Benefit of CoQ10 for heart function, blood pressure, and for cardiovascular conditions - Coenzyme Q10 is sold as 30 mg, 60 mg, and 100 mg. You can even find 200 mg and 300 pills, is there a risk of overdosing?
A nutrient of benefit as a good antioxidant and for heart tissue

CoQ10 is a powerful antioxidant which is of benefit for normal heart function and cellular energy production. Co Q10 is a nutritional supplement used around the world as a heart energizer. In some cases of heart problems, there is an associated deficiency. Like vitamins, it is a nutrient your body must take in to feed your cells so your body can operate at an optimum level. It is present in small amounts in food, notably seafood, and is produced by all cells of the body. Many heart failure patients use CoQ10 supplements in dosages ranging from 30 mg a day to 100 mg a day or more.
   Also called ubiquinone, it is a natural substance ewhich scavenges free radicals throughout the body. It works well with Vitamin E and other antioxidants.

CoQ10 - 50 mg, 60 capsules
Physician Formulas

You can learn more about CoQ10 and purchase at Physician Formulas web site.

Benefit for the human body
CoQ10 is a naturally occurring component present in living cells. Its physiological function is to act as an essential cofactor for ATP production, and to perform important antioxidant activities in the body. In most countries, It has been widely used as a dietary supplement for more than 30 years. Recently, the use of CoQ10 as a dietary supplement has grown with a corresponding increase in daily dosage. The published reports concerning safety studies indicate that CoQ10 has low toxicity and does not induce serious adverse effects in humans. Evidence from pharmacokinetic studies suggest that exogenous intake does not influence the biosynthesis of endogenous CoQ9 / CoQ10 nor does it accumulate into plasma or tissues after cessation of supplementation. Overall, these data from preclinical and clinical studies indicate that it is safe for use as a dietary supplement. Idebenone antioxidant health benefit and research studies. Lipoic acid can be used together but in low dosages.

Antioxidant
Which is more potent as an antioxidant, acetylcysteine or coq10?
   Probably acetylcysteine, but they are both helpful antioxidants.

Effect of smoking on levels
Concentrations of blood vitamin A, C, E, coenzyme Q10 and urine cotinine related to cigarette smoking exposure
Korean J Lab Med. 2009.
In smokers, smoking causes many disease entities including cancers, chronic pulmonary diseases and cardiovascular diseases. Passive smoking is also accepted as a carcinogen and its adverse health effects are emphasized. We measured blood vitamin A, C, E (alpha-, beta- and gamma-tocopherol), coenzyme Q10 and urine cotinine concentrations in nonsmokers and smokers. Twenty-one healthy nonsmokers and 24 healthy smokers were included in this study. Smoking status was assessed with a self-reported questionnaire. Plasma was analyzed for coenzyme Q10 and serum for vitamin A, C, E using HPLC (Agilent Technologies Inc.) and random urine for cotinine using LC/tandem mass spectrometry (Applied Biosystems Inc., Canada). Smokers had significantly lower serum concentrations of vitamin C than nonsmokers. No significant differences in concentrations of serum vitamin A, E, and plasma coenzyme Q10 were observed. Smokers had highly elevated urine cotinine levels. This study shows that smokers had significantly lower vitamin C levels among nonenzymatic antioxidants, namely, vitamin A, C, E and coenzyme Q10. High detection rate of urine cotinine in nonsmokers show the seriousness of passive smoking exposure, therefore more social efforts should be directed to reduce passive smoking exposure.