Red light therapy (RLT), sometimes described as low-level light therapy or photobiomodulation, uses specific wavelengths of light to interact with cells. Research suggests this light may influence mitochondria—the structures that help cells produce energy—and cellular processes involved in recovery.

Red light therapy is different from heat-based infrared treatments. The effects depend on the device, wavelength, dose, and individual needs; it is not a substitute for appropriate medical care.