It has been known for some time that near infrared and red light can be absorbed by a cellular chromophore called cytochrome c oxidase, and this light energy can be used to help produce ATP in the cell's mitochondria. ATP is the basic unit of energy in our cells, which humans and animals use to get things done. Cells in every part of the body can do this, so exposure to all parts of the body can help produce energy. This is real science, not hokum. It is how photobiomodulation can help the body heal and improve health.
On the improbable off chance that anyone is interested:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4387504/
On the improbable off chance that anyone is interested:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4387504/
