From a LEF magazine May 2008 The Most Important Tool for Disease Prevention:
Life Extension recommends that healthy adults over the age of 30 should strive to maintain coenzyme Q10 (CoQ10) blood levels that are consistently around 2.5 to 3 mcg/mL. Aging individuals with cardiovascular health concerns should strive for CoQ10 levels of at least 3.5 mcg/mL, while those with neurological disorders should seek CoQ10 blood levels around 7 mcg/mL.
Healthy people taking around 150 mg/day of the ubiquinol form of coenzyme Q10 (CoQ10) are attaining desired CoQ10 blood levels.
Ubiquinol is not cheap and I was taking only 50 mg of ubiquinol based on recommedations to take 50 mg or maximum 100 mg of CoQ10 (ubiquinon) a day. What do you think?