Nitric oxide is the signalling molecule that opens up our vascular system, signals our immune system, normalizes our blood pressure, helps us release toxins and increase vitality. We have long known that light helps our body to release and utilize this critical life force molecule. When we shine light into the body, right where we shine that light can have a significant impact on nitric oxide levels and its work on dilating blood vessels, creating new pathways around an injury to protect and nourish our heart and vascular system.
https://www.ncbi.nlm.nih.gov/pubmed/19328206