Red and near-infrared light are among the most studied wavelengths in LED skincare. The research field is called photobiomodulation. Here we summarise what the studies have looked at – simply explained.
How does it work?
When red and near-infrared light reach the skin, some of the light is absorbed by the mitochondria – the cells' power plants. The research describes how this may support the cells' energy production and thereby the skin's own processes, such as the formation of collagen and elastin.
Red light – 630 nm
Red light reaches the upper layers of the skin and has been studied for fine lines, elasticity and firmer skin.
- Wunsch & Matuschka (2014), Photomedicine and Laser Surgery. A controlled study with 136 participants who received red light twice a week, 30 times in total. The participants got a more even skin tone and smoother skin, and ultrasound showed increased collagen density compared with the control group.
- Lee et al. (2007), Journal of Photochemistry and Photobiology B. LED light at 633 nm and 830 nm reduced wrinkles and improved elasticity, and tissue samples showed more collagen and elastin fibres.
Near-infrared – 850 nm
Near-infrared light is invisible to the eye and reaches deeper than ordinary red light – down into the dermis, where the skin's connective tissue is formed. That is why wavelengths around 800–850 nm have been studied for the skin's own healing process.
- Avci et al. (2013), Seminars in Cutaneous Medicine and Surgery. A review of research on light and skin that summarises studies on wound healing, scars and rejuvenation.
- Barolet & Boucher (2010), Lasers in Surgery and Medicine. A case series in which LED light at 805 nm was used after surgery to reduce the risk of thickened scars.
What does it mean for you?
The studies show why red and near-infrared light are so interesting in skincare. The results apply to the studies' own set-ups, light doses and participants, and experiences vary from person to person.
Silkeshud Aura is a cosmetic product for home use and is not intended to diagnose, treat or cure any disease. If you have a skin condition or a wound that needs care – contact a healthcare professional.