NASA originally developed it for plant growth experiments on shuttle missions and later found it to have promise for wound treatment. LED light therapy is now used by some clinics to help regenerate the skin from aging. It’s also used for acne.
LED lights have been around since the 1960s, but have only recently been used as a skin treatment. Different wavelengths of the visible light spectrum correspond to different colors of LED light and penetrate the skin to different depths. Depending on how deeply they penetrate, LED lights are thought to have different biological effects.
Used with numbing before hand, red and blue lights are typically promoted in LED skin treatments.
Experts believe that red LED light acts on cells in the skin known as fibroblasts, which play a role in production of collagen, a protein that makes up a large part of connective tissue and helps the skin to recover when it’s harmed. So, in theory, red light could help to reverse some of the signs related to photoaging in the skin.