Laser Therapy is an emerging medical and veterinary technique in which exposure to low-level laser light emitting diodes, stimulates cellular function with beneficial clinical effects. The term adopted by NASA and U.S. military scientists is Photobiomodulation. Effectiveness depends on the Color of the light (wavelength), Intensity, and the Amount of energy delivered. The first rule is that energy must be absorbed. What absorbs light and What is its Mechanism of Action? Join Dr.’s Carraway and Eells for an insightful discussion of the interactions of light and tissue, and its clinical applications.