Laser therapy was discovered more or less by accident in Eastern Europe in the early 1960's. Since then, scientists all over the world have conducted thousands of studies and clinical trials on the use of laser therapy, both in vivo and in vitro. While the majority of the studies have concentrated on the biological, practical effects of laser therapy, quite a few have attempted to explain the photobiological mechanisms behind the results.

An interesting theoretical model has to do with the increased production of ATP (adenosine triphosphate), observed in many clinical trials. ATP acts as fuel for the cell and is produced by the mitochondrion, often referred to as the power plant of the cell. The mitochondrion has an inner membrane of large relative area, folded into a very tiny space. The surface of the membrane is packed with mushroom-shaped antenna-pigments that are receptive to photon energy – light. The mitochondrion utilizes this photon energy and transforms it into another kind of energy: ATP.

See http://www.dr-wilden.de/ehtmls/puben2.html

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