Low-Level Laser Therapy (LLLT) in hair restoration utilizes cool lasers to stimulate hair growth and reduce hair loss. LLLT is based on the scientific principle of photo-biotherapy. Photo-biotherapy occurs when laser light is absorbed by cells and stimulates cell metabolism and protein synthesis. Although the exact mechanism by which laser light promotes hair growth is still unknown, it appears to stimulate the follicles on the scalp by increasing energy production and by reversing miniaturization (the process leading to thicker hair shafts and a fuller look).
Laser light is in the visible red light spectrum and is generated in a laser diode. The energy level is far below that of laser beams that cut or burn tissue. The low-level red laser light has a very low absorption rate in human tissue making it safe for use in the treatment of hair loss.
Low energy lasers have been used for over thirty years to accelerate healing after wounds or burns and to reduce pain. In 1992, Pontinen published the first paper discussing its possible use in promoting hair growth. Since then there has been much progress is defining the exact parameters necessary to accomplish this. In 2007, the FDA cleared for marketing the use of low-level lasers for the treatment of androgenetic hair loss in men. This clearance was based on the device’s safety, and not on its effectiveness in treating hair loss.
