When oxygen is used at a high pressure, it is able to act like a drug, enacting enduring changes in the cell and tissue, due to its action on DNA and other parts of the cell. The high concentration of oxygen stimulates DNA, which leads to growth of new tissue, and draws in stem cells to injured areas. HBOT also helps to counteract damage done to DNA and “unfreeze” DNA which has been made dormant as a result of injury.