Once delivered to the tissue by the LEDs, the light photons impact healing through two main mechanisms: by increasing the release of nitric oxide in the blood vessels and increasing the production of ATP in the mitochondria (energy generators) of the cells. Nitric Oxide, an important signaling molecule in the body, causes vasodilation (increased diameter of the blood vessels) which allows for greater blood flow and thus delivery of oxygen and vital nutrients. This enhanced circulation ultimately leads to decreased pain and inflammation and regeneration of damaged tissues. Other effects of nitric oxide include improved lymphatic activity, increased bone mineralization, increased phagocytosis (immune response clearing bacteria and cellular debris), increased angiogenesis (building of blood vessels) and increased RNA/DNA synthesis (cell replication). In addition to increased circulation, light also increases the production of our cell’s energy currency called ATP (adenosine triphosphate) through direct excitation of special proteins in the mitochondrial membrane. Increased levels of ATP results in enhanced cellular metabolic activity and repair, improved muscle contraction, improved nerve conduction, and overall better energy!