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J Med Food. 2011 Apr;14(4):386-90. doi: 10.1089/jmf.2010.1202. Epub 2011 Mar 3.

Effects of coenzyme Q10 on arterial stiffness, metabolic parameters, and fatigue in obese subjects: a double-blind randomized controlled study.

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Department of Family Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.


This study investigated the effects of coenzyme Q(10) supplementation on metabolic parameters, inflammatory markers, arterial stiffness, and fatigue in obese subjects. We performed a randomized, double-blind, placebo-controlled, single-center study on 51 obese subjects with a body mass index (BMI) of ≥25 kg/m(2). Subjects were randomized into either a coenzyme Q(10) (200 mg/day) group (n = 26, BMI = 27.9 ± 2.3 kg/m(2), age = 42.7 ± 11.3 years) or a placebo group (n = 25, BMI = 26.8 ± 2.8 kg/m(2), age = 41.3 ± 11.2 years) for a 12-week study. We collected anthropometric measurements, blood for laboratory testing, brachial-ankle pulse wave velocity (baPWV) as an indicator of arterial stiffness, and responses to a fatigue severity scale (FSS) questionnaire at the initial (0 week) and final (12 weeks) visits. A total of 36 subjects successfully completed the study protocol. Serum coenzyme Q(10) levels increased significantly from 0.65 ± 0.27 μg/mL to 1.20 ± 0.38 μg/mL in the coenzyme Q(10) group (P < .001). Oral administration of coenzyme Q(10) did not significantly affect lipid profiles, oxidative and inflammatory markers [including lipoprotein (a), oxidized low-density lipoprotein level, C-reactive protein, and white blood cell count], or baPWV. The mean FSS score decreased significantly from 40.1 to 33.1 in the coenzyme Q(10) group (P = .017), but no significant change was seen in the placebo group (P = .464). However, the extents of the change in mean FSS score between the placebo and coenzyme Q(10) groups were not significantly different (P = .287). In conclusion, we found no evidence that coenzyme Q(10) affects fatigue index, arterial stiffness, metabolic parameters, or inflammatory markers.

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