What Red Light Therapy Actually Does to Skin

Light therapy gets described in a lot of different ways, most of them vague. Here is the part that is actually well established, and the part that is still being worked out.

It starts in the mitochondria

Red and near-infrared light pass into skin and are absorbed by cytochrome c oxidase, an enzyme in the mitochondrial respiratory chain. That absorption briefly changes how the enzyme behaves, which in turn affects cellular energy production and signalling. Researchers call the effect photobiomodulation. It is not heat, and it has nothing to do with the ultraviolet part of the spectrum that damages skin.

What clinical studies have measured

In a controlled trial published in Photomedicine and Laser Surgery in 2014, 136 volunteers took part and 113 were treated twice a week for 30 sessions with either red light (611 to 650 nm) or a broader red to near-infrared spectrum (570 to 850 nm). Compared with untreated controls, the treated groups showed measurable improvements in skin roughness, assessed by digital profilometry, and in intradermal collagen density, measured by ultrasound, along with higher satisfaction scores.

An earlier study in the Journal of Cosmetic and Laser Therapy combined 633 nm and 830 nm across nine treatments in 31 subjects with facial lines. At the twelve-week follow-up, 52% of subjects showed a 25 to 50% improvement in photoaging scores, and 81% reported a visible improvement in the lines around their eyes.

What that means for a routine at home

• Effects build over weeks, not days. Almost every published protocol runs several sessions a week for one to three months.
• Consistency matters more than session length. Longer sessions are not better sessions.
• Texture and tone tend to shift before deeper lines do.
• Published studies use specific devices at specific doses. An at-home device is not automatically equivalent, which is why the wavelengths, the irradiance and the session length on a product page are worth reading.

What it is not

Light therapy is not a replacement for sun protection, and it is not a treatment for a medical skin condition. Results vary between people, and some of the published work involves small numbers of participants.

Kivorla devices are general wellness devices, not medical devices. If you have a skin condition, are pregnant, or take photosensitising medication, speak to a qualified healthcare professional before starting.