Red Light Therapy 2025: A Half-Year Review of Significant Papers

Red Light Therapy 2025: A Half-Year Review of Significant Papers

By Dominic Lamb | Published 31st May 2025, updated April 2026

Someone asked me recently whether red light therapy is "still a thing" or whether it was just a pandemic-era wellness trend that had run its course. I said: open PubMed, search photobiomodulation, filter for 2025 and read for twenty minutes. They came back with a list of questions. That's usually how it goes.

The first half of 2025 produced several solid clinical trials on humans - not mice, not cell cultures, but people with real conditions getting measurable results. Here's what the research actually showed.

Hair regrowth: 650 nm confirmed again

A clinical trial published in early 2025 compared three wavelengths - 650 nm red light, 1550 nm and 14,000 nm far-infrared - in patients with hair loss. All three groups saw some improvement, but 650 nm came out on top with an average increase of 14 hairs per cm². The control group, receiving no light treatment, lost hair over the same period.

If you are noticing thinning and want a non-pharmaceutical option with evidence behind it, devices in the 660 nm range are the practical choice - 650 nm lasers are harder to find in consumer devices, but 660 nm LEDs produce comparable results at the tissue level. There is also emerging evidence that scalp light penetrates to underlying brain tissue, which is why the same devices used for hair are being studied in cognitive contexts. That is a longer conversation but worth knowing about.

See our hair and specialist devices.

Tooth sensitivity: 660 nm reduced pain after dental work

A randomised study on dental patients found that 660 nm red light significantly reduced sensitivity and pain after deep cleaning and scaling within 30 days - less sensitivity to cold drinks, less discomfort when brushing. The control group showed no comparable improvement.

Dental applications of photobiomodulation actually have some of the strongest evidence in the entire field. The tissue is accessible, the doses are well-studied and the results are consistent. If you or someone in your family deals with sensitivity after dental procedures, this is one of the more straightforward use cases for a portable red light device.

Diabetic foot pain: measurable relief in 10 days

This one surprised me when I first read it - not that it worked, but how quickly. In a Chinese clinical trial on patients with diabetic neuropathy, 632.8 nm red light applied to the feet produced lower pain scores, improved sensitivity and reduced blood markers of nerve damage after just 10 days.

The mechanism is mitochondrial - cytochrome c oxidase in the nerve cells absorbs the photons, ATP production improves, inflammation reduces, nerve signalling recovers. This is exactly what photobiomodulation is designed to target. A light therapy wrap or handheld torch makes this practical to do at home. For this application I would use the torch or wrap from the portable range.

Chronic vulvar pain: significant improvement in a randomised trial

A randomised controlled trial on women with provoked vestibulodynia - chronic pain at the vaginal entrance - found increased pain threshold and reduced tampon-related pain after red light therapy. The control group showed no improvement over the same period.

This is an underreported condition that affects more women than most people realise, and treatment options are limited. Red and near-infrared light delivered via wrap or targeted device is non-invasive and, based on this trial, worth serious consideration. I mention it here because the people who need this information rarely see it.

Pressure sores: blue light accelerated healing

This sits slightly outside the main red light category but deserves inclusion. Blue light in the 400-450 nm range applied to stage 2-3 pressure ulcers produced significantly faster healing than in the control group. The antibacterial and tissue-stimulating properties of short-wavelength light are increasingly well-documented for surface wounds.

I use blue light in very short bursts myself - the brief oxidative stress response it produces seems to complement rather than compete with red and near-infrared sessions. Natural sunlight does something similar; the full spectrum contains all three ranges working together, which is part of why artificial indoor lighting is such a poor substitute.

Nasal congestion from allergies: improved airflow and symptom scores

A study using intranasal red and near-infrared light found reduced allergy symptoms and improved nasal airflow in participants who received the light treatment. The effect goes beyond simple decongestion - intranasal light influences nitric oxide production, local immune signalling and blood flow in a way that topical medications don't.

There is also evidence that intranasal near-infrared light reaches brain tissue and influences neurological function through this route. The torch with 810 nm capability covers both angles - nasal mucosa and deeper penetration simultaneously.

Depression and sleep: the sleep finding matters more than the mood finding

A transcranial photobiomodulation trial on patients with major depressive disorder produced an interesting result. Mood improvement was seen in both the treatment and placebo groups - but only the red light group showed measurably deeper, more restorative sleep.

This is important. Sleep is where the body repairs itself. Mood improvements from placebo are common and expected - they reflect the genuine therapeutic benefit of structured care and attention. But sleep architecture changes are harder to fake and harder to achieve. The fact that transcranial red light moved the needle on deep sleep, specifically, is the finding I would focus on here. It is consistent with what we understand about mitochondrial function in brain tissue, circadian regulation and neuroinflammation.

Age-related macular degeneration: the LIGHTSITE III results

The LIGHTSITE III study tracked patients with dry AMD receiving red and near-infrared photobiomodulation over an extended period. Patients in the treatment group maintained or improved their vision and showed a 73% reduced risk of progressing to geographic atrophy - permanent, irreversible vision loss.

That is a significant number. Not "may slow progression" - 73% reduced risk of the worst outcome. For anyone dealing with dry AMD or supporting a family member through it, this is worth discussing with an ophthalmologist. For this application specifically I would recommend a DC-powered, low-flicker device - the travelmate or similar battery-powered option rather than a mains panel. You can read the full write-up at Retinal Physician.

What this means practically

These are not abstract results. They are real people, with real conditions, in randomised controlled trials. Hair loss, tooth pain, neuropathy, pelvic pain, wound healing, congestion, sleep, vision - these are things that affect the people who contact me every week.

The common thread across all of it is mitochondrial function. When cells have more energy, they repair faster, signal better and resist damage more effectively. Red and near-infrared light is one of the most direct ways to support that process. Not the only way - sleep, diet, outdoor light exposure and movement all matter. But it is a tool with a growing body of serious evidence behind it.

I test every device I sell with a spectrometer before it leaves. The wavelengths and irradiance values you need to replicate these results are not delivered by every panel on the market. If you want help matching the right device to your specific situation, send me a message - that is genuinely what I am here for.

Browse the full panel range or the portable and specialist devices for targeted applications. More detailed context on the research behind these protocols is in the post Does Red Light Therapy Work? What the Science Says for Norwegians.