perform for a few weeks to see whether it seems worth continuing.
Protect your eyes as the device maker recommends, especially with bright panels. If you have a skin condition, are sensitive to light or take medication that increases light sensitivity, check with a doctor first.
Keep in mind that lab studies used carefully measured doses. A home device that's weaker or uses different wavelengths may do less, and there isn't good research comparing consumer panels with clinical equipment.
FAQ
How long does red light therapy take to work for muscles?
In studies, light was usually applied in a single session shortly before or after exercise, with effects measured over the following days. There's no established timeline for home use. Try it consistently for a few weeks and judge it by your own recovery and performance.
Is red light therapy better than ice baths?
One small review found light therapy did better than cold therapy for strength and soreness, but it included only four studies. Cold water immersion has its own evidence for short-term soreness relief. Neither is essential for most lifters.
Can red light therapy build muscle?
There's no good evidence it builds muscle on its own. Muscle growth comes from training, protein and recovery. At best, light therapy may slightly help you recover between sessions. Our guide on how long it takes to build muscle covers what drives growth.
Is red light therapy safe?
The studies here focused on performance and recovery, not the long-term safety of home devices. Follow the device instructions and protect your eyes. Check with a doctor if you have a skin condition, light sensitivity or take medication that makes your skin more sensitive to light.
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