Low-Level Laser Light is one of the most effective therapies to treat hair loss. Currently, over-the-counter laser therapy devices for hair growth are available through convenient hands-free systems, or less convenient hand-held devices. Either product may be used at home, and does not require the supervision of a physician.
Lasers are widely used in medicine and also throughout a variety of industries, in a multitude of varying capacities. The laser energy used to stimulate hair growth is visible in the red light spectrum. The laser light used in promoting hair growth is defined as Low-Level Laser Therapy (LLLT). LLLT is sometimes included under a broader definition of 'Phototherapy' called Low-Level Light Therapy, where the light-emitting device may be a laser and/or light-emitting diode (LED).
Light from a laser in a specific wavelength has an effect on your body when it is applied for a sufficient length of time. It is theorized that when the laser light is absorbed by target tissue molecules, the energy level of the molecules is increased and the molecules respond by 'working off' the excess energy with adaptive changes. These changes may be chemical or physical, and they may have biological effects on the target tissue or surrounding tissues.
Because the changes in the molecules are brought about by phototherapy, chemical changes are said to be due to 'photochemistry' and physical changes to 'photophysics.' As a result, the biological effects on tissue are called photobiomodulation.