Does red light therapy really help against skin ageing?

Red light therapy stimulates collagen production in the skin. Red light in the range of 630 to 760 nm penetrates more deeply than blue or yellow light, thereby activating energy processes in skin cells that drive collagen synthesis. This mechanism is biologically plausible and is described in multiple review studies.

The clinical studies that exist show positive results, but they are small and methodologically limited. A study in 20 women using an LED mask at 630 nm (twice a week, three months) showed progressively better scores on wrinkles, firmness, elasticity and complexion, and those effects persisted one month after stopping. A comparable study in men, using a commercial mask over six weeks, found improvements in fine lines and skin texture through both self-reporting and digital photo analysis. Neither study had a control group, which makes it difficult to distinguish from a placebo effect. In addition, two of the four authors of the women's study had a financial interest in the mask being tested.

A broad review article in a leading American dermatology journal (2024) draws a somewhat stronger conclusion: photobiomodulation, the umbrella term for therapeutic red and near-infrared light, is promising for skin rejuvenation and conditions such as acne and scarring. The safety profile is rated as favourable. But the authors are clear: no standardised treatment guidelines yet exist, and people with darker skin tones have barely been included in the research.

One point of concern deserves separate mention: not all light therapy is automatically beneficial. With infrared light, the dose makes the difference. Therapeutic doses can repair skin, but the doses received through solar infrared have actually been linked to skin ageing. This applies less to low-dose red LED therapy, but it underlines that wavelength, intensity and frequency of use all matter.

Home LED masks are described in the studies as safe and easy to use. But exactly which combination of wavelength, dose and session frequency works best has not yet been established. Anyone seriously considering trying this would do well to choose a certified device and follow the instructions, especially with sensitive or darker skin.