Effect on absorption and oxidative stress of different oral Coenzyme Q10 dosages and intake strategy in healthy men

Biofactors. 2005;25(1-4):219-24. doi: 10.1002/biof.5520250127.


Introduction: The effect of various dosages and dose strategies of oral coenzyme Q(10) (Q(100) administration on serum Q(10) concentration and bioequivalence of various formulations are not fully known.

Subjects and methods: In a randomized, double blind, placebo controlled trial 60 healthy men, aged 18-55 years, were supplemented with various dosages and dose strategies of coenzyme Q(10) soft oil capsules (Myoqinon 100 mg, Pharma Nord, Denmark) or crystalline 100 mg Q(10) powder capsules or placebo. After 20 days blood levels were compared and oxidative load parameters, malondialdehyde (MDA) and thiobarbituric acid reactive substances (TBARS) were monitored to evaluate bioequivalence. All the subjects were advised to take the capsules with meals. Blood samples were collected after 12 hours of overnight fasting at baseline and after 20 days of Q(10) administration. Compliance was evaluated by counting the number of capsules returned by the subjects after the trial.

Results: Compliance by capsule counting was >90%. Side effects were negligible. Serum concentrations of Q(10) (average for groups) increased significantly 3-10 fold in the intervention groups compared with the placebo group. Serum response was improved with a divided dose strategy. TBARS and MDA were in the normal ranges at baseline. After 20 days intervention in the 200 mg group TBARS and MDA decreased, but the decrease was only significant for MDA (Fig. 2).

Conclusions: All supplementations increased serum levels of Q(10). Q(10) dissolved in an oil matrix was more effective than the same amount of crystalline Q(10) in raising Q(10) serum levels. 200 mg of oil/soft gel formulation of Q(10) caused a larger increase in Q(10) serum levels than did 100 mg. Divided dosages (2 x 100 mg) of Q(10) caused a larger increase in serum levels of Q(10) than a single dose of 200 mg. Supplementation was associated with decreased oxidative stress as measured by MDA-levels. Indians appear to have low baseline serum coenzyme Q(10) levels which may be due to vegetarian diets. Further studies in larger number of subjects would be necessary to confirm our findings.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • Absorption
  • Adolescent
  • Adult
  • Biological Availability
  • Coenzymes
  • Humans
  • Male
  • Malondialdehyde / blood
  • Middle Aged
  • Oxidative Stress / physiology*
  • Solubility
  • Therapeutic Equivalency
  • Thiobarbituric Acid Reactive Substances / analysis
  • Ubiquinone / administration & dosage
  • Ubiquinone / analogs & derivatives*
  • Ubiquinone / blood


  • Coenzymes
  • Thiobarbituric Acid Reactive Substances
  • Ubiquinone
  • Malondialdehyde
  • coenzyme Q10