How LLLT Works?
Light from a laser has an effect on your body when the specific wavelength of light is absorbed by molecules of the target tissue. When light energy 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.
Photobiomodulation in the Treatment of Male and Female Pattern Hair Loss.
Many hypotheses have been offered to explain how LLLT photobiomodulation may stimulate new hair growth. While LLLT’s chemical and physical effects have occurred with new hair growth attributed to LLLT, none of these effects has been shown as the primary effect in stimulating new hair growth. It is however, hypothesized that LLLT mediates new hair growth through either a direct or an indirect increase in proliferative activity within the hair follicle epithelial matrix.
Evidence also points out that laser energy reverses follicular apoptosis (programmed cell death) and from observations of wavelength stimulation of optimal hair growth and from an ex-vivo study, it has been shown precisely what wavelengths, power, intensity are necessary for optimal effect in stimulating new hair growth.
It is important to note that heat is not associated with the photochemical and photo therapeutic effects of LLLT. While there are visible red wavelengths and low wattage associated with LLLT, it is a “cold light” laser produces no sensation on the skin of persons undergoing treatment.