Red light masks, panels and caps are everywhere. Influencers glow red on social media, promising smoother skin, thicker hair and less pain.
So does red light therapy work? The honest answer from the research: for some uses, a little.
For most, we don’t really know yet.
The strongest evidence is for hair loss. The weakest is for many of the things it’s most heavily marketed for.
- In trials of home devices for hair loss, red light was linked to more hair growth than sham devices.
- For knee pain, reviews find some relief, but the evidence is rated low or very low certainty.
- Dermatologists say FDA clearance shows a device is considered safe, not that it works.
Does red light therapy work?
It may help some types of hair loss, and possibly some kinds of pain and slow-healing wounds. For wrinkles, the evidence is thin.
Red light therapy, also called photobiomodulation or low-level light therapy, shines red or near-infrared light on the skin.
Cleveland Clinic says plainly: “At this point in time, there’s not enough evidence to support most uses.”
The American Academy of Dermatology is more upbeat about hair. But it warns that “it’s difficult to know how effective at-home devices are”.
One thing that confuses the picture is that “red light therapy” covers very different devices. Trials have tested red LEDs, red lasers and invisible near-infrared lasers, often in clinics.
What the research shows
Home devices: the big review
A 2022 systematic review in Archives of Dermatological Research looked at home devices used for skin and hair. It included 37 clinical trials, 19 of them randomised.
It recommended home laser diodes for a common type of hair loss, and LEDs for acne. Notably, it did not recommend LEDs for wrinkles.
The authors pointed to “a limited number of randomized controlled trials” and a lack of long-term data. They declared no conflicts of interest.
Hair loss: the strongest case
A 2021 meta-analysis pooled seven double-blind trials of FDA-cleared home devices for pattern hair loss, with 607 participants.
Compared with sham devices, the real devices improved hair density, with a large standardised effect. That held in both men and women.
| Device type | Effect on hair density vs sham |
|---|---|
| All devices | Large improvement |
| Comb-style devices | Larger improvement |
| Helmet-style devices | Moderate improvement |
| Men and women | Similar benefit |
The trials lasted 16 to 26 weeks, and most people had mild to moderate hair loss. None ran longer than 26 weeks.
The AAD says red light has led to “some hair regrowth” in large trials. “However, it won’t regrow a full head of hair.”
Red light has its best evidence for mild to moderate hair loss, from home devices tested against sham. For wrinkles and many other claims, the evidence is weak or missing.
Skin and wrinkles: thin evidence
I couldn’t find an open-access meta-analysis of red light for wrinkles. The evidence comes from small, single trials.
A 2025 trial of a 660 nm red LED mask in 95 women found no difference between groups on a standard wrinkle scale. Some individual wrinkles measured shorter, and many women were satisfied.
A 2024 trial of a home LED neck device in 70 people reported that 77.1% improved, against 8.6% with a dummy device. But average wrinkle scores weren’t significantly different at 12 weeks.
That neck trial was funded by the device’s maker. The two groups also didn’t start out with the same wrinkle scores.
Pain: modest relief, low certainty
Much of the pain evidence comes from near-infrared lasers used in clinics, not red LED panels.
A 2024 network meta-analysis of 13 trials, with 673 people with knee osteoarthritis, found light therapy reduced pain compared with sham. It didn’t improve function or stiffness.
The authors rated the quality of evidence as low to very low. After they removed four trials at high risk of bias, one of the wavelength groups no longer beat sham.
A 2022 review in BMJ Open of tendon pain found pain fell by about 13 mm on a 100 mm scale. Long-term data weren’t available.
| Use | What reviews found | Certainty |
|---|---|---|
| Pattern hair loss | Improved hair density | Not formally rated, but consistent trials |
| Knee osteoarthritis pain | Less pain, no better function | Low to very low |
| Tendon pain | Less pain short term | Uncertain, small trials |
| Diabetic foot ulcers | More ulcers healed | Very low |
| Wrinkles | Mixed results | No pooled evidence |
Safety: what we know
Red light appears safe in the short term. Cleveland Clinic says it “isn’t associated with any side effects, at least, if used short-term and as directed”.
The AAD warns that people with darker skin are more sensitive to visible light, which can cause dark patches. It advises eye protection if the directions say so, and not to swap sunglasses for goggles.
Both bodies say long-term effects are unknown. A 2023 review found no trial data linking red light skin treatments to cancer.
What “FDA cleared” means
Many home devices are “FDA cleared”. That’s not the same as approved.
Clearance means the FDA found a device “substantially equivalent” to one already on the market. As the AAD puts it, “FDA cleared doesn’t tell you anything about how effective the device is.”
What earlier research found
Knee pain
A 2019 meta-analysis in BMJ Open pooled 22 trials with 1,063 people with knee osteoarthritis. Pain fell by about 14 mm on a 100 mm scale compared with placebo.
It noted that light therapy “is not recommended in major knee osteoarthritis (KOA) treatment guidelines”.
Diabetic foot ulcers
A 2021 meta-analysis in the International Wound Journal of 13 trials found light therapy roughly doubled the rate of complete healing. The quality of evidence was rated very low.
Cancer safety
A 2023 review in Aesthetic Surgery Journal found “no relevant clinical trial data linking PBM with any significant adverse events”, including cancer. The author consults for a skin care company.
How it fits together
Across uses, there are real signals, especially for hair. But trials are small, devices differ, and many studies have industry ties.
How much should you trust this?
Early. Hair-loss evidence is fairly solid, but most other uses aren’t.
What makes it convincing
- Hair trials were double-blind and compared real devices with sham ones.
- Several separate reviews find some pain relief.
- Short-term safety looks good.
What makes me cautious
- Many trials are small, short and use very different devices.
- Several trials were funded by device makers.
- The pain evidence mostly comes from clinic infrared lasers, not home red lights.
- Wrinkle trials give mixed results, with no pooled analysis.
- Long-term effects are unknown.
| The evidence shows | The evidence does not show |
|---|---|
| Home devices can improve mild to moderate hair loss | That they regrow a full head of hair |
| Some short-term pain relief for knees and tendons | That home red LED panels relieve pain |
| Good short-term safety | Long-term safety |
| FDA clearance for many devices | That cleared devices work |
What this means for you
- Hair loss is the best bet. If you try a device, choose one tested in trials and expect modest results over months.
- Be sceptical of wrinkle claims. The trials are small and mixed.
- Protect your eyes. Follow the device directions, and use proper goggles, not sunglasses.
- Take care with darker skin. The AAD warns that visible light can cause dark patches.
- Talk to a doctor for pain or wounds. Proven treatments should come first.
- Ignore “FDA approved” claims. The AAD says those words have no meaning for these devices.
The American Academy of Dermatology’s guide to red light therapy explains what it can and can’t do.
In this video, a Cleveland Clinic expert explains what red light therapy is:
What we still don’t know
- Does it work for wrinkles? Bigger, independent trials are needed.
- Which devices and doses work best? Studies used very different settings.
- Do the results last? No hair trial ran past 26 weeks.
- Is long-term use safe? Nobody knows yet.
- Do home devices match clinic ones? The AAD says clinic devices are more powerful.
My take: real for hair, hype for the rest
What I like about the hair research is that it compares real devices with fake ones, with neither side knowing which they had. That’s how you test a gadget.
I’m less convinced by the glowing skin claims. Most of that evidence is small, short or funded by the people selling the mask.
If you’re losing hair, a well-tested device might help a little. For wrinkles, I’d wait for better trials.
Last reviewed: 2026-10-04
Covers: Whether red light therapy works for hair loss, wrinkles, pain and wounds, its safety, and what FDA clearance means
Evidence: Early — fairly consistent for hair loss, weak or very low certainty for most other uses
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