Transcranial Photobiomodulation for Brain Diseases

This review focuses on transcranial photobiomodulation (tPBM), a non-invasive therapy that applies red to near-infrared light to the scalp to influence brain tissue and improve neurological function. The paper reviews both preclinical and clinical evidence for tPBM in brain-related diseases and discusses mechanisms, therapeutic potential, safety, and current limitations. It highlights tPBM as a promising low-cost and non-invasive intervention, though standardized clinical protocols are still needed.

Key points:

• Mechanism of action – tPBM may improve mitochondrial activity (especially cytochrome c oxidase), increase ATP production, regulate oxidative stress, and improve cerebral blood flow.
• Neuroprotective effects – It may reduce neuroinflammation, apoptosis, and oxidative damage while promoting neuronal survival and repair.
• Clinical applications – The review discusses use in stroke, traumatic brain injury (TBI), Alzheimer’s disease, Parkinson’s disease, depression, and other neurological disorders.
• Cognitive and brain function benefits – Some studies suggest improved cognition, memory, mood, and brain metabolism after treatment.
• Non-invasive and generally safe – tPBM is highlighted as relatively affordable, easy to administer, and with a favorable safety profile in studies reviewed.
• Limitations – Challenges include light penetration depth, variability in wavelengths/dosage, and limited large-scale randomized clinical trials.
• Future direction – More standardized human clinical studies are needed to optimize treatment parameters and confirm long-term effectiveness.

Simple takeaway:
Transcranial photobiomodulation (tPBM) shows promising clinical potential as a non-invasive therapy for brain diseases by improving brain metabolism, blood flow, and neuroprotection, but stronger clinical evidence and standardized treatment methods are still needed.

https://pmc.ncbi.nlm.nih.gov/articles/PMC10840571/