From my own looking around I would recommend adding CoQ10 if you are on statin anti-cholesterol medications. They interfere with its recycling within your body, and while there's a reason that the active part of CoQ10 is called 'ubiquinone' (its in EVERYTHING that was once alive) its plausible that levels might drop enough to mess with higher metabolic levels if you are on these drugs. Source: anecdotal evidence and a recent study that seemed to show that statin drugs cause people to stop getting cardiovascular benefits from aerobic exercise.