Michael: Don’t you mean Nitric Oxide as opposed to nitroglycerin? I’m no chemist but I thought the metabolically active ingredient in Beet Root was Nitric Oxide.
As with all supplementation, dietary manipulations or ergogenic aids I recommend you so a study on yourself to see if this effective. I’ve tried it with a number of athletes using acute dosing for races and no athlete who used it could tell a difference. I have never used it in a chronic long term training situation so that might be interesting.