A medical doctor recommended the book RED LIGHT THERAPY by Ari. Whitten https://www.amazon.com/Ultimate-Guide-Light-Therapy-Near-Infrared/dp/1721762825/ref=sr_1_1?s=books&ie=UTF8&qid=1544369478&sr=1-1&keywords=near+infrared+light+therapy
The Red Light/Near Infrared story reminds me of the oxygen therapies, thousands of studies, unknown to mainstream medicine, and spearheaded by a well-known professor at Harvard. (Hamblin, MR)
Although not finished with the book , (I did get the feeling in the beginning that if a small fraction of the claims are true, this therapy would be a medical miracle.)
I have just read the section that explains how red/near infrared light. at the prescribed frequencies, interacts with chlorophyll "metabolites" in the mitochondria and reduces oxidized CoQ10. (From the oxidized ubiquinone to the reduced ubiquinole.) The research showed that without the red light (or chlorophyll) none of the ubiquinone (CoQ10) was reduced! As the author suggests, this may be why eating greens is so important. Sunlight contains all light spectrums that have been found to provide unusual health benefits (e.g. blue, red/near infrared, and UV/B) the therapy makes the most sense during the winter, or for those who avoid sunlight.
Dietary chlorophyll metabolites catalyze the photoreduction of plasma ubiquinone
https://www.ncbi.nlm.nih.gov/pubmed/22928808
This is not the referenced study, but similar
Light-harvesting chlorophyll pigments enable mammalian mitochondria to capture photonic energy and produce ATP
http://jcs.biologists.org/content/127/2/388.short
Here is an overview:
Red and near infra-red signaling: Hypothesis and perspectives
https://www.sciencedirect.com/science/article/pii/S1389556712000032