Red light & infrared: what light therapy can really do
Red-light panels promise better skin, faster recovery and more energy. What lies behind Photobiomodulation, what is backed by evidence – and where the hype outpaces the data.
What red light therapy is
This refers to panels or lamps that emit red light in the range of around 630 to 660 nanometres and near-infrared around 810 to 850 nanometres. In the scientific literature, the technique is called photobiomodulation. It has nothing to do with the heat lamp from a home medicine cabinet, and nothing to do with a tanning bed.
The difference from a heat lamp lies in the mechanism of action: it's not the heat that's supposed to have an effect, but the light at a specific wavelength. Red light penetrates a few millimetres into the skin; near-infrared penetrates several centimetres — which is why the former is used for skin and the latter for muscles and joints.
The proposed mechanism of action
Hamblin described the prevailing explanation in 2017: light at these wavelengths is absorbed by cytochrome c oxidase, an enzyme in the mitochondrial respiratory chain. This is thought to release bound nitric oxide, which briefly boosts the cell's energy production.
This mechanism is plausible and well established in cell cultures. Whether it takes place in humans through skin, fat and muscle to a clinically relevant extent is the open question — and that's exactly what determines how seriously you should take the manufacturers' promises.
What's best supported: the skin
The strongest evidence exists for skin conditions. Wunsch and Matuschka compared treated and untreated groups in a 2014 controlled study with 136 participants: skin roughness, collagen density and wrinkle depth improved measurably, which was also confirmed by ultrasound measurements.
There are also solid findings for wound healing and for oral mucositis during chemotherapy — the latter is in fact the best-supported medical application of all and has been included in clinical guidelines. Controlled studies with positive results also exist for hair growth in androgenetic hair loss.
What's less well supported
For muscle recovery and performance enhancement, the studies are small, short and methodologically inconsistent. Some papers show less muscle soreness and faster return of strength; others find no effect at all. A confirmed benefit cannot be claimed.
The evidence gets even thinner for the bigger promises: more energy, better sleep, fat loss, hormonal effects. There is no solid human evidence for any of these. If you're spending several hundred francs on a panel, you should know that you're probably getting something for your skin — but for the rest, based on current evidence, not much.
What to look for in a device
Three figures matter: the wavelength, the actual power density delivered in milliwatts per square centimetre, and the distance at which that applies. Many manufacturers only state the lamp's input wattage — which says nothing about what actually reaches your skin.
Eye protection is essential: near-infrared is invisible and doesn't trigger the blink reflex. Protective goggles are a must. There are also medications that increase light sensitivity — including some antibiotics, St John's wort, and certain skin products. If you have a skin condition, a history of skin cancer, or are pregnant, talk to a doctor before using it. This content does not replace medical advice.
How the YUTHI app helps you
You log your red light Treatments with duration and body area, and see them alongside sleep, recovery and your own wellbeing. Because the general evidence base outside of skin is thin, your own personal trend matters more here than any review article.
Vito and Vita put it in context rather than promote it. They tell you what the evidence supports and what it doesn't — and they remind you to stick with a treatment for at least eight weeks before judging whether it's making a difference for you.
That was the snapshot. The app turns it into daily support.
Measure every day instead of calculating once: Vito or Vita puts your numbers in context, builds you a weekly plan and speaks up when something stands out.
Launching at the end of 2026 — iPhone first, Android to follow. Let me know when it’s out ↓
Sources
- Hamblin MR. Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophys. 2017;4(3):337-361.
- Wunsch A, Matuschka K. A controlled trial to determine the efficacy of red and near-infrared light treatment in patient satisfaction, reduction of fine lines, wrinkles, skin roughness, and intradermal collagen density increase. Photomed Laser Surg. 2014;32(2):93-100.
- Zadik Y, Arany PR, Fregnani ER, et al. Systematic review of photobiomodulation for the management of oral mucositis in cancer patients. Support Care Cancer. 2019;27(10):3969-3983.
- Ferraresi C, Huang YY, Hamblin MR. Photobiomodulation in human muscle tissue: an advantage in sports performance? J Biophotonics. 2016;9(11-12):1273-1299.