LLLT primarily affects the mitochondria, the powerhouse of the cell. When cells absorb light energy, it enhances the production of adenosine triphosphate (ATP), the cellular currency for energy. Increased ATP production leads to improved cellular function and repair. Additionally, LLLT influences the production of reactive oxygen species (ROS) and nitric oxide (NO), which play roles in cellular signaling and vasodilation, respectively. These biochemical changes culminate in reduced inflammation, pain relief, and accelerated tissue repair.