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This comprehensive review examines photobiomodulation (PBM) therapy, a treatment that uses specific wavelengths of red and near-infrared light to potentially improve brain function. Researchers analyzed existing studies on how this light therapy works at the cellular level and its potential applications for various neurological and psychological conditions.

The therapy works by stimulating mitochondria - the powerhouses of our cells - specifically targeting an enzyme called cytochrome c oxidase that's crucial for energy production. When brain cells absorb this light, they produce more ATP (cellular energy), reduce inflammation, and activate protective mechanisms against cell death. The light also appears to promote the growth of new brain cells and connections between neurons, which could be particularly valuable for brain health and cognitive function.

Studies suggest this treatment may benefit conditions like dementia, Parkinson's disease, stroke, traumatic brain injury, and depression. However, one major challenge is ensuring enough light actually reaches brain tissue, since light weakens as it passes through skin and skull. Researchers are exploring different delivery methods, including placing light sources inside the nose or skull to improve effectiveness.

While this research is promising for metabolic health and longevity - given the critical role of mitochondrial function in aging and neurodegeneration - most evidence comes from preliminary studies. Patients interested in this therapy should discuss it with their healthcare provider, as more clinical trials are needed to establish standardized protocols and confirm long-term benefits and safety.