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  1. " I would assume it would work for nitric oxide" - is that really the case. As vitamin D and NO production are through entirely different mechanisms they could require very different UV wavelengths and intensities to produce them. Does anybody know of any research about NO production and characteristics of the UV required?
  2. 20% of people don't respond to exercise? Although all the studies showed people vary widely in their response: https://www.ncbi.nlm.nih.gov/pubmed/26767377 Found that 7% of people were "low responders" to muscle strength training of just 2 days a week. https://www.ncbi.nlm.nih.gov/pubmed/26854820 Found that over 20% people did not increase peak oxygen uptake after some studies on sprint interval training, "No nonresponders for peak oxygen uptake were observed in studies where participants trained 4 times per week" So while some people may have a week response and some may not train enough to have a response, that's a long way from 20% of people do not respond to exercise.