The History
NASA originally began experimenting with red light therapy on plant growth in space and then to help heal wounds in astronauts. Like many developments, other potential uses began to be investigated.
In fact, red light therapy is already widely medically accepted in its use in Photodynamic Therapy. In this therapy, low-power red laser light is used to activate a photosensitizer drug. The interaction creates a chemical reaction that destroys cells and is used to treat some skin conditions. (Cleveland Clinic)
Red and near-infrared light are part of the electromagnetic spectrum of light emitted by the sun. These wavelengths of light are “bioactive” in humans. Red light between 600–700nm offers benefits for skin texture and tone, smoothing fine lines and wrinkles, promoting collagen production, and generally rejuvenating the appearance of skin and hair. Near-infrared light (NIR) 700nm–1100nm penetrates deeper into the tissues to assist with wound healing, muscle recovery, nerve injury, and joint pain.