Does red light therapy work? What the evidence says, and how it differs from hyperbaric oxygen

Red light panels, LED face masks and infrared beds are sold for almost everything, from wrinkles to muscle recovery. So does red light therapy work? For a few specific uses there is good evidence. For many of the wider claims there is not, or not yet.

People sometimes ask us whether red light and hyperbaric oxygen do the same job. They do not, and this guide explains why. We should also say plainly that HBOT Medics does not offer red light or infrared therapy, so there is nothing to sell you on that side of the comparison.

What is red light therapy?

Red light therapy is the everyday name for photobiomodulation, also called low-level light therapy or low-level laser therapy. A device shines red or near-infrared light from LEDs or a low-power laser onto the skin or another tissue.

In medical use it can be very targeted. NICE's guidance on low-level laser therapy for oral mucositis describes a hand-held probe delivering red or near-infrared light to the lining of the mouth, with the aim of promoting healing, reducing inflammation and increasing cell metabolism.

It is not the same as photodynamic therapy. The NHS explains that photodynamic therapy combines a light-sensitive medicine with a light source to destroy abnormal cells, and it is used for conditions including basal cell carcinoma, a type of skin cancer. NICE's acne guideline says photodynamic therapy can be considered for adults with moderate to severe acne when other treatments have not worked, are not tolerated or are not suitable. That is a medical treatment involving a drug, not a home red light panel.

Does red light therapy work? Where the evidence is strongest

Oral mucositis during cancer treatment

Oral mucositis is painful inflammation and ulceration of the mouth lining. It is a common side effect of chemotherapy or radiotherapy for head and neck cancer, or before a bone marrow transplant.

NICE guidance on low-level laser therapy for preventing or treating it states that current evidence shows no major safety concerns, and that evidence on efficacy is adequate in quality and quantity. The procedure can therefore be used with standard arrangements for clinical governance, consent and audit. NICE's committee reviewed 11 sources, including 3 systematic reviews and meta-analyses and 7 randomised controlled trials.

That is a real, recognised use. It is also a narrow one: trained clinical teams, a defined device and dose, light applied inside the mouth, for people having cancer treatment. It does not tell you what a general wellness panel will do.

Skin and wrinkles

Home LED masks are mostly sold for skin. A 2025 randomised, double-blind, sham-controlled trial tested a home mask combining 630 nm red LED and 850 nm infrared light on crow's feet wrinkles. Of 60 adults enrolled, 59 completed the study, using the mask for 9 minutes, 5 times a week, for 12 weeks. Independent raters judged the wrinkles improved in 86.2% of the treatment group and 16.7% of the sham group. The study was funded by a commercial company, although the authors say the design and analysis were independent.

One small positive trial is encouraging rather than conclusive, and it measured wrinkles around the eyes, not the broader claims often made for masks.

The wider research picture

There is a great deal of photobiomodulation research, but its quality is uneven. A 2026 meta-research study examined 285 systematic reviews published between 1999 and 2025. About 40% were about dentistry and problems of the mouth and face, and 19% about musculoskeletal disorders. Only 45% had a registered protocol, and only 18.5% used GRADE, a standard method for rating how certain the evidence is. The authors also reported high levels of duplication.

In practice, results depend on the wavelength, the dose, the device and the condition. A positive trial of one protocol does not mean every product works for every claim on the box.

What are the side effects of red light therapy?

In the 2025 mask trial there were four minor adverse events and no serious reactions, and NICE found no major safety concerns with low-level laser therapy for oral mucositis. The eyes are the area to take seriously.

• A 2020 case report described retinal damage in a 37-year-old woman who used a blue LED face mask for 20 minutes every 2 days for a month. The authors advised making sure the eyes are covered during LED mask use, and said red or infrared light, with longer wavelengths, is preferable for retinal safety.
• Red light is not automatically safe for the eyes either. A 2023 case report in JAMA Ophthalmology described retinal damage in a 12-year-old with short-sightedness after repeated low-level red-light laser exposure.

Sensible precautions: follow the device instructions, use any eye protection supplied, do not look directly into the light, and speak to a GP, optometrist or pharmacist first if you have an eye or skin condition or take medicines that affect how your skin reacts to light.

What has the ASA said about red light therapy claims?

The Advertising Standards Authority has ruled against several light therapy adverts.

In a 2021 ruling, a seller of red light devices had claimed benefits for pain relief, healing, anxiety and depression, and rheumatoid arthritis. The ASA found that the product's certification related to electrical lighting and electromagnetic compatibility, not medical device regulations, and that marketing it for depression and arthritis discouraged essential treatment. The ad could not appear again in that form.

In a 2025 ruling on LED face masks, claims about acne and rosacea were treated as medical claims. The ASA said it had seen no evidence the product was registered with the MHRA or carried the appropriate conformity marking, and the ads breached the advertising code, including where the claims appeared in customer testimonials.

The practical lesson for buyers: if an advert says a device treats a medical condition, the seller should be able to show the product is regulated for that purpose.

How is hyperbaric oxygen therapy different?

NHS England describes hyperbaric oxygen therapy (HBOT) as the delivery of oxygen at a pressure greater than normal, so that more oxygen can dissolve in the blood plasma. It works through the lungs and the blood, not through light reaching a patch of tissue.

A StatPearls review of hyperbaric physics gives the scale. Plasma holds about 3 mL of oxygen per litre at normal pressure, rising to about 60 mL per litre during HBOT at 3 ATA.

The evidence base is different too. NHS England routinely commissions HBOT for decompression illness and gas embolism, and does not routinely commission it for several other uses, including diabetic foot ulcers. Research continues elsewhere, such as persistent symptoms after brain injury, where trial results are mixed. Our head injury page sets out those trials with their limits.

At HBOT Medics, one person at a time uses a soft-shell chamber at 1.5 ATA, after medical screening. You can read what HBOT is, our longer guide to what hyperbaric oxygen therapy is, and who HBOT is not suitable for.

	Red light therapy	Hyperbaric oxygen therapy
What it uses	Red or near-infrared light from LEDs or low-power lasers	Concentrated oxygen breathed at raised pressure
How it acts	Light applied to skin or other tissue	Extra oxygen dissolved in blood plasma
Clearest UK guidance	NICE: can be used for oral mucositis from cancer treatment	NHS England: routinely commissioned for decompression illness and gas embolism
Main safety questions	Eye exposure and device quality	Ear pressure, medical screening and oxygen fire safety

Why are red light therapy and HBOT not interchangeable?

They use different physical agents, act on the body in different ways, rest on different evidence and carry different risks. A trial showing red light helps oral mucositis tells you nothing about hyperbaric oxygen, and a hyperbaric trial tells you nothing about a face mask.

If you see the two offered together as a package, ask for the evidence for each one separately, for your specific problem. Start from the problem rather than the device: talk to your oncology team about side effects of cancer treatment, your GP or a dermatologist about skin conditions, and your GP about symptoms that have not settled after an injury or illness.

If your question is specifically about hyperbaric oxygen and whether it is worth discussing for your situation, you can see available times. No referral needed. Medical consultation included.