Photobiomodulation (PBM) is the therapeutic application of low-level near-infrared and red light to tissue. Near-infrared light penetrates the skull and is absorbed by mitochondrial cytochrome c oxidase, supporting cellular energy production and modulating inflammatory signaling. Because PBM is so helpful in tissue healing, increasing bloodflow, and reducing inflammation, the clinical applications most relevant to our functional neurology approach are in post-concussion recovery, neurodegenerative support, and brain-fog protocols.